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Ground stress and its impact on the stability of the surrounding rock in the Lüliang mining area

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Mining Science and Technology 2011年第5期21卷 625-630页

作者： wang lianguo Lu Yinlong State Key Laboratory of Geomechanics and Deep Underground Engineering Xuzhou 221008 China

Ground stress is the fundamental cause of deformation and failure during underground structural engineering. Field stress measurements in the main coal bed in the Lueliang mining area were made by the bore hole, stress relief method. From these data the ground stress distribution of the mining area was obtained. The relationship between the horizontal principal stress and the deformation and failure of a roadway is discussed with an engineering example. The results indicate that horizontal stress dominates in the shallow crust in the Ltiliang mining area. Roadways at different angles to the maximum principal stress have different levels of stress concentration. This leads to a significant difference in stability of the corresponding roadways. These research results provide an important criterion for determining roadway position and direction, stope layout, and roadway support design.

关键词： Ground stress measurementBoring stress-relief methodDistribution ruleStability of surrounding rock

Roadway failure and support in a coal seam underlying a previously mined coal seam

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International Journal of Mining Science and Technology 2012年第5期22卷 619-624页

作者： Lu Yinlong wang lianguo Zhang Bei State Key Laboratory of Geomechanics and Deep Underground Engineering Xuzhou 221008 China School of Mines China University of Mining & Technology Xuzhou 221008 China

The influence of an upper,mined coal seam on the stability of rock surrounding a roadway in a lower coal seam is *** technical problems of roadway control are discussed based on the geological conditions existing in the Liyazhuang Mine No.2 coal *** stress distribution and floor failure in the lower works after mining the upper coal is studied through numerical *** failure mechanism of the roof and walls of a roadway located in the lower coal seam is *** predicted deformation and failure of the roadway for different distances between the two coal seams are used to design two ways of supporting the lower *** is a combined support consisting of anchors with a joist steel tent and a combined anchor truss.A field test of the design was performed to good *** results have significance for the design of supports for roadways located in similar conditions.

关键词： Adjacent coal seams Floor destruction of the upper coal Lower coal roadway Deformation and failure Support measure

Plastic zone analysis and support optimization of shallow roadway with weakly cemented soft strata

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International Journal of Mining Science and Technology 2015年第3期25卷 395-400页

作者： Zhang Jihua wang lianguo Li Qinghai Zhu Shuangshuang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology School of Mechanics & Civil Engineering China University of Ming and Technology College of Resources and Environmental Engineering Shandong University of Science and Technology

Based on a shallow roadway with weakly cemented soft strata in western China, this paper studies the range and degree of plastic zones in soft strata roadways with weak cementation. Geological radars were used to monitor the loose range and level of surrounding rocks. A mechanical model of weakly cemented roadway was established, including granular material based on the measured results. The model was then used to determine the plastic zone radium. The predicted results agree well with measured results which provide valuable theoretical references for the analysis of surrounding rock stability and support reinforcing design of weakly cemented roadways. Finally, a combined supporting scheme of whole section bolting and grouting was proposed based on the original supporting scheme. It is proved that this support plan can effectively control the deformation and plastic zone expansion of the roadway surrounding rock and thus ensure the long-term stable and safe mining.

关键词： Shallow coal seam Weakly cemented soft strata Granular material Geological radar Whole section bolting and grouting Combined supporting

An experimental study of a yielding support for roadways constructed in deep broken soft rock under high stress

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Mining Science and Technology 2011年第6期21卷 839-844页

作者： Lu Yinlong wang lianguo Zhang Bei State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining ＆ Technology Xuzhou 221008 China School of Mines China University of Mining ＆ Technology Xuzhou 221008 China

A rationally designed support for deep roadways excavated in broken soft rock under high stress was investigated. The deformation and failure characteristics and the mechanism of ''yielding support'' was studied for anchor bolts and cables. The rail roadway of the 2-501 working face in the Liyazhuang Mine of the Huozhou coal area located in Shanxi province was used for field trials. The geological conditions used there were used during the design phase. The new ''highly resistant, yielding'' support system has a core of high strength, yielding bolts and anchor cables. The field tests show that this support system adapts well to the deformation and pressure in the deep broken soft rock. The support system effectively controls damage to the roadway and ensures the long term stability of the wall rock and safe production in the coal mine. This provides a remarkable economic and social benefit and has broad prospects for fur- ther application.

关键词： High stress Broken soft rock Roadways Yielding support Yielding anchor bolt

Application of micro-seismic monitoring technology in mining engineering

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International Journal of Mining Science and Technology 2012年第1期22卷 79-83页

作者： Sun lian wang lianguo Hou Huaqiang School of Energy and Safety Anhui University of Sdence&TechnologyHuainan 232001China State Key Laboratory of Geomechanics&Deep Underground Engineeing China University of Mining&TechnologyXuzhou 221008China

Micro-seismic phenomena, occurring when rock masses are subjected to forces and failures, allow the determination of their unstable states and failure zones by analyzing micro-seismic signals. We first present the principles of micro-seismic monitoring and location, as well as an underground explosion-proof micro-seismic monitoring system. Given a practical engineering application, we describe the application of micro-seismic monitoring technology in determining the height of a "two-zone" overburden, i.e., a caving zone and a fracture zone, the width of a coal-pillar section and the depth of failure of a floor. The workfaces monitored accomplished safe and highly efficient mining based on our micro-seismic monitoring results and provide direct proof of the reliability and validity of micro-seismic monitoring technology.

