期刊文献+
共找到1,102篇文章
< 1 2 56 >
每页显示 20 50 100
Stability evaluation method of large cross-section tunnel considering modification of thickness-span ratio in mechanized operation
1
作者 Junru Zhang Yumeng Liu Bo Yan 《Railway Sciences》 2023年第2期197-210,共14页
Purpose-This study aims to research the large cross-section tunnel stability evaluation method corrected after considering the thickness-span ratio.Design/methodology/approach-First,taking the Liuyuan Tunnel of Huangg... Purpose-This study aims to research the large cross-section tunnel stability evaluation method corrected after considering the thickness-span ratio.Design/methodology/approach-First,taking the Liuyuan Tunnel of Huanggang-Huangmei High-Speed Railway as an example and taking deflection of the third principal stress of the surrounding rock at a vault after tunnel excavation as the criterion,the critical buried depth of the large section tunnel was determined.Then,the strength reduction method was employed to calculate the tunnel safety factor under different rock classes and thickness-span ratios,and mathematical statistics was conducted to identify the relationships of the tunnel safety factor with the thickness-span ratio and the basic quality(BQ)index of the rock for different rock classes.Finally,the influences of thickness-span ratio,groundwater,initial stress of rock and structural attitude factors were considered to obtain the corrected BQ,based on which the stability of a large cross-section tunnel with a depth of more than 100 m during mechanized operation was analyzed.This evaluation method was then applied to Liuyuan Tunnel and Cimushan No.2 Tunnel of Chongqing Urban Expressway for verification.Findings-This study shows that under different rock classes,the tunnel safety factor is a strict power function of the thickness-span ratio,while a linear function of the BQ to some extent.It is more suitable to use the corrected BQ as a quantitative index to evaluate tunnel stability according to the actual conditions of the site.Originality/value-The existing industry standards do not consider the influence of buried depth and span in the evaluation of tunnel stability.The stability evaluation method of large section tunnel considering the correction of overburden span ratio proposed in this paper achieves higher accuracy for the stability evaluation of surrounding rock in a full or large-section mechanized excavation of double line high-speed railway tunnels. 展开更多
关键词 large cross-section tunnel Mechanized operation Tunnel stability Thickness-span ratio Basic quality index of rock Safety factor DEPTH SPAN
下载PDF
Anchorage performance of large-diameter FRP bolts and their application in large deformation roadway 被引量:2
2
作者 Jun Han Zuoqing Bi +2 位作者 Bing Liang Chen Cao Shuangwen Ma 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第8期1037-1043,共7页
In underground coal mines, fibre reinforced polymer(FRP) bolt is ideal for mined rib reinforcements as it can prevent gas explosions caused by shearer frictional spark. With increasing mining depth, small diameter FRP... In underground coal mines, fibre reinforced polymer(FRP) bolt is ideal for mined rib reinforcements as it can prevent gas explosions caused by shearer frictional spark. With increasing mining depth, small diameter FRP bolts used in shallow underground mining cannot fulfil the rib support requirements. Under the engineering background of deep underground shortwall mining in Wudong coal mine, this paper systematically studies Φ27 mm FRP bolt support for large deformation coal rib. Specimens with a fan-shaped cross-section were used to enable the tensile testing of the bolt rod, the measured average tensile strength of the studied FRP bolt was(486.1 ± 9.6) MPa with a maximum