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Coefficients of earth pressure at rest in thick and deep soils 被引量:9
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作者 TIAN Qiu-hong XU Zhi-wei ZHOU Guo-qing ZHAO Xiao-dong HU Kun 《Mining Science and Technology》 EI CAS 2009年第2期252-255,共4页
The effect of test methods and stress paths on the experimental value of the coefficient of earth pressure at rest, K0, was investigated under high pressures. The results indicate that the rigid pressure chamber and f... The effect of test methods and stress paths on the experimental value of the coefficient of earth pressure at rest, K0, was investigated under high pressures. The results indicate that the rigid pressure chamber and flexible lateral confining pressure medium method gives a stress ratio at the initial stage that is not the real K0. Moreover, K0 increases during the loading process becoming greater at high pressures. In the unloading process, however, K0 increases only at the initial stage but decreases thereafter. In addition, the incremental magnitude definition, K0=dσ3/dσ1, gives higher values than the total magnitude definition, K0=σ3/σ1, under loading. This is also true during initial stages of unloading. The experiment results also indicate that earth pressure at rest in deep and thick soils can be estimated by a power function of axial and confining pressures. It is necessary to choose the appropriate Kn to avoid some accidents. 展开更多
关键词 experimental research earth pressure at rest loading and unloading paths thick and deep soils
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Cable-truss supporting system for gob-side entry driving in deep mine and its application 被引量:3
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作者 Yin Qian Jing Hongwen +3 位作者 Dai Dapeng Zhu Tantan Zhao Honghui Meng Bo 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期885-893,共9页
In order to solve the large deformation controlling problem for surrounding rock of gob-side entry driving under common cable anchor support in deep mine, site survey, physical modeling experiment, numerical simulatio... In order to solve the large deformation controlling problem for surrounding rock of gob-side entry driving under common cable anchor support in deep mine, site survey, physical modeling experiment, numerical simulation and field measurement were synthetically used to analyze the deformation and failure characteristics of surrounding rock. Besides, applicability analysis, prestress field distribution characteristics of surrounding rock and the control effect on large deformation of surrounding rock were also further studied for the gob-side entry driving in deep mine using the cable-truss supporting system. The results show that, first, compared with no support and traditional bolt anchor support, roof cable-truss system can effectively restrain the initiation and propagation of tensile cracks in the roof surrounding rock and arc shear cracks in the two sides, moreover, the broken development of surrounding rock, roof separation and extrusion deformation between the two sides of the roadway are all controlled; second, a prestressed belt of trapezoidal shape is generated in the surrounding rock by the cable-truss supporting system, and the prestress field range is wide. Especially, the prestress concentration belt in the shallow surrounding rock can greatly improve the anchoring strength and deformation resisting capability of the rock stratum;third, an optimized support system of ‘‘roof and side anchor net beam, roof cable-truss supporting system and anchor cable of the narrow coal pillar" was put forward, and the support optimization design and field industrial test were conducted for the gob-side entry driving of the working face 5302 in Tangkou Mine, from which a good supporting effect was obtained. 展开更多
关键词 Deep mine Gob-side entry driving Cable-truss supporting system Deformation and failure STABILITY
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Study on the shear strength of deep reconstituted soils 被引量:4
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作者 ZHAO Xiao-dong ZHOU Guo-qing TIAN Qiu-hong 《Mining Science and Technology》 EI CAS 2009年第3期405-408,共4页
Based on analytical methods of strength studies for deep soils, direct shear tests were carried out to investigate the shear strength of deep reconstituted soils at different initial dry densities and amounts of water... Based on analytical methods of strength studies for deep soils, direct shear tests were carried out to investigate the shear strength of deep reconstituted soils at different initial dry densities and amounts of water.The results indicate that the shear strength of deep reconstituted soils for identical amounts of water below the plastic limit is enhanced with increasing dry density and but reduced sharply at the critical density, the point at which coarse particles break down.Moreover, the shear strength for identical dry density decreases with additional amounts of water and the rate of degradation is the greatest at the critical density.This is because the friction resistance between coarse particles reduces with increasing amounts of water higher than the plastic limit.In order to obtain reliable strength of deep reconstituted soils, suitable dry densities and amounts of water are necessary. 展开更多
