Layout and support technology of entry for pillar face |
| |
| Affiliation: | 1. School of Mines, China University of Mining & Technology, Xuzhou 221008, China;2. Shanxi Huishen Coal Industry Development Co., Ltd., Xi’an 710000, China;3. Department of Petroleum and Geological Engineering, The University of Oklahoma, OK 73019, United States;1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science & Technology, Qingdao 266590, China;2. College of Mining & Safety Engineering, Shandong University of Science & Technology, Qingdao 266590, China;3. Department of Mining Engineering, Colorado School of Mines, CO 80402, USA;1. School of Mechanics and Architecture Engineering, China University of Mining & Technology, Beijing 100083, China;2. State Key Laboratory for Geomechnics & Deep Underground Engineering, Beijing 100083, China |
| |
| Abstract: | In order to improve the recovery rate of coal, some mines have begun to recover the residual protective pillars in the form of short wall faces. However, it is difficult to control stability of the haulage entry and the ventilating entry under the mining influences of the pillar face and the two side faces. Thus the 4311 face, which was designed to recover the 57 m wide residual protective pillar in Guojiashan Coal Mine,was taken as engineering background. Distribution law of stress and plastic zone in the residual protective pillar was analyzed using the numerical simulation. Then the gob-side entry driving technology was proposed to layout the entries for the pillar face. Based on the analysis of stress distribution and deformation characteristics of surrounding rocks in gob-side entry driving with different width of narrow pillars, the width of the narrow pillar of the entries in the 4311 face was decided to be 4 m. In order to control stability of the gob-side entry driving, the mechanical model of the main roof was established and deformation characteristic of surrounding rock was analyzed. Then the bolt support technology with high strength and high pre-tightening force was proposed for entry support. Especially, the hydraulic expansion bolts were used to support the narrow pillar rib. The engineering results show that the width of the narrow pillar is reasonable and the entry support technology is effective. The research achievement can provide some references to pillar recovery for other coal mines. |
| |
| Keywords: | Pillar recovery Gob-side entry driving Stability Bolt support Hydraulic expansion bolt |
| 本文献已被 CNKI ScienceDirect 等数据库收录！ |
|