elongation of 5.7%±0.6%.The shear strength of the bolt was measured as approximately 258 MPa using a self-made double shear testing apparatus. Based on the equivalent radial stiffness principle, a laboratory short encapsulation pullout test(SEPT) method for rib bolting has been developed undertaken consideration of the mechanical properties of the coal seam. Results showed that the average peak anchorage forces of the Φ27 mm FRP bolt and Φ20 mm steel rebar bolt were 108.4 and 66.4 k N, respectively, which were agreed with the theoretical calculations and field measurements. Based on theoretical analysis of the loading states of the bolt under site conditions, bolting method of full-length resin grouting was adopted to offset the weaknesses of the FRP bolt. Numerical method was employed to compare the bolting effect using Φ27 mm FRP bolts and steel rebar bolts. Large diameter FRP bolting was determined as the optimum rib support scheme to increase the productivity of the coal mine and to enhance the ground control capability for+425 level mining roadways. This study provides the laboratory testing design and theoretical prediction of large diameter FRP bolts used for rib support in large deformation roadways. 展开更多
关键词 FRP bolt Laboratory SEPT Tensile strength Double shear testing Mined rib support large deformation roadway
下载PDF
Failure analysis and control technology of intersections of large‑scale variable cross‑section roadways in deep soft rock 被引量:6
3
作者 Shengrong Xie Yiyi Wu +3 位作者 Dongdong Chen Ruipeng Liu Xintao Han Qiucheng Ye 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第2期124-146,共23页
In deep underground mining,achieving stable support for roadways along with long service life is critical and the complex geological environment at such depths frequently presents a major challenge.Owing to the coupli... In deep underground mining,achieving stable support for roadways along with long service life is critical and the complex geological environment at such depths frequently presents a major challenge.Owing to the coupling action of multiple factors such as deep high stress,adjacent faults,cross-layer design,weak lithology,broken surrounding rock,variable cross-sections,wide sections up to 9.9 m,and clusters of nearby chambers,there was severe deformation and breakdown in the No.10 intersection of the roadway of large-scale variable cross-section at the−760 m level in a coal mine.As there are insufcient examples in engineering methods pertaining to the geological environment described above,the numerical calculation model was oversimplifed and support theory underdeveloped;therefore,it is imperative to develop an efective support system for the stability and sustenance of deep roadways.In this study,a quantitative analysis of the geological environment of the roadway through feld observations,borehole-scoping,and ground stress testing is carried out to establish the FLAC 3D variable cross-section crossing roadway model.This model is combined with the strain softening constitutive(surrounding rock)and Mohr–Coulomb constitutive(other deep rock formations)models to construct a compression arch mechanical model for deep soft rock,based on the quadratic parabolic Mohr criterion.An integrated control technology of bolting and grouting that is mainly composed of a high-strength hollow grouting cable bolt equipped with modifed cement grouting materials and a high-elongation cable bolt is developed by analyzing the strengthening properties of the surrounding rock before and after bolting,based on the Heok-Brown criterion.As a result of on-site practice,the following conclusions are drawn:(1)The plastic zone of the roof of the cross roadway is approximately 6 m deep in this environment,the tectonic stress is nearly 30 MPa,and the surrounding rock is severely fractured.