关键词 deep reconstituted soils shear strength dry density water content critical density
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Study on the Test Method of Static Earth Pressure Coefficient of Deep Soils 被引量:6
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作者 XU Zhi-wei ZHOU Guo-qing +3 位作者 LIU Zhi-qiang ZHAO Xiao-dong LI Sheng-sheng ZHANG Lei 《Journal of China University of Mining and Technology》 EI 2007年第3期330-334,共5页
The static earth pressure coefficient of soils is,approximately,considered to be a constant in the view of clas-sical soil mechanics. This is supported by many research results. The high pressure experimental research... The static earth pressure coefficient of soils is,approximately,considered to be a constant in the view of clas-sical soil mechanics. This is supported by many research results. The high pressure experimental research and analysis of remolding deep soil described herein indicate that the static earth pressure of thick overburden has a notable non lin-ear characteristic. It also appears larger than that of superficial soils. It is necessary for deep coal mine design and con-struction to consider this particularity of soil pressure so as to avoid engineering accidents and heavy loss of life and property. 展开更多
关键词 thick overburden static earth pressure coefficient experimental research
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Structural motion of water-resisting key strata lying on overburden 被引量:4
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作者 PU Hai MIAO Xie-xing +1 位作者 YAO Bang-hua TIAN Mu-jun 《Journal of China University of Mining and Technology》 EI 2008年第3期353-357,共5页
Water-preserved mining is one of the important parts of the ‘Green Mining’ technological system. The purpose of wa-ter-preserved mining is to prevent water from bursting out in coal mines and thus to protect water r... Water-preserved mining is one of the important parts of the ‘Green Mining’ technological system. The purpose of wa-ter-preserved mining is to prevent water from bursting out in coal mines and thus to protect water resources. The principle of wa-ter-resisting key strata (WKS) is proposed to establish a model capable of guiding and developing water-preserved mining technol-ogy. The experimental model of the WKS is constructed following requirements of the Data Image Correlative Method (DICM). Five experimental schemes are designed according to different combined patterns of the WKS. The water-resisting performance of the WKS is analyzed from observation of structural stability. All of them provide referential value for water-preserved mining. 展开更多
关键词 water-preserved mining water-resisting key strata (WKS) digital image correlative method (DICM) water-inrush in coal mine
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Effect of the layer orientation on mechanics and energy evolution characteristics of shales under uniaxial loading 被引量:11
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作者 Hou Peng Gao Feng +2 位作者 Yang Yugui Zhang Xiangxiang Zhang Zhizhen 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期857-862,共6页
The uniaxial compression tests were conducted on the cylindrical shale specimens with bedding plane inclined at 0° and 90° to the axial loading direction, respectively. Effect of the bedding orientation on t... The uniaxial compression tests were conducted on the cylindrical shale specimens with bedding plane inclined at 0° and 90° to the axial loading direction, respectively. Effect of the bedding orientation on the mechanical property and energy evolution characteristics of shales was revealed. The failure mechanisms of the specimens with layers in 0° orientation showed splitting failure along weak bedding, while the specimens with layers in 90° orientation were failed by shearing sliding. The values of compressive strength, elastic modulus and shear modulus of samples at 0° were higher than those of samples at 90°and there was little difference of Poisson's ratio between samples at 0° and 90°. The analysis of the stress–strain energy and acoustic emission(AE) energy indicated that the growth rate of absorbed energy density and elastic energy density at 0° was significantly faster than that at 90°, hence their final values at 0°were relatively larger than the latter. Moreover, higher energy release was observed for specimens at 0°.The energy release and rapid growth of energy dissipation also appeared more early at 0°. The stress ratio63% was a critical point of energy distribution at which differences started to arise between samples at 0°and 90°. These results indicated that the failure of shale at 0° was more violent and devastative than the failure of shale at 90°. 展开更多
