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Experimental and measured research on three-dimensional deformation law of gas drainage borehole in coal seam

International Journal of Mining Science and Technology 2020年第3期30卷 397-403页

作者： Hongbao Zhao Jinyu Li Yihong Liu Yikuo Wang Tao Wang Hui Cheng College of Energy and Mining China University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

Using self-researched gas drainage borehole stability dynamic monitoring device, three-dimensional deformation characteristics of borehole under steady vertical load were researched experimentally and systematically. This research indicated that under the action of steady loading, the mechanical deformation path of the simulated gas drainage borehole is gradually complicated, and the decay of the borehole circumferential strain is an important characterization of the prediction and early warning of borehole instability and collapse. The horizontal position of borehole occurs compressive strain, and the vertical of which occurs tensile strain under the action of vertical stress. At the initial stage of loading, the vertical strain is more sensitive than that in the horizontal direction. After a certain period of time, the horizontal strain is gradually higher than the vertical one, and the intersection of the borehole horizontal diameter and the hole wall is the stress concentration point. With the increase of the depth of hole, the strain shows a gradual decay trend as a whole, and the vertical strain decays more observably, but there is no absolute position correlation between the amount of strain decay and the increase in borehole depth,and the area within 1.5 times the orifice size is the borehole stress concentration zone.

关键词： gas drainage borehole Dynamic monitoring Strain-time curve Three-dimensional deformation law

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Numerical simulation on the movement law of overlying strata in the stope with a fault and analysis of its influence on the ground gas drainage boreholes

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Journal of Coal Science & Engineering(China) 2007年第3期13卷 266-270页

作者：胡千庭闫晶晶程国强 Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266510 China Chongqing Branch China Coal Research Institute Chongqing 400037 China China University of Mining and Technology （Beijing） Beijing 100083 China

In order to study the influence of a fault on the movement law of the overlying strata as well as its effect on the gas drainage boreholes, based on the practical situation of 1242（1） panel at Xieqiao Mine in Huainan, the Finite Element Method （FEM） model was built up, and the distribution of the stress field and the displacement field of the overlying strata in the stope with a fault were simulated by using the FEM software ANSYS. The results indicate that because of the existence of the fault, the horizontal displacement of overlying strata near the gas drainage borehole becomes larger than that in the stope without a fault, and the distribution of the stress field of the overlying strata changes greatly. When the working face is far away from the fault, the distribution of the stress field is approximately symmetrical. As the working face advances to the place 50 m away from the fault, the stress range at the right side goaf area is as twice as that at the left side. Here, the stress distribution area of goaf area and the fault plane run through, the fracture-connected-zone is formed. It can be presumed that the gas adsorbed in the coal and rock will flow into the fault zone along the fracture-connected-zone, which causes the quantity of gas drainage reduce remarkably.

关键词： fault overlying strata numerical simulation gas drainage borehole

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Development and Application of High Power Directional Drilling Rig

Development and Application of High Power Directional Drilli...

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作者： Rui ZHANG Ke YAO Peng FANG Xiang CHEN Rui MENG Xi’an Research Institute China Coal Technology ＆ Engineering Group Corp

The working face length of existing super large coal mines has been increased to more than 2000 *** rapid mechanized mining of super long working face of large coal mines has increasingly urgent demand for efficient prevention technology of gas and water disasters,etc.,and higher requirements have been put forward for the depth,drilling efficiency and quality of directional holes for disaster *** long-distance accurate detection and disaster prevention is a large modern coal mine safe and efficient mining of major requirements,in order to maintain dug balance,guarantee the safety in production,large diameter long directional hole is the key to meet the above requirements,to meet the above requirements,developed the capacity of 1,500 m drilling ZDY15000 LD power directional drilling *** general layout design,gyroscope,feed device,brake device,hydraulic system with protective function and other key technologies of high-power directional drilling rig were studied,and the load performance of drilling rig was *** industrial test was carried out in Pansan mine of Huainan mining industry to verify the technical performance of the drilling *** test results show that the high-power directional drilling rig has strong drilling capacity and strong accident handling capacity,which ensures safe and efficient underground mining.

关键词： gas drainage borehole directional drilling rig high-power full hydraulic power the key technology

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