(2)The deformation of the roadway progressively increases from small to large cross-sections,almost doubling at the largest cross-section.The plastic zone is concentrated at the top plate and shoulder and decreases progressively from the two sides to the bottom corner.The range of stress concentration at the sides of the intersection roadway close to the passageway is wider and higher.(3)The 7 m-thick reinforced compression arch constructed under the strengthening support scheme has a bearing capacity enhanced by 1.8 to 2.3 times and increase in thickness of the bearing structure by 1.76 times as compared to the original scheme.(4)The increase in the mechanical parameters c andφof the surrounding rock after anchoring causes a signifcant increase inσt;the pulling force of the cable bolt beneath the new grouting material is more than twice that of ordinary cement grout,and according to the test,the supporting stress feld shows that the 7.24 m surrounding rock is compacted and strengthened in addition to providing a strong foundation for the bolt(cable).On-site monitoring shows that the 60-days convergence is less than 30 mm,indicating that the stability control of the roadway is successful. 展开更多
关键词 Deep soft rock Variable cross-section roadway intersection Bolting-grouting integration New grouting material
下载PDF
Dynamic caustics test of blast load impact on neighboring different cross-section roadways 被引量:6
4
作者 Guo Dongming Zhou Baowei +2 位作者 Liu Kang Yang Renshu Yan Pengyang 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期803-808,共6页
Using digital laser dynamic caustics experimental system and conducting simulation experiment researched the influence rule of blasting excavation of a new roadway on neighboring existed different cross-section roadwa... Using digital laser dynamic caustics experimental system and conducting simulation experiment researched the influence rule of blasting excavation of a new roadway on neighboring existed different cross-section roadways. The experimental results show that the influence of blast load on adjacent roadway has a good relationship with the cross-section of roadway. The expansion distance of precrack existed in circular, arch-wall, rectangular roadway is respectively 1.76, 1.61 and 0 cm under blast load.At the same time, the direct-blast side of rectangular roadway has more obvious damage compared with circular and arch-wall roadway. It explains that plane reflects more stress wave than arc, so that it exerts more tensile failure in the direct-blast side, which leads to less stress wave diffracting to the precrack in the back-blast side. When the precrack extends, higher value dynamic stress intensity factor in circular roadway works longer than that of arch-wall roadway. Indirectly, it explains that plane's weakening function on stress wave is significantly stronger than arc. Stress wave brings about self-evident influence on the upper and bottom endpoints of the rectangular roadway, and it respectively extends 1.03, 2.06 cm along the line link direction of the center of the blasthole and the upper and bottom endpoints on the right wall. 展开更多
关键词 Dynamic caustics Blast load Different cross-section roadways Precrack Dynamic stress intensity factor
下载PDF
High prestress truss cable support principle and its application in large cross section coal roadway 被引量:1
5
作者 姚精明 何富连 萧潇 《Journal of Coal Science & Engineering(China)》 2007年第1期18-21,共4页