关键词 SHALE Layer orientation Energy evolutio Failure mechanism Uniaxial compression AE energy
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Application of remote monitoring technology in landslides in the Luoshan mining area 被引量:30
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作者 HE Man-chao TAO Zhi-gang ZHANG Bin 《Mining Science and Technology》 EI CAS 2009年第5期609-614,共6页
With the scale extending of mining, the landslide disaster in the earth’s surface will become more and more serious, and these landslide disasters are being threatened to the sustainable safe mining of the undergroun... With the scale extending of mining, the landslide disaster in the earth’s surface will become more and more serious, and these landslide disasters are being threatened to the sustainable safe mining of the underground mine and the open-pit mine. Based on the theory that sliding force is greater than the shear resistance (resisting force) at the potential slip surface is the necessary and sufficient condition to occur the landslide as the sliding criterion, the principle and method for sliding force remote monitoring is presented, and the functional relationship between the human mechanical quantity and the natural sliding force is derived, hereby, the natural sliding force can be calculated according to the human mechanical quantity. Based on above principle and method, a new system of landslide remote monitoring is designed and 53 systems are installed on the landslide body in the Luoshan mining area, which make up the landslide remote monitoring network. According to the results of field test around 8 months, monitoring curves between sliding force and time are obtained, which can describe and forecast the develop trend of landslide. According to above analysis, the results show that this system has some following advantages: (1) real-time monitoring; (2) remote intelligent transmission; (3) landslides early warning. 展开更多
关键词 mine exploitation landslide disaster sliding force monitoring forecasting and early warning
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Waste-filling in fully-mechanized coal mining and its application 被引量:27
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作者 MIAO Xie-xing ZHANG Ji-xiong FENG Mei-mei 《Journal of China University of Mining and Technology》 EI 2008年第4期479-482,共4页
A fully-mechanized coal mining (FMCM) technology capable of filling up the goaf with wastes (including solid wastes) is described. Industrial tests have proved that by using this technology not only can waste be re-us... A fully-mechanized coal mining (FMCM) technology capable of filling up the goaf with wastes (including solid wastes) is described. Industrial tests have proved that by using this technology not only can waste be re-used but also coal resources can be exploited with a higher recovery rate without removing buildings located over the working faces. Two special devices, a hydraulic support and a scraper conveyor, run side-by-side on the same working face to simultaneously realize mining and filling. These are described in detail. The tests allow analysis of rock pressure and ground subsidence when backfilling techniques are employed. These values are compared to those from mining without using backfilling techniques, under the same geological conditions. The concept of equivalent mining height is proposed based on theoretical analysis of rock pressure and ground subsidence. The upper limits of the rock pressure and ground subsidence can be estimated in backfilling mining using this concept along with traditional engineering formulae. 展开更多
关键词 fully-mechanized coal mining coal mining with gangue backfilling mining under buildings railways and water bodies rock pressure around coal face control of ground subsidence
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Nonlinear Elastic Constitutive Model of Soil-Structure Interfaces Under Relatively High Normal Stress 被引量:17
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作者 ZHOU Guo-qing XIA Hong-chun +1 位作者 ZHAO Guang-si ZHOU Jie 《Journal of China University of Mining and Technology》 EI 2007年第3期301-305,共5页
The shear characteristics of soil-structure interfaces with different roughness are studied systematically by us-ing the DRS-1 high normal stress and residual shear apparatus. The experimental results indicate that,un... The shear characteristics of soil-structure interfaces with different roughness are studied systematically by us-ing the DRS-1 high normal stress and residual shear apparatus. The experimental results indicate that,under a relatively high normal stress,normal stress and the coefficient of structural roughness are the most important factors affecting the mechanical interface characteristics. The relationship between shear stress and shear displacement of the soil-structure interface is a hyperbolic curve with high regression accuracy. Based on our experimental results,a nonlinear elastic con-stitutive model of the soil-structure interface under relatively high normal stress is established with a definite physical meaning for its parameters. The model can predict the strain hardening behavior of the soil during the shearing process. The results show an encouraging agreement with experimental data from direct shear tests. 展开更多