关键词： Micro-seismic phenomenon Micro-seismic monitoring Micro-seismic location Mining engineering

Ground pressure and overlying strata structure for a repeated mining face of residual coal after room and pillar mining

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International Journal of Mining Science and Technology 2016年第4期26卷 645-652页

作者： Jiang Bangyou wang lianguo Lu Yinlong Sun Xiaokang Jin Gan State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou 221008 China

To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis. The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting condi- tions of the repeated mining face were obtained. The results indicate that when the repeated mining face passes the residual pillars, the sudden instability causes fracturing in the main roof above the old goal and forms an extra-large rock block above the mining face. A relatively stable ＂Voussoir beam＂ structure is formed after the advance fracturing of the main roof. When the repeated mining face passes the old goaf, as the large rock block revolves and touches gangue, the rock block will break secondarily under overburden rock loads. An example calculation was performed involving an integrated mine in Shanxi province, results showed that minimum working resistance values of support determined to be reason- able were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf. On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.

关键词： Residual coal after room and pillar mining Repeated mining Fully mechanized caving face Roof control Support resistance

Roadway layout for recycling residual coal pillar in room-and-pillar mining of thick coal seam

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International Journal of Mining Science and Technology 2015年第5期25卷 729-734页

作者： Jin Gan wang lianguo Zhang Jihua Hu Minjun Duan Ning State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221008 China School of Mechanics & Civil Engineering China University of Mining & Technology Xuzhou 221666 China

In the context of a room-and-pillar mining gob in Shanxi province in China,this paper numerically investigates the stress distribution and deformation rules of roadway surrounding rocks at various locations of residual coal pillars in room-and-pillar mining gobs using software FLAC3 *** is found that the concentrated stress beneath coal pillars distributes in a shape of ellipse.A reasonable roadway layout is then *** this design,it is indicated that roadways should be designed to avoid the supporting zones of pillars with increasing compression and take into account the roof falling and crushing in the upper *** to the surrounding rock deformation characteristics and mining roadway locations as well as the supporting principles of timely support,rock reinforcing,piecewise management and suiting local conditions,a new asymmetric shield supporting plan is *** field surveying results show that this supporting plan can effectively control the roadway rock deformation,thus guarantee the safe and smooth construction of roadways.

关键词： Room-and-pillar mine Residual coal pillar Repeated mining Roadway layout Asymmetric support

Analysis of insidious fault activation and water inrush from the mining floor

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International Journal of Mining Science and Technology 2014年第4期24卷 477-483页

作者： Hu Xinyu wang lianguo Lu Yinlong Yu Mei College of Mechanics and Civil Engineering China University of Mining & Technology State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology

Based on the stress field distribution rule of the mining floor under abutment pressure, we have established a simplified mechanical model, which contains multiple factors relating to activation and evolution of insidious water-conductive faults. The influence of normal and shear stresses on fault activation and effective shear stress distribution in the fault plane was acquired under mining *** fracture mechanics theory to calculate the stress intensity factor of an insidious fault front, we have derived the criterion for main fault activation. Results indicate that during the whole working face advance, transpressions are exerted on fault planes twice successively in opposite directions. In most cases, the second transpression is more likely to lead to fault activation. Activation is influenced by many factors, predominant among which are: burial depth of the insidious fault, friction angle of the fault plane, face advance direction and pore water pressure. Steep fault planes are more easily activated to induce a sustained water inrush in the face.

关键词： Insidious fault Effective shear stress Stress intensity factor Fault activation Water inrush

Determining areas in an inclined coal seam floor prone to water-inrush by micro-seismic monitoring

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Mining Science and Technology 2011年第2期21卷 165-168页

作者： Sun Jian wang lianguo wang Zhansheng Hou Huaqiang Shen Yifeng State Key Laboratory of Geomechanics ＆ Deep Underground Englineering China University of Mining ＆ Technology Xuzhou 221008 China School of Sciences China University of Mining ＆ Technology Xuzhou 221116 China

The failure depth of the coal seam floor is one important consideration that must be kept in mind when mining is carried out above a confined *** the floor failure depth is the essential precondition for predicting the water-resisting ability of the *** have used a high-precision microseismic monitoring technique to overcome the limited amount of data available from field measurements. The failure depth of a coal seam floor,especially an inclined coal seam floor,may be more accurately estimated by monitoring the continuous,dynamic failure of the *** monitoring results indicate the failure depth of the coal seam floor near the workface conveyance roadway（the lower crossheading） is deeper and that the failure range is wider here compared to the coal seam floor near the return airway（the upper crossheading）.The results of micro-seismic monitoring show that the dangerous area for water-inrush from the coal seam floor may be *** provides an important field measurement that helps ensure safe and highly efficient mining of the inclined coal seam above the confined aquifer at the Taoyuan Coal Mine.

关键词： Inclined coal seam Water-inrush from floor Dangerous area Micro-seismic monitoring