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| Optimization and control technology of coal pillar width in gob-side entry driving in soft coal with thick and hard basic roof |
| Lv Feng |
| Dongpang Mine, Jizhong Energy Resources Group Co., Ltd., Xingtai 054201, China |
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Abstract Based on the engineering background of No.21221 fully mechanized mining face in Dongpang Mine, multiple methods such as theoretical calculation, numerical analysis and field practice were used to study the failure law of overlying strata and the failure mechanism of roadway surrounding rock. The width of narrow coal pillar in gob-side entry driving along thick and hard basic roof of soft coal was determined to be 7 m, and its support technology and mechanism were studied in depth. The results showed that : 1 the theoretical calculation showed that the reasonable width range of narrow coal pillar was 4.94-8.1 m ; 2 The numerical simulation results showws that when the size of coal pillar was 7-9 m, the plastic zone area of surrounding rock above coal pillar and roadway decreased, and the range of elastic core area expanded, which was beneficial to the anchoring of bolt cable in roof. The engineering practice showed that the comprehensive control technology of 7 m narrow coal pillar and soft coal gob-side roadway could effectively control the large deformation of roadway surrounding rock, and the roadway section met the requirements of use.
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