关键词 high normal stress standard medium sand INTERFACE strain hardening constitutive model
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Model experiment of rock blasting with single borehole and double free-surface 被引量:5
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作者 TIAN Jian-sheng QU Fan-fei 《Mining Science and Technology》 EI CAS 2009年第3期395-398,404,共5页
In order to improve the quality of laneways and tunnel excavation by drilling and blasting and by making effective use of explosive energy, a model experiment of rock blasting with a single borehole and a double free-... In order to improve the quality of laneways and tunnel excavation by drilling and blasting and by making effective use of explosive energy, a model experiment of rock blasting with a single borehole and a double free-surface was performed with the objective of studying the effect of parameters such as charge structure, free-surface and rock compressive strength on rock blasting.The model experiments indicate that:1) the smaller the rock compressive strength and density, the more distinctive the cavity expanding action by blasting;2) the powder factor in an air-decoupling charge structure is larger than that in a coupling charge structure, i.e., the explosive energy in an air-decoupling charge structure transferred to the rocks is less than that in a coupling charge structure;3) a free-surface improves the utilizations of explosive energy;4) an air-decoupling charge structure helps to maintain the integrity and stability of wall rock in controlled perimeter blasting, such as in roadways and tunnel excavation by drilling and blasting. 展开更多
关键词 model experiment single borehole cylindrical charge air-decoupling charge structure free surface
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Side abutment pressure distribution by field measurement 被引量:8
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作者 WANG Lian-guo SONG Yang +1 位作者 HE Xing-hua ZHANG Jian 《Journal of China University of Mining and Technology》 EI 2008年第4期527-530,共4页
Given the 7123 working face in the Qidong Coal Mine of the Wanbei Mining Group, nine dynamic roof monitors were installed in the crossheading to measure the amount and velocity of roof convergence in different positio... Given the 7123 working face in the Qidong Coal Mine of the Wanbei Mining Group, nine dynamic roof monitors were installed in the crossheading to measure the amount and velocity of roof convergence in different positions and at different times and three steel bored stress sensors were installed in the return airway to measure rock stress at depth. On the basis of this arrange- ment, the rule of change of the distribution of the side abutment pressure with the advance of the working face and movement of overlying strata was studied. The rule of change and the stability of rock stress at depth were measured. Secondly, the affected area and stability time of the side abutment pressure were also studied. The results show that: 1) During working, the face advanced distance was from 157 m to 99 m, the process was not effected by mining induced pressure. When the distance was 82 m, the posi- tion of peak stress was 5 m away from the coal wall. When the distance was 37 m, the position of peak stress away from the coal wall was about 15 m to 20 m and finally reached a steady state; 2) the time and the range of the peak of side rock pressure obtained from stress sensors were consistent with the results from the dynamic roof monitors; 3) the position of the peak pressure was 25 m away from the coal wall. 展开更多
关键词 field measurement side abutment pressure peak pressure pressure distribution
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Combined ANN prediction model for failure depth of coal seam floors 被引量:5
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作者 WANG Lian-guo ZHANG Zhi-kang +4 位作者 LU Yin-long YANG Hong-bo YANG Sheng-qiang SUN Jian ZHANG Jin-yao 《Mining Science and Technology》 EI CAS 2009年第5期684-688,共5页
Failure depth of coal seam floors is one of the important considerations that must be kept in mind when mining is carried out above a confined aquifer. In order to study the factors that affect the failure depth of co... Failure depth of coal seam floors is one of the important considerations that must be kept in mind when mining is carried out above a confined aquifer. In order to study the factors that affect the failure depth of coal seam floors such as mining depth, coal seam pitch, mining thickness, workface length and faults, we propose a combined artificial neural networks (ANN) prediction model for failure depth of coal seam floors on the basis of existing engineering data by using genetic algorithms to train the ANN. A practical engineering application at the Taoyuan Coal Mine indicates that this method can effectively determine the network struc- ture and training parameters, with the predicted results agreeing with practical measurements. Therefore, this method can be applied to relevant engineering projects with satisfactory results. 展开更多
关键词 artificial neural networks (ANN) floor failure depth genetic algorithms PREDICTION
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Mechanical performance of a double-face reinforced retaining wall in an area disturbed by mining 被引量:5
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作者 YU Guang-yun BAI Yong-sheng +1 位作者 SHENG Ping GUO Rui-ping 《Mining Science and Technology》 EI CAS 2009年第1期36-39,共4页
The application of a double-face reinforced retaining wall during road construction can reduce engineering costs, speed road paving and have a good influence on environment. An ABAQUS numerical model of a double-face ... The application of a double-face reinforced retaining wall during road construction can reduce engineering costs, speed road paving and have a good influence on environment. An ABAQUS numerical model of a double-face reinforced retaining wall was built. The influence of surface subsidence induced by mining was considered. A physical model test was also performed in the laboratory on a reinforced retaining wall. The influence of subsidence induced by mining was observed. The numerical results match measurements in the laboratory very well. The vertical pressure on the base of the retaining wall, the horizontal displacement of the wall and the horizontal soil pressure acting on the wall were analyzed. The differential settlement of the reinforced belt and axial forces in the wall were also studied. 展开更多
关键词 double-face reinforced retaining wall underground mining finite element method physical model test
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"Nonlinear" characteristics of the static earth pressure coefficient in thick alluvium 被引量:5
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作者 XU Zhi-wei ZENG Kai-hua +3 位作者 WEI Zhou LIU Zhi-qiang ZHAO Xiao-dong TIAN Qiu-hong 《Mining Science and Technology》 EI CAS 2009年第1期129-132,共4页
Exact calculations of the static earth pressure from a thick alluvium require accurate/Co values. These calculations influence the sinking cost and the safety of the freezing method. The static earth pressure coeffici... Exact calculations of the static earth pressure from a thick alluvium require accurate/Co values. These calculations influence the sinking cost and the safety of the freezing method. The static earth pressure coefficient (K0) of thick and deep soil was analyzed using laboratory tests. The results show that the static earth pressure coefficient of thick and deep soils is nonlinear and different from that of superficial soils. The constant of superficial soils is usually invariant and the total stress or incremental stress definitions used in traditional geo-meehanics give the same value. The influence of load increments when calculating for superficial soil is ignored. The difference in values of K0 for thick alluvium defimed by the total stress or the incremental stress methods is over 10%. The effects of the thick alluvium on K0 should be considered during the design of frozen shaft projects. Such things as the frozen shaft thickness and the excavated section height should be chosen to assure the rationality of the design and to avoid potential faults and accidents. 展开更多
关键词 thick alluvium static earth pressure coefficient NONLINEAR ANALYSIS
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Study on remote monitoring system for landslide hazard based on Wireless Sensor Network and its application 被引量:6
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作者 GUI Yang TAO Zhi-gang +1 位作者 WANG Chang-jun XIE Xing 《Journal of Coal Science & Engineering(China)》 2011年第4期464-468,共5页
Based on Beidou satellite communication platform, sliding force remote monitoring and warning system was widely used in Lingbao Luoshan gold ore, which had achieved remarkable social and economical benefits. However, ... Based on Beidou satellite communication platform, sliding force remote monitoring and warning system was widely used in Lingbao Luoshan gold ore, which had achieved remarkable social and economical benefits. However, there is one monitoring point at every 1 000 m2, and their distribution is so discrete that it will no doubt increase construction and operation cost if every monitoring point was installed a Beidou subscriber machine. Therefore, based on Zigbee wireless sensor network technology, network structure and the nodes, embed wireless sensor node in remote monitoring and warning system, a base platform of local wireless sensor network is formed, and it can combine punctiform monitoring information with planar network and transmit concentrated information through Beidou satellite terminal machine; as a result, this largely expands the transmission distance of monitoring data 展开更多
关键词 landslide monitoring warning system information collecting
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