With the enlarge of cross section of roadway, the radius of plastic area and broken area increase, and the tensile stress and shear stress distributing in roof coal-rock layers relevantly increase, which induce suppor... With the enlarge of cross section of roadway, the radius of plastic area and broken area increase, and the tensile stress and shear stress distributing in roof coal-rock layers relevantly increase, which induce support effect not obvious for ordinary bolt(cable). While bounding point and support structure of the truss cable is in vertex angle of roadway, and supplies coal-rock layers in bounding area with the horizontal and vertical pressure, so it settles the support problems in large cross section coal roadway. From the point of view of mechanics, gave emphasis on the invalid mechanics of ordinary bolt (cable) in large cross section coal roadway and supported mechanics of prestress truss cable. The author successfully used this technique in Wuyang Mine, and had the huge economic efficiency and the social benefit. 展开更多
关键词 truss cable large cross section roadway ordinary bolt (cable) PRESTRESS
下载PDF
Failure mechanism and safety control technology of a composite strata roadway in deep and soft rock masses:a case study
6
作者 ZHAO Chengwei ZHOU Hui +3 位作者 SUN Xiaoming ZHANG Yong MIAO Chengyu WANG Jian 《Journal of Mountain Science》 SCIE CSCD 2024年第7期2427-2444,共18页
The construction of coal mines often encounters deep composite soft rock roadways,which is characterized by significant deformation and poor stability.To deeply study the failure mechanism and large deformation challe... The construction of coal mines often encounters deep composite soft rock roadways,which is characterized by significant deformation and poor stability.To deeply study the failure mechanism and large deformation challenges of a composite strata roadway in deep and soft rock masses,a numerical model of 3DEC tetrahedral blocks was established based on the method of rock quality designation(RQD).The results showed that original support cannot prevent asymmetric failure and large deformation due to the adverse geological environment and unsuitable support design.According to the failure characteristics,a coupling support of“NPR bolt/cable+mesh+shotcrete+steel pipe”was proposed to control the stability of the surrounding rock.The excellent mechanical properties of large deformation(approximately 400 mm)and high constant resistance force(bolt with 180 k N;cable with 350 k N)were evaluated by the tensile tests.The numerical results showed that the maximum deformation was minimized to 243 mm,and the bearing capacity of the surrounding rock of the roadway was enhanced.The field test results showed that the maximum deformation of the surrounding rock was 210 mm,and the forces of the NPR bolt and cable were stable at approximately 180 k N and 350 k N,respectively.This demonstrated the effectiveness of the coupling support with the NPR bolt and cable,which could be a guiding significance for the safety control of large deformation and failure in deep composite soft rock roadways. 展开更多
关键词 3DEC Composite strata roadway Soft rock NPR bolt and cable Asymmetric large deformation
原文传递
Key technologies and equipment for a fully mechanized top-coal caving operation with a large mining height at ultra-thick coal seams 被引量:61
7
作者 Jinhua Wang Bin Yu +4 位作者 Hongpu Kang Guofa Wang Debing Mao Yuntao Liang Pengfei Jiang 《International Journal of Coal Science & Technology》 EI 2015年第2期97-162,共66页
Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which accounts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mi... Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which accounts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were extensively used in China. However, for coal seams with thickness greater than 14 m, there have been no reported cases in the world for underground mechanical extraction with safe performance, high efficiency and high coal recovery ratio. To deal with this case, China Coal Technology & Engineering Group, Datong Coal Mine Group, and other 15 organizations in China launched a fundamental and big project to develop coal mining technologies and equipment for coal seams with thicknesses greater than 14 m. After the completion of the project, a coal extraction method was developed for top-coal caving with a large mining height, as well as a ground control theory for ultra-thick coal seams. In addition, the mining technology for top-coal caving with a large mining height, the ground support technology for roadway in coal seams with a large cross-section, and the prevention and control technology for gas and fire hazards were developed and applied. Furthermore, a hydraulic support with a mining height of 5.2 m, a shearer with high reliability, and auxiliary equipment were developed and manufactured. Practical implication on the technologies and equipment developed was successfully completed at the No. 8105 coal face in the Tashan coal mine, Datong, China. The major achievements of the project are summarized as follows: 1. A top-coal caving method for ultra-thick coal seams is proposed with a cutting height of 5 m and a top-coal caving height of 15 m. A structural mechanical model of overlying strata called cantilever beam-articulated rock beam is established. Based on the model, the load resistance of the hydraulic support with a large mining height for top-coal caving method is determined. With the analysis, the movement characteristics of the top coal and above strata are evaluated during top-coal caving operation at the coal face with a large mining height. Furthermore, there is successful development of comprehensive technologies for preventing and controlling spalling of the coal wall, and the top-coal caving technology with high efficiency and high recovery at the top-coal caving face with a large mining height. This means that the technologies developed have overcome the difficulties in strata control, top-coal caving with high efficiency and high coal recovery, and enabled to achieve a production rate of more than 10 Mtpa at a single top-coal caving face with a large mining height in ultra-thick coal seams; 2. A hydraulic support with 5.2 m supporting height and anti-rockburst capacity, a shearer with high reliability, a scraper conveyor with a large power at the back of face, and a large load and long distance headgate belt conveyor have been successfully developed for a top-coal caving face with large mining height. The study has developed the key technologies for improving the reliability of equipment at the coal face and has overcome the challenges in equipping the top-coal caving face with a large mining height in ultra-thick coal seams; 3. The deformation characteristics of a large cross-section roadway in ultra-thick coal seams are discovered. Based on the findings above, a series of bolt materials with a high yielding strength of 500-830 MPa and a high extension ratio, and cable bolt material with a 1 × 19 structure, large tonnage and high extension ratio are developed. In addition, in order to achieve a safe roadway and a fast face advance, installation equipment for high pre-tension bolt is developed to solve the problems with the support of roadway in coal seams for top-coal caving operation with a large mining height; 4. The characteristics of gas distribution and uneven emission at top-coal caving face with large mining height in ultra-thick coal seams are evaluated. With the application of the technologies of gas drainage in the roof, the difficulties in gas control for high intensive top-coal caving mining operations, known as "low gas content, high gas emission", are solved. In addition, large