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2005年中国机械工程学会年会

作者： LI Xingdong, LU Ying, DU Jiyou, LIU Zhaoxia (Shandong University of Science and Technology.Qingdao, 26651 O.China)

＜正＞The paper sets forth the accident hidden troubles checking, disposing and supervising method in coalmine according to the current situation of underground accident hidden troubles management and the theory of closed-loop system. This kind of method establishes the accident hidden troubles investigating and supervising system by combining the management of bidden troubles with computer database technology and network technology so as to computerize the working of counting, filtrating, categorizing and disposing feedback of the accident hidden troubles, and make the whole operations work in the Intranet, and also, computerize the counting and appraisal of the safety checking working personnel’s performance. The system makes the lever of management, disposing and supervision of accident hidden troubles higher than before, and provides reliable technological support in eliminating the accident hidden troubles in time, prevents accident from happening efficiently and ensures safety production completely. At the same time, it also plays an important role in reducing the rate of accidents occurring in coal mine, lowering the direct and indirect losing caused by accidents and accelerating the increasing of output.

关键词： coalmine accident hidden troubles management computer system

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Experiment and Simulation for Controlling Propagation Direction of Hydrofracture By Multi-Boreholes Hydraulic Fracturing

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Computer Modeling in Engineering & Sciences 2019年第9期120卷 779-797页

作者： Chenpeng Song Yulong Chen Jiehao Wang National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials Chongqing Jiaotong UniversityChongqing400074China Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPA 16802USA School of Energy and Mining Engineering China University of Mining and TechnologyBeijing100083China

Hydraulic fracturing has been applied to enhance CBM production and prevent gas dynamical hazard in underground coal mines in ***,affected by in situ stress orientation,hydrofracture can hardly continuously propagate within coal seam but may easily extend to the adjacent roof-floor strata,causing ineffective permeability enhancement in coal seam and increasing the risk of gas transfinite during mining ***,it is very necessary to artificially control the propagation direction of hydrofracture and make it well-aligned in large scale in coal *** this study,a method for controlling propagation direction of hydrofracture by multi-boreholes is investigated by theoretical analysis,laboratory experiment and numerical *** this is followed by an on-site test in an underground coal mine to verify this ***,stress intensity factor at the hydrofracture tip is analyzed where pore pressure is taken into *** show that the pore pressure is able to increase the stress intensity factor and reduce hydrofracture propagation *** on this,a method of hydraulic fracturing using multi-boreholes to control hydrofracture direction is ***,laboratory experiments are conducted to explore the impact of pore pressure on hydrofracture *** experimental results agree with the theoretical analysis very *** on,a series of numerical simulations are performed to examine the influence of principal stress difference,the angle between assistance drillholes and the maximum principal stress,and the fluid pressure of the assistance drillholes on hydrofracture ***,an on-site test in an underground coalmine is practiced where this proposed method is used to enhance the CBM *** show the scope of the hydro-fracture resulting from the multi-boreholes hydraulic fracturing method increases 2.7 times compared with that of conventional hydraulic *** gas production rate also i

关键词： Coalbed methane underground coalmine hydraulic fracturing pore pressure multi-borehole

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