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| Study on recovering roadway anchor bolt support technology under complicated roof stress |
| Guo Wei1,2, Cui Yunjian1,2, Bu Qingwei1 |
| 1. Inner Mongolia University Of Science and Technology, Baotou 014010, China; 2. Shenhua Jungar Energy Corporation Ltd., Jungar Banner 010300, China |
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Abstract Based on the stability problem of recovering roadway surrounding rock under complicated roof stress, support of 31207 working face transportation roadway under complicated roof stress in Shigetai Mine was analyzed by site research, analysis of mechanical theory and engineering practice. No. 22 coal seam goaf and protective coal pillar existed in the overlying strata of 31207 working face transportation roadway, which led to the lowering of floor surrounding rock stress release and the increase of floor stress locally caused by sided coal pillar, the two area distributed alternatively, the surrounding rock of the roadway damaged under uneven surrounding rock stress, anchor bolt + anchor cable + double steel mesh support technology was put forward, roadway maximum displacement was 140 mm under floor stress increasing area, roadway maximum displacement 60 mm in floor surrounding rock stress release, the support technology controlled roadway surrounding rock overall bearing structure stability effectively.
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