flow-rate underground mobile equipment for making nitrogen are developed to solve the problems with fire prevention and safe mining at a top-coal caving face with large mining height and production rate of more than 10 Mtpa. A case study to apply the developed technologies has been conducted at the No. 8105 face, the Tashan coal mine in Datong, China. The case study demonstrates that the three units of equipment, i.e., the support, shearer and scraper conveyor, are rationally equipped. Average equipment usage at the coal face is 92.1%. The coal recovery ratio at the coal face is up to 88.9 %. In 2011, the coal production at the No. 8105 face reached 10.849 Mtpa, exceeding the target of 10 Mtpa for a topcoal caving operation with large mining height performed by Chinese-made mining equipment. The technologies and equipment developed provide a way for extracting ultra-thick coal seams. Currently, the technologies and equipment are used in 13 mining areas in China including Datong, Pingshuo, Shendong and Xinjiang. With the exploitation of coal resources in Western China, there is great potential for the application of the technologies and equipment developed. 展开更多
关键词 Ultra-thick coal seams Top-coal caving mining large mining height Mining method - Mining equipment roadway support Safety guarantee
下载PDF
Mechanism and practice of rock control in deep large span cut holes 被引量:2
8
作者 Li Chong Xu Jinhai +2 位作者 Fu Chunsheng Wu Rui Ma Qianqian 《Mining Science and Technology》 EI CAS 2011年第6期891-896,共6页
Deep large span cut holes are difficult to stabilize. The 7801 cut hole in the Lu'an Wuyang Mine was used as this project's background. The main factors affecting large span cut hole stability are analyzed. Pr... Deep large span cut holes are difficult to stabilize. The 7801 cut hole in the Lu'an Wuyang Mine was used as this project's background. The main factors affecting large span cut hole stability are analyzed. Pre- stressed bolting theory was used to design a roof control method for a large span roadway. By reducing the span and applying equal strength coordinated supports the rock could be stabilized. The control prin- ciples and methods are given herein along with the analysis. A double micro arch cross section roadway is defined and its use in solving the current problem is described. Beam arch theory was used to build a model of the double micro arch cross section roadway. A support reverse force model for the arch foot intersection was also derived. A support method based upon reducing the width of the large span in the cut hole is presented. These results show that the reduced span of the roadway roof plus the use of cable anchors and single supports gives an effective way to control the large span cut hole. On site monitoring showed that the reduced span support from the double micro arch cross section roadway design had a significant effect. The roadway surface displacement was small and harmful deformation of the cut hole was effectively controlled. This will ensure its long term stability. 展开更多
关键词 Deep large span cut hole Double micro arch cross-section roadway Roof control by cross cut Equal strength coordinated support
下载PDF
CFD-Based Numerical Analysis of a Variable Cross-Section Cylinder 被引量:1
9
作者 DUAN Jinlong HUANG Weiping 《Journal of Ocean University of China》 SCIE CAS 2014年第4期584-588,共5页
Using ANSYS-CFX, a general purpose fluid dynamics program, the vortex-induced vibration(VIV) of a variable cross-section cylinder is simulated under uniform current with high Reynolds numbers. Large eddy simulation(LE... Using ANSYS-CFX, a general purpose fluid dynamics program, the vortex-induced vibration(VIV) of a variable cross-section cylinder is simulated under uniform current with high Reynolds numbers. Large eddy simulation(LES) is conducted for studying the fluid-structure interaction. The vortex shedding in the wake, the motion trajectories of a cylinder, the variation of drag and lift forces on the cylinder are analyzed. The results show that the vortices of variable cross-section cylinder are chaotic and are varying along the cylinder. In places where cross-sections are changing significantly, the vortices are more irregular. The motion trail of the cylinder is almost the same but irregular. The drag and lift coefficients of the cylinder are varying with the changes of diameters. 展开更多
关键词 variable cross-section cylinder large eddy simulation fluid-solid interaction drag coefficient lift coefficient vortex shedding
下载PDF
新景矿大断面岩巷综掘技术研究与应用 被引量:1
10
作者 邓鹏 《煤炭与化工》 CAS 2024年第4期10-13,共4页
为提高掘进速度,保证巷道稳定,在新景矿15号煤采区集中辅助运输巷开展了大断面岩巷综合机械化掘进技术的研究。在分析当前施工工艺以及支护中存在问题的基础上,提出了以EBZ320D掘进机和CMM2-25型锚杆钻机为主要设备的综合机械化岩巷掘... 为提高掘进速度,保证巷道稳定,在新景矿15号煤采区集中辅助运输巷开展了大断面岩巷综合机械化掘进技术的研究。在分析当前施工工艺以及支护中存在问题的基础上,提出了以EBZ320D掘进机和CMM2-25型锚杆钻机为主要设备的综合机械化岩巷掘进作业线。理论分析了锚杆索围岩强度强化理论,结合现场实际情况,设计了以不同长度锚索为主的支护方式。现场应用表明,应用新的综合机械化掘进技术后,巷道变形量小,掘进速度快,施工成本低,经济社会效益显著,应用效果良好。 展开更多
关键词 岩石巷道 大断面 巷道综掘 矿压观测
下载PDF
面间煤柱与顺槽“掘-充-留”一体化科学问题与技术
11
作者 王双明 刘浪 +7 位作者 朱梦博 蔚保宁 庄登登 屈慧升 何伟 邵成成 夏磊 周静 《煤炭学报》 EI CAS CSCD 北大核心 2024年第8期3291-3315,共25页
我国将煤炭作为兜底保障能源的局面短期内无法改变,仍将长时间面临煤炭资源保护与煤基固废利用率低的难题。通过创新采掘方法,同时实现提高煤炭资源回采率、规模化处置煤基固废,为煤炭行业绿色可持续发展提供了新途径。在深入调研煤炭... 我国将煤炭作为兜底保障能源的局面短期内无法改变,仍将长时间面临煤炭资源保护与煤基固废利用率低的难题。通过创新采掘方法,同时实现提高煤炭资源回采率、规模化处置煤基固废,为煤炭行业绿色可持续发展提供了新途径。在深入调研煤炭资源开采技术发展现状的基础上,提出了煤矿“掘-充-留”掘进新工法。从大断面巷道快速掘进、连续高效充填和巷道安全留设3个方面,通过理论分析、数值模拟等手段,系统论述了“掘-充-留”工法的科学问题和关键技术,研究结果表明:①针对大断面巷道快速掘进、掘进工作面围岩稳定性控制等工程难题,凝练了煤岩特性与掘进机截割参数匹配机制、覆岩载荷空间传递机制与围岩变形机理、锚杆/索-顶板相互作用关系及支护机制3个科学难题,构建了以掘进区地质环境超前实时感知、落-装-运煤多工序智能协同作业、钻锚支架随掘随支围岩时效控制和大断面巷道防漏风及通风优化为核心的技术体系;②从大断面巷道承载体系及时构建及其承载性能调控两个方面凝练了连续高效充填的科学问题,包括充填体-煤层-锚杆/索协同承载机制、多元固废基充填材料水化固结机制,明晰充填体物理力学特性时空演化规律,建立了充填空间安全高效搭建、充填材料工作性能调控、充填材料流动-固结感知为核心的连续高效充填关键技术体系,相关理论与技术的突破可以为充填材料的原材料优选及配比设计、添加剂开发/选型及工作性能调控、掘进速率及充填步距优化设计、充填体固结监测等提供基础理论依据;③基于巷道安全留设及全生命周期内围岩易断裂、易片帮和易损伤等关键难题,阐述了巷道围岩应力场时空分布特征、巷道变形与损伤演化机制、巷道围岩工程质量监测与稳定性调控理论3个科学问题,形成了以巷道围岩稳定性智能预警、巷道围岩变形控制为核心的关键技术体系。开展煤矿“掘-充-留”工法的科学研究与工程示范,实现固废规模化处置-面间煤柱高效回收-顺槽快速掘进的协同,可以推动煤炭行业绿色低碳转型发展。 展开更多
关键词 煤基固废 面间煤柱 大断面掘巷 连续充填 巷道留设 “掘-充-留”工法 稳定性监测
下载PDF
复合扩管式锚索恒阻器的研发与试验研究
12
作者 贾后省 张志明 +4 位作者 刘少伟 王林 江文渊 彭博 付孟雄 《煤炭学报》 EI CAS CSCD 北大核心 2024年第6期2604-2614,共11页
深部高应力、软弱围岩、强烈采动影响等条件下的巷道围岩频繁出现大变形,此类围岩大变形支护可控性普遍较差,常规锚索因其较低的延伸率无法适应巷道大变形而大量破断或锚固失效,导致巷道出现冒顶隐患。针对此类问题,研发了一种与常规锚... 深部高应力、软弱围岩、强烈采动影响等条件下的巷道围岩频繁出现大变形,此类围岩大变形支护可控性普遍较差,常规锚索因其较低的延伸率无法适应巷道大变形而大量破断或锚固失效,导致巷道出现冒顶隐患。针对此类问题,研发了一种与常规锚索配合使用的复合扩管式恒阻器,其结构主要由止进端盖、扩径管、一体式托盘和锥式锁具组成,通过锥式锁具克服扩径管“扩胀—摩削”所产生的近似恒定的复合阻力,实现围岩大变形过程中的锚索支护阻力恒定,通过理论分析、数值模拟和静力拉伸试验等综合研究方法,系统分析和试验了复合扩管式恒阻器的力学特性和工作稳定性,掌握了该恒阻器扩径增量、锁具锥角对扩径管变形及恒阻器复合阻力的影响规律。试验结果表明:恒阻器复合阻力主要分为阻力快升段和近恒定阻力段2个过程,且近恒定阻力段作为主要阶段达到试验全程的85%~90%;锁具锥角、扩径增量直接影响了扩径管变形及恒阻器力学特性,锁具锥角小于20°时,扩径管变形均匀且恒阻器复合阻力发挥稳定,而扩径增量则决定了恒阻器复合阻力的大小,可通过调整扩径增量获取需要的锚索恒阻力;Ф17.8 mm锚索条件下,当锁具锥角为15°、扩径增量为5 mm时,恒阻器恒定阻力约为265.92 kN,Ф21.8 mm锚索条件下,当锁具锥角为15°,扩径增量为8 mm时,恒阻器恒定阻力约为424.15 kN,且工作状态稳定可靠,可较好的符合大变形巷道的恒阻支护要求。此外,该恒阻器还具有工作稳定性强、恒阻行程及阻力可调、结构简单、安装便捷等特点,是大变形巷道围岩控制技术的有效补充。 展开更多
关键词 大变形巷道 复合扩管 锚索恒阻 拉伸试验
下载PDF
大倾角煤层抗剪锚杆设计与测试
13
作者 丁小敏 董昊福 +4 位作者 张玮 付慧见 刘冬亮 徐宝龙 刘玉德 《煤矿机械》 2024年第2期8-11,共4页
为了减少大倾角煤层斜梯形巷道变形破坏,设计了新型抗剪锚杆,分析了锚杆工作原理及锚杆参数。以东峡煤矿为工程背景,采用物理模拟、数值模拟和现场监测相结合的研究方法,对大倾角斜梯形巷道抗剪锚杆支护进行了研究。结果表明,在加载中,... 为了减少大倾角煤层斜梯形巷道变形破坏,设计了新型抗剪锚杆,分析了锚杆工作原理及锚杆参数。以东峡煤矿为工程背景,采用物理模拟、数值模拟和现场监测相结合的研究方法,对大倾角斜梯形巷道抗剪锚杆支护进行了研究。结果表明,在加载中,原支护模型在4.9 MPa即发生破坏,而抗剪锚杆支护模型在7 MPa发生破坏,原支护试验顶板下沉量较大,其变形量及变形速度远大于抗剪锚杆支护试验;抗剪锚杆能有效控制巷道顶板离层,离层量为21~129 mm,抗剪锚杆能够承受的极限破断载荷为155 kN,能有效控制深部围岩的变形。 展开更多
关键词 大倾角巷道 巷道支护 物理模拟 数值模拟 现场监测
原文传递
区段煤柱下大断面回采巷道不同成巷方式分析研究
14
作者 王兵建 刘煜成 +1 位作者 魏宏奎 王亚斌 《煤炭技术》 CAS 2024年第1期80-84,共5页
