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| Numerical simulation analysis of support of auxiliary haulage roadway under the condition of water bearing strata in Lijiata Mine |
| Dang Hongjian1,2, Duan Jun1 |
1. Inner Mongolia University of Science and Technology, Inner Mongolia Baotou 014010, China;
2. Inner Mongolia Lijiata Mine, Erdos 017209, China |
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Abstract Mining in roadway often encounters underground water-bearing rock strata, due to water-bearing coal rock body weakens their own load-bearing strength, resulting in roadway safety hazards. In order to address the stability of the water-bearing rock layer conditions of the roadway perimeter, this paper combined with the Lijata Mine No. 2 coal seam auxiliary transportation with water-bearing rock layer conditions, through numerical simulation and comparison of water-bearing rock layer conditions and waterless conditions of the roadway perimeter force damage characteristics, and then the water-bearing rock layer conditions of the roadway perimeter rock support control program was analyzed. The analysis showed that the water-bearing rock layer conditions on the roadway perimeter stress concentration peak size of the impact without significant difference, but the two led to a significant increase in the depth of stress damage to the perimeