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大断面隧道塌方机理与安全性控制研究
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作者 李志军 《云南水力发电》 2024年第1期179-181,共3页
隧道工程在现代城市建设中起到了至关重要的作用。大断面隧道因其具备较高的通行能力以及良好的通风条件,被广泛应用于城市地下交通、水利工程等领域。然而,随着隧道工程规模的不断扩大,大断面隧道的安全问题也逐渐引起了人们的关注。... 隧道工程在现代城市建设中起到了至关重要的作用。大断面隧道因其具备较高的通行能力以及良好的通风条件,被广泛应用于城市地下交通、水利工程等领域。然而,随着隧道工程规模的不断扩大,大断面隧道的安全问题也逐渐引起了人们的关注。隧道塌方作为大断面隧道工程中的一种常见事故类型,一旦发生,往往会导致严重的人员伤亡和财产损失。因此,深入研究大断面隧道塌方的机理以及相应的安全性控制措施显得尤为重要。 展开更多
关键词 大断面隧道塌方 隧道塌方机理 安全性控制 稳定性
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软岩隧道底鼓变形机理及防治措施综述 被引量:7
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作者 屈小七 孟陆波 《人民长江》 北大核心 2019年第S02期143-148,215,共7页
隧道底鼓是隧道围岩与仰拱发生变形和破坏的主要表现形式,是在软岩地质环境中常见的一种隧道地质灾害。根据软岩隧道底鼓研究成果,系统总结了底鼓机理、底鼓量的计算、底鼓防治措施。将底鼓成因分为三大类:物理因素、力学因素、岩体结... 隧道底鼓是隧道围岩与仰拱发生变形和破坏的主要表现形式,是在软岩地质环境中常见的一种隧道地质灾害。根据软岩隧道底鼓研究成果,系统总结了底鼓机理、底鼓量的计算、底鼓防治措施。将底鼓成因分为三大类:物理因素、力学因素、岩体结构因素。提出三个隧道底鼓机理研究方向:循环荷载、洞室尺寸和形状、开挖方法。罗列了5种原因引起的底鼓量的计算公式,可根据实际工程底鼓机理进行组合叠加得到总的底鼓量表达式。针对隧道底鼓的防治,将防治措施分为三大类:传统措施、耦合措施、特殊措施,并且列举了每一种措施相应的实际工程案例。统计工程案例后发现,锚注支护是控制底鼓使用最普遍的一种手段。最后提出了现今隧道底鼓研究中存在的问题和未来的发展方向。 展开更多
关键词 隧道底鼓机理 隧道工程 底鼓量预测 锚注支护
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富水软弱围岩隧道塌方机理及治理技术研究 被引量:15
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作者 张龙生 翁贤杰 《中外公路》 北大核心 2017年第1期173-179,共7页
隧道施工穿越富水软弱围岩时常发生塌方地质灾害,给工程建设带来困难。该文依托江西省昌宁高速公路莲花山隧道塌方实例,运用多物理场耦合模拟软件对典型断面进行流固耦合数值计算,定量分析了富水软弱围岩隧道塌方过程中围岩和支护结构... 隧道施工穿越富水软弱围岩时常发生塌方地质灾害,给工程建设带来困难。该文依托江西省昌宁高速公路莲花山隧道塌方实例,运用多物理场耦合模拟软件对典型断面进行流固耦合数值计算,定量分析了富水软弱围岩隧道塌方过程中围岩和支护结构的应力、位移以及渗流场响应特征,研究了塌方发生机理。基于稳固处治原则,采取了包含塌体稳固、塌方影响段加固、塌方情况物理探测、管棚支护参数设计、塌方段洞内管棚注浆支护、短开挖强支护的综合治理技术措施。围岩变形监测结果表明:塌方处治效果较好。 展开更多
关键词 富水软弱围岩 流固耦合数值模拟 隧道塌方机理 地质雷达探测 管棚注浆
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双链DNA分子内电荷转移超交换机理 被引量:2
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作者 徐四川 艾希成 +3 位作者 冯娟 张汝波 张启元 张兴康 《物理化学学报》 SCIE CAS CSCD 北大核心 2002年第7期640-643,共4页
设计并合成了一系列寡聚核苷酸组成的双链DNA分子,通过检测样品中二氨基嘌呤(Ap)荧光峰强度和相对荧光量子产率来研究DNA分子内电荷转移.实验中直接分辨和观测到双链DNA分子内电荷转移超交换机理,超交换机理在近距离起作用;而电荷转移... 设计并合成了一系列寡聚核苷酸组成的双链DNA分子,通过检测样品中二氨基嘌呤(Ap)荧光峰强度和相对荧光量子产率来研究DNA分子内电荷转移.实验中直接分辨和观测到双链DNA分子内电荷转移超交换机理,超交换机理在近距离起作用;而电荷转移跳跃机理,可能是通过极子运动形式体现. 展开更多
关键词 双链DNA 分子内电荷转移 二氨基嘌呤 超交换机理 跳跃机理 隧道机理
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谈铁路隧道二衬开裂机理与处理预防措施
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作者 石晨俊 《山西建筑》 2014年第10期179-180,共2页
针对二次衬砌开裂对铁路隧道工程质量与安全造成严重威胁的情况,结合工程案例,对铁路隧道二次衬砌开裂机理进行了研究,并提出了铁路隧道二次衬砌开裂处理与预防措施,以保证隧道行车安全性与稳定性。
关键词 铁路隧道 二衬 开裂机理 措施
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岩石隧道掘进机的施工预测模型 被引量:42
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作者 龚秋明 赵坚 张喜虎 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2004年第z2期4709-4714,共6页
分析了岩石隧道掘进机的破岩机理,介绍了自上世纪70年代以来发展的一系列施工预测模型,包括单因素预测模型、综合预测模型(CSM模型和NTNU模型)、岩体分类预测模型(QTBM模型)、概率模型、模糊神经网络模型。单因素预测模型中包括的主要... 分析了岩石隧道掘进机的破岩机理,介绍了自上世纪70年代以来发展的一系列施工预测模型,包括单因素预测模型、综合预测模型(CSM模型和NTNU模型)、岩体分类预测模型(QTBM模型)、概率模型、模糊神经网络模型。单因素预测模型中包括的主要岩石材料参数有岩石单轴抗压强度、抗拉强度及岩石的总硬度;CSM模型主要是基于线性切割试验机岩石试验数据,其初始预测模型中包括岩石单轴抗压强度及抗拉强度;NTNU模型是一套完整的预测模型,包括掘进速度、进度预测、刀具的磨损预测及经济分析,在它的施工进度预测模型中,考虑到了岩石的可钻性、孔隙度及岩体节理的密度及方向;QTBM模型源自于Q系统,加入了一些与隧道掘进机及与掘进速度相关的参数;概率模型是基于一个庞大数据库的类比模拟模型;模糊神经网络模型是一种黑箱模型,克服了输入与输出之间的不确定性关系。 展开更多
关键词 隧道工程 岩石隧道掘进机 破岩机理 预测模型
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某超大断面高铁隧道出口段失稳分析与加固处置措施 被引量:5
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作者 江帆 熊裕林 +1 位作者 韩瑞祥 辛怡安 《安徽建筑工业学院学报(自然科学版)》 2013年第6期25-30,共6页
隧道的进出口边坡稳定性问题常是隧道工程建设中的关键问题,施工中容易发生仰坡坍塌、衬砌变形等不良地质现象。以某超大断面高铁隧道出口段发生滑坡为工程实践,首先列出该隧道出口段不良地质现象变形特性,然后分析了该滑坡-隧道相互作... 隧道的进出口边坡稳定性问题常是隧道工程建设中的关键问题,施工中容易发生仰坡坍塌、衬砌变形等不良地质现象。以某超大断面高铁隧道出口段发生滑坡为工程实践,首先列出该隧道出口段不良地质现象变形特性,然后分析了该滑坡-隧道相互作用机理以及该失稳现象的成因,根据现场实测数据判断该失稳处于加速变形阶段,应采取紧急加固措施;通过截水排水工程、明洞与明暗交界处加固、边仰坡加强防护措施保障了隧道安全施工,现场实测数据说明该加固方案思路是正确的,为类似工程实践提供借鉴。 展开更多
关键词 隧道洞口段 失稳 滑坡一隧道作用机理 处置措施 监控量测
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隧道的依时性收敛—Ⅰ.模型公式
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作者 PAW,YW 刘洪洲 《公路隧道》 2000年第4期4-8,共5页
理解隧道收敛机理对设计隧道必需要支护是至关重要的。为五约束法中考虑不同的时间效应,将不同因素与时间关解决它们的共同效应是可能的。因此,隧道的依时性变形问题能够作为一个粘弹性问题来建模。从基于一个标准步骤的弹性解能够得... 理解隧道收敛机理对设计隧道必需要支护是至关重要的。为五约束法中考虑不同的时间效应,将不同因素与时间关解决它们的共同效应是可能的。因此,隧道的依时性变形问题能够作为一个粘弹性问题来建模。从基于一个标准步骤的弹性解能够得到对应的各种粘弹模型的解。本文提出了一种分级方法来模拟流变岩体中隧道的开挖/建造过程,它考虑了:a.岩体的流变性质;b.隧道的掘进;c.隧道一支护的相互作用。 展开更多
关键词 隧道收敛机理 隧道支护 Ⅰ.模型公式 掘进效应
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Experimental study on acoustic emission characteristics of jointed rock mass by double disc cutter 被引量:5
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作者 LIN Qi-bin CAO Ping +3 位作者 LI Kai-hui CAO Ri-hong ZHOU Ke-ping DENG Hong-wei 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第2期357-367,共11页
The characteristics of joints are crucial factors which influence the penetration efficiency of tunnel boring machine(TBM).Based on the theoretical study,numerical simulation and experimental research,many researchers... The characteristics of joints are crucial factors which influence the penetration efficiency of tunnel boring machine(TBM).Based on the theoretical study,numerical simulation and experimental research,many researchers have studied the interaction between TBM disc cutters and jointed rock mass.However,in most of these works,the effect of joint on rock fragmentation by double disc cutter has been scarcely investigated.Thus,the effects of joint orientation and joint space on rock fragmentation by double disc cutter are highlighted in this study.During the test,jointed concrete specimens are adopted to simulate jointed rock mass.Improved RYL-600rock shear rheological instrument was employed during the indentation process under disc cutters,and acoustic emission location system was used to analyze the rock damage and physical deterioration.The results show that there are four failure modes and three modes of crack initiation and propagation in jointed rock mass.It is concluded that the existing joint planes have obviously restrained the crack initiation and propagation during the rock fragmentation process.The results also indicate that samples are damaged most seriously when joint orientation equals60°,which is proved to be the optimum joint orientation in TBM penetration. 展开更多
关键词 tunnel boring machine (TBM) jointed rock mass rock fragmentation crack propagation acoustic emission
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Failure mechanism of large-diameter shield tunnels and its effects on ground surface settlements 被引量:5
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作者 杨宇友 李宏安 《Journal of Central South University》 SCIE EI CAS 2012年第10期2958-2965,共8页
A new technique for the analysis of the three-dimensional collapse failure mechanism and the ground surface settlements for the large-diameter shield tunnels were presented.The technique is based on a velocity field m... A new technique for the analysis of the three-dimensional collapse failure mechanism and the ground surface settlements for the large-diameter shield tunnels were presented.The technique is based on a velocity field model using more different truncated solid conical blocks to clarify the multiblock failure mechanism.Furthermore,the shape of blocks between the failure surface and the tunnel face was considered as an entire circle,and the supporting pressure was assumed as non-uniform distribution on the tunnel face and increased with the tunnel embedded depth.The ground surface settlements and failure mechanism above large-diameter shield tunnels were also investigated under different supporting pressures by the finite difference method. 展开更多
关键词 large-diameter shield tunnel failure mechanism ground surface settlements limit analysis theory supporting pressures
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Model test to investigate failure mechanism and loading characteristics of shallow-bias tunnels with small clear distance 被引量:11
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作者 雷明锋 林大涌 +3 位作者 杨伟超 施成华 彭立敏 黄娟 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第12期3312-3321,共10页
Based on the similarity theory,a tunnel excavation simulation testing system under typical unsymmetrical loading conditions was established.Using this system,the failure mechanism of surrounding rock of shallow-bias t... Based on the similarity theory,a tunnel excavation simulation testing system under typical unsymmetrical loading conditions was established.Using this system,the failure mechanism of surrounding rock of shallow-bias tunnels with small clear distance was analyzed along with the load characteristics.The results show that:1) The failure process of surrounding rock of shallow-bias tunnels with small clear distance consists of structural and stratum deformation induced by tunnel excavation; Microfracture surfaces are formed in the tunnel surrounding rock and extend deep into the rock mass in a larger density; Tensile cracking occurs in shallow position on the deep-buried side,with shear slip in deep rock mass.In the meantime,rapid deformation and slip take place on the shallow-buried side until the surrounding rocks totally collapse.The production and development of micro-fracture surfaces in the tunnel surrounding rock and tensile cracking in the shallow position on the deep-buried side represent the key stages of failure.2) The final failure mode is featured by an inverted conical fracture with tunnel arch as its top and the slope at tunnel entrance slope as its bottom.The range of failure on the deep-buried side is significantly larger than that on the shallow-buried side.Such difference becomes more prominent with the increasing bias angle.What distinguishes it from the "linear fracture surface" model is that the model proposed has a larger fracture angle on the two sides.Moreover,the bottom of the fracture is located at the springing line of tunnel arch.3) The total vertical load increases with bias angle.Compared with the existing methods,the unsymmetrical loading effect in measurement is more prominent.At last,countermeasures are proposed according to the analysis results: during engineering process,1) The surrounding rock mass on the deep-buried side should be reinforced apart from the tunnel surrounding rock for shallow-buried tunnels with small clear distance; moreover,the scope of consolidation should go beyond the midline of tunnel(along the direction of the top of slope) by 4 excavation spans of single tunnel.2) It is necessary to modify the load value of shallow-bias tunnels with small clear distance. 展开更多
关键词 shallow-bias tunnels with small spacing failure mechanism loading characteristics model test
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Fracture mechanism of inversed trapezoidal shaped tunnel excavated in 45° inclined rock strata 被引量:3
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作者 He Manchao Peng Yanyan +3 位作者 Zhao Shuaiyang Shi Haiyang Wang Ning Gong Weili 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期531-535,共5页
In order to understand failure mechanisms of the tunnel excavated in the stratified rock masses in deep mine, the physical modeling experiment by using the large-scale model was carried out. The field case simulated i... In order to understand failure mechanisms of the tunnel excavated in the stratified rock masses in deep mine, the physical modeling experiment by using the large-scale model was carried out. The field case simulated in the experiment is a main connection tunnel located at depth of 1000 m in Qishan coal mine,Xuzhou mining district. Tunnel deformation was monitored by using strain gauges and a video camera simultaneously. Crack initiation and propagation process during the test were analyzed based on image analysis of the captured video photographs. At the same time, deformation process of the key monitoring points around the tunnel section is given by the monitored strain plots. Under the increasing external loads, crack initiation occurs firstly on the left wall of the tunnel, then on the immediate roof.Complete failure of the tunnel occurs as a result of the slippage of the rock layers along the interfaces. 展开更多
关键词 Stratified rock mass INCLINATION Crack propagation Strain analysis Physical modeling
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Catastrophe stability analysis for shallow tunnels considering settlement 被引量:3
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作者 HUANG Xiao-lin ZHANG Rui 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第4期949-960,共12页
Limit analysis of the stability of geomechanical projects is one of the most difficult problems.This work investigates the influences of different parameters in NL failure strength on possible collapsing block shapes ... Limit analysis of the stability of geomechanical projects is one of the most difficult problems.This work investigates the influences of different parameters in NL failure strength on possible collapsing block shapes of single and twin shallow tunnels with considering the effects of surface settlement.Upper bound solutions derived by functional catastrophe theory are used for describing the distinct characteristics of falling blocks of different parts in twin tunnels.Furthermore the analytical solutions of minimum supporting pressures in shallow tunnels are obtained by the help of the variational principle.Lastly,the comparisons are made both in collapsed mechanism and stability factor with different methods.According to the numerical results in this work,the influences of different parameters on the size of collapsing block are presented in the tables and the limit supporting loads are illustrated in the form graphs that account for the surface settlement. 展开更多
关键词 collapse mechanism twin shallow tunnel failure criterion surface settlement functional catastrophe theory
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Limit analysis of roof collapse in tunnels under seepage forces condition with three-dimensional failure mechanism 被引量:9
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作者 覃长兵 孙志彬 梁桥 《Journal of Central South University》 SCIE EI CAS 2013年第8期2314-2322,共9页
The state of roof collapse in tunnels is actually three-dimensional, so constructing a three-dimensional failure collapse mechanism is crucial so as to reflect the realistic collapsing scopes more reasonably. Accordin... The state of roof collapse in tunnels is actually three-dimensional, so constructing a three-dimensional failure collapse mechanism is crucial so as to reflect the realistic collapsing scopes more reasonably. According to Hoek-Brown failure criterion and the upper bound theorem of limit analysis, the solution for describing the shape of roof collapse in circular or rectangular tunnels subjected to seepage forces is derived by virtue of variational calculation. The seepage forces calculated from the gradient of excess pore pressure distribution are taken as external loading in the limit analysis, and it is of great convenience to compute the pore pressure with pore pressure coefficient. Consequently, the effect of seepage forces is taken as a work rate of external force and incorporated into the upper bound limit analysis. The numerical results of collapse dimensions with different rock parameters show great validity and agreement by comparing with the results of that with two-dimensional failure mechanism. 展开更多
关键词 TUNNEL Hoek-Brown criterion three-dimensional collapse mechanism seepage force
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Study on mechanism of circumferential cracks in cold-region tunnels 被引量:2
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作者 ZHOU Lincong ZHENG Yifeng LI Zhong 《Global Geology》 2010年第2期75-78,共4页
There exists frost damage in cold-region tunnels. The circumferential cracks affect the function of tunnels. Using three-dimensional finite element method, the authors analyzed the mechanism of circumferential cracks ... There exists frost damage in cold-region tunnels. The circumferential cracks affect the function of tunnels. Using three-dimensional finite element method, the authors analyzed the mechanism of circumferential cracks in cold-region tunnels It is proved that the internal thermal stress in lining exceeds the tensile strength of concrete, which is the direct cause for circumferential cracks occurring. The laws of thermal stress in lining induced by parameters such as temperature drop, horizontal drag coefficient and length of lining are analyzed. The conclusions are valuable to the design and construction of cold-region tunnels considering the thermal stress. 展开更多
关键词 TUNNEL cold region circumferential crack temperature stress
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Zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel
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作者 谷新保 毕靖 许明 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期4074-4082,共9页
In order to investigate zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel, a new mechanical model subjected to dynamic unloading under hydrostatic pressure condition is proposed. T... In order to investigate zonal disintegration mechanism of isotropic rock masses around a deep spherical tunnel, a new mechanical model subjected to dynamic unloading under hydrostatic pressure condition is proposed. The total elastic stress-field distributions is determined using the elastodynamic equation. The effects of unloading rate and dynamic mechanical parameters of isotropic deep rock masses on the zonal disintegration phenomenon of the surrounding rock masses around a deep spherical tunnel as well as the total elastic stress field distributions are considered. The number and size of fractured and non-fractured zones are determined by using the Hoek-Brown criterion. Numerical computation is carried out. It is found from numerical results that the number of fractured zones increases with increasing the disturbance coefficient, in-situ stress, unloading time and unloading rate, and it decreases with increasing parameter geological strength index, the strength parameter and the uniaxial compressive strength of intact rock. 展开更多
关键词 zonal disintegration mechanism isotropic rock mass spherical tunnel dynamic unloading
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Clinical observation on Wang Juyi's applied channel theory in treating stroke-sequel patients 被引量:2
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作者 Luo Lu Yu Zheng +3 位作者 Yang Yuyang Liu Jing Zhou Wei Wang Juyi 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2018年第4期593-600,共8页
OBJECTIVE:To explore the advantages of acupuncture treatment guided by channel palpation on stroke-sequel patients.METHODS:This research was randomized,traditional acupuncture controlled trial using channel palpation ... OBJECTIVE:To explore the advantages of acupuncture treatment guided by channel palpation on stroke-sequel patients.METHODS:This research was randomized,traditional acupuncture controlled trial using channel palpation acupuncture to treat stroke-sequel patients.Totally 148 patients who were randomly assigned to two experimental groups.The treatment group,i.e,the channel palpation group was treated with Dr.Wang Juyi's Channel Palpation.Patients in control group received acupuncture according to New Century Acupuncture.Every patient was needled at Renzhong(GV 26),Baihui(GV 20),Neiguan(PC 6),Jiquan(HT 1),Chize(LU 5),Weizhong(BL 40),Sanyinjiao(SP 6),Zusanli(ST 36),and each acupuncture treatment was modified according different syndrome differentiations including liver yang rising [Taichong(LR 3),Taixi(KI 3)],wind-phlegm blocking collaterals [Fenglong(ST 40),Hegu(LI 4)],phlegm-heat occupying in the Fu-organs [Quchi(LI11),Neiting(ST 44),Fenglong(ST 40)],Qi deficiency with blood stasis [Qihai(CV 6),Xuehai(SP 10)],Yin Deficiency with wind [Taixi(KI 3),Fengchi(GB 20)];for wry mouth,add Jiache(ST 6),Dicang(ST 4);for paralyzed arms,add Jianyu(LI 15),Quchi(LI 11),Shousanli(LI 10) and Hegu(LI 4),for paralyzed legs,add Huantiao(GB 30),Yinlingquan(SP 9) and Fengshi(GB 31).The duration of each treatment was 6 weeks.Then the Fugl-Meyer score,the Stroke Specific Quality of Life scale(SS-QOL),and the National Institute of Health Stroke Scale(NIHSS) were assessed before treatments,after 6 and 12 weeks of treatments to evaluate the acupuncture effect in each group.The data were collected and analyzed after the completion of treatment by SPSS 17 using paired sample t-test.RESULTS:Totally 148 participants were recruited,and 136 eligible patients were included in this study.The results showed that for FMA motor function and Fugl-Meyer balance function and NIHSS,there is no statistic difference between two groups at the baseline period,after 6-week treatment and after 12-week follow-up(P > 0.05);However,for NIHSS and SS-QOL,there is no statistic difference between two groups at the baseline period and 6 weeks after treatment(P > 0.05).However,statistical difference starts to appear after 12-week(P =0.028,0.037 < 0.05).CONCLUSION:We conclude that as for improving the nerve function and the quality of life,Dr.Wang Juyi's Applied Channel Theory presents a better clinical result. 展开更多
关键词 Acupuncture Channel Palpation Stroke-sequel Wang Juyi
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