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| Study on reasonable width of small coal pillar in high stress environment of mabao coal industry |
| Yue Pengfei1, Zhang Zhenggang2 , Yan Xunqiang3, 4 |
| 1. Shanxi Mabao Coal Co., Ltd., Changzhi 046300, China; 2. Shanxi Sanyuanfuda Coal Co., Ltd., Changzhi 046300, China;
3.China Coal Technology and Engineering Group Shenyang Research Institute, Fushun 113122, China;
4.State Key Laboratory of Coal Mine Safety Technology, Fushun 113122, China |
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Abstract The reasonable width of small coal pillar is the key to the realization of small coal pillar mining technology. No.15202 Face was taken as the research object and the reasonable width of coal pillar was studied by means of borehole peeping, coal and rock physical and mechanical test, theoretical analysis and numerical simulation. The results showed that when the width of coal pillar was 6 m, the horizontal peak value of vertical stress was low, the influence degree of upper sidewall was low, and the influence range of maximum horizontal stress of floor was small. Finally, the reasonable width of coal pillar was determined to be 6 m.
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