为了探究在区段煤柱下大断面巷道在掘进时受到扰动最小的一种成巷方式,以乌兰色太煤矿掘进52202工作面运输顺槽为研究背景,针对该工作面实际地质资料,通过数值模拟分析了大断面巷道在不同成巷方式条件下的塑性区形态、应力场及位移场分... 为了探究在区段煤柱下大断面巷道在掘进时受到扰动最小的一种成巷方式,以乌兰色太煤矿掘进52202工作面运输顺槽为研究背景,针对该工作面实际地质资料,通过数值模拟分析了大断面巷道在不同成巷方式条件下的塑性区形态、应力场及位移场分布规律。结果表明,先掘进5.4 m宽正常巷道,后扩帮2 m的成巷方式为最优成巷方式,将其应用于工程实践,为同类型区段煤柱下大断面巷道提供参考依据。 展开更多
关键词 区段煤柱 大断面 回采巷道 不同成巷方式 数值模拟
原文传递
矿井采煤过程中大断面巷道支护技术研究
15
作者 王强 《能源与节能》 2024年第4期178-180,184,共4页
煤炭资源是中国重要的能源资源之一,然而在矿井采煤过程中,巨大煤矿的开采和应力变化等因素导致支护不足和大断面巷道变形严重。为了解决这一问题,需要开展更深入、更系统的研究。首先介绍了大断面巷道的特点以及在采煤过程中存在的支... 煤炭资源是中国重要的能源资源之一,然而在矿井采煤过程中,巨大煤矿的开采和应力变化等因素导致支护不足和大断面巷道变形严重。为了解决这一问题,需要开展更深入、更系统的研究。首先介绍了大断面巷道的特点以及在采煤过程中存在的支护难题,包括巷道变形、支架开裂等问题。然后分析了传统支护方式存在的不足之处,并提出了一种新型支护技术——填充式支护技术。该技术采用填充材料将巷道周围空隙填满,从而增强了支护效果,提高了大断面巷道开采的安全性和可靠性。 展开更多
关键词 矿井采煤 大断面巷道 支护技术
下载PDF
大断面半煤岩巷道变形破坏机理研究及控制技术 被引量:1
16
作者 席义苗 程利兴 +2 位作者 张东昕 汪占领 石蒙 《煤炭工程》 北大核心 2024年第2期52-58,共7页
针对大断面半煤岩巷道围岩变形控制难题,以小保当煤矿一号井大断面半煤岩巷道为研究背景,测试了巷道围岩岩层分布、围岩地应力分布及裂隙发育,分析了巷道围岩的变形破坏演化特征。通过实验室试验以及数值模拟分析了半煤岩组合体力学性... 针对大断面半煤岩巷道围岩变形控制难题,以小保当煤矿一号井大断面半煤岩巷道为研究背景,测试了巷道围岩岩层分布、围岩地应力分布及裂隙发育,分析了巷道围岩的变形破坏演化特征。通过实验室试验以及数值模拟分析了半煤岩组合体力学性能及其变形破坏形态,揭示了强度较低的煤体最先在煤岩交界面发生破裂、滑移,变形不断向深部延伸,随着煤岩体完整性及强度的持续弱化,造成巷帮由下而上的非均匀渐进性失稳破坏,揭示了提高大断面半煤岩巷道围岩稳定性的关键在于控制煤岩交界面非协调变形。基于此提出了采用高预应力锚杆支护与薄弱区域加强支护的变形控制思路,制定了小保当一号井大断面巷道半煤岩巷道围岩变形控制方案,并开展了井下工业试验,取得了较好的应用效果,在监测期内巷道顶板的位移量为28 mm,两帮的位移量为80 mm,底板的位移量为43 mm,随后围岩变形趋于稳定,巷帮煤岩交界处的变形控制效果显著,表明采用该方案可有效控制大断面半煤岩巷围岩变形。 展开更多
关键词 大断面巷道 半煤岩巷道 高预应力支护 煤岩组合体
下载PDF
深部特厚煤层综放沿空掘巷煤柱优化及巷道支护 被引量:1
17
作者 彭林军 吴家遥 +3 位作者 何满潮 宫凯旋 陈东旭 徐顺钰 《西安科技大学学报》 CAS 北大核心 2024年第3期563-574,共12页
为研究深部大采高综放工作面窄煤柱沿空掘巷巷道矿压控制问题,以国能宁煤集团枣泉煤矿2^(-2)特厚煤层130203大采高综放工作面回风巷道为背景,基于实用矿山压力理论,建立了巷道围岩内、外应力场动态结构力学模型,运用理论计算和数值计算... 为研究深部大采高综放工作面窄煤柱沿空掘巷巷道矿压控制问题,以国能宁煤集团枣泉煤矿2^(-2)特厚煤层130203大采高综放工作面回风巷道为背景,基于实用矿山压力理论,建立了巷道围岩内、外应力场动态结构力学模型,运用理论计算和数值计算针对不同尺寸煤柱煤体应力对比分析,将原留设15 m护巷煤柱缩小至5 m进行了煤柱优化。结果表明:在稳定的内应力场掘巷有利于巷道的稳定性,避免了顶板事故及冲击地压相关灾害的发生,现场5 m小煤柱护巷工程应用中,130203回风巷道小煤柱侧变形量为1050 mm,实体煤帮变形量为400 mm,两帮呈现不对称性变形,底板局部底鼓量为1400 mm;深部特厚煤层综放开采沿空掘巷采用5 m小煤柱护巷方案设计正确,极大改善了巷道围岩的应力环境,整体设计满足生产要求,现场应用良好。130203工作面小煤柱沿空掘巷技术成功应用,为矿井开采提供了可靠的科学依据。 展开更多
关键词 深部特厚煤层 大采高综放开采 沿空巷道 煤柱优化 巷道支护
下载PDF
厚煤层大断面沿空巷道变形破坏机理及控制技术 被引量:3
18
作者 王海亮 任冬冬 +2 位作者 韩卫栋 黄小虎 马腾 《建井技术》 2024年第2期78-83,94,共7页
针对沿空巷道受多次采动叠加影响极易发生变形失稳破坏的难题,以某矿1505W工作面厚煤层综放开采工作面为研究背景,综合采用理论分析、现场实测、数值模拟等多种研究方法探讨分析了沿空巷道围岩失稳破坏机制,并提出了围岩“浅部、深部、... 针对沿空巷道受多次采动叠加影响极易发生变形失稳破坏的难题,以某矿1505W工作面厚煤层综放开采工作面为研究背景,综合采用理论分析、现场实测、数值模拟等多种研究方法探讨分析了沿空巷道围岩失稳破坏机制,并提出了围岩“浅部、深部、表层”控制方案。现场试验结果表明,提出的控制方案能够使巷道浅、深部围岩形成统一的整体,有效抑制了沿空巷道围岩变形,提高了巷道的稳定性。 展开更多
关键词 厚煤层 大断面 沿空巷道 围岩变形 支护优化
下载PDF
高应力大断面巷道围岩注浆加固机理及其应用 被引量:3
19
作者 王树明 冯友良 《中国矿业》 北大核心 2024年第4期209-216,共8页
为解决高应力大断面巷道服务期间变形严重的问题,利用莫尔-库仑准则和力学平衡原理,开展巷道松动圈注浆加固机理和力学模型分析,采用FLAC3D仿真计算软件对4种不同支护形式进行数值模拟,研究不同支护状态下巷道变形演化规律,并开展现场... 为解决高应力大断面巷道服务期间变形严重的问题,利用莫尔-库仑准则和力学平衡原理,开展巷道松动圈注浆加固机理和力学模型分析,采用FLAC3D仿真计算软件对4种不同支护形式进行数值模拟,研究不同支护状态下巷道变形演化规律,并开展现场工程实践。研究结果表明:增加承载层的长度可以有效提高巷道围岩的稳定性,注浆加固可黏合破碎岩体,形成骨架结构;分层掘进可减小巷道围岩自由面,从而减缓应力释放速度;滞后注浆可在应力基本释放后对破碎岩体进行最大程度的黏合加固,加固后的松动圈形成整体结构后配合锚杆索支护,能够有效减少围岩破坏以及塑性区发育。实践证明:采用“分层掘进+滞后注浆+锚索补强”支护方案后,掘进期间,顶底板最大移近量约为50 mm,两帮最大移近量约为140 mm,底鼓量约为75 mm;5303工作面回采期间,顶底板最大移近量约为125 mm,两帮最大移近量约为350 mm,底鼓量约为173 mm,虽然回采期间巷道变形量较大,但整体变形可控,能满足深部大断面巷道支护要求。“分层掘进+滞后注浆+锚索补强”支护方案能够有效解决高应力大断面巷道严重变形问题,可在类似地质条件的矿井推广。 展开更多
关键词 高应力 大断面巷道 松动圈 分层掘进 滞后注浆 矿压观测
下载PDF
新上海一号煤矿软岩回采巷道预裂卸压技术研究
20
作者 刘光饶 张勇 +9 位作者 左海峰 耿东坤 杨位良 何晓青 刘建荣 宋杰 翟军存 张传伟 孙毅 王传峰 《煤炭技术》 CAS 2024年第4期18-22,共5页
基于新上海一号煤矿软岩巷道支护薄弱的特点,提出了一种新的预裂卸压技术,旨在解决软岩巷道围岩大变形控制难题。该技术主要采用超前预裂卸压为主、NPR锚索协同支护为辅的方式,通过预裂卸压切断采空区顶板与巷道顶板之间的联系,加速顶... 基于新上海一号煤矿软岩巷道支护薄弱的特点,提出了一种新的预裂卸压技术,旨在解决软岩巷道围岩大变形控制难题。该技术主要采用超前预裂卸压为主、NPR锚索协同支护为辅的方式,通过预裂卸压切断采空区顶板与巷道顶板之间的联系,加速顶板垮断,减小悬臂长度及传递至临空巷道顶板的覆岩荷载。同时,采用NPR锚索提前对巷道进行补强加固,确保了沿空巷道在超前应力影响下的稳定性。实地应用表明,采用预裂卸压技术回采巷道围岩变形量得到有效控制,验证了预裂卸压技术的有效性。为软岩巷道稳定性控制提供了一种新的解决方案。 展开更多
关键词 软岩巷道 大变形 预裂卸压 协同支护 稳定性控制
原文传递
上一页 1 2 56 下一页 到第
使用帮助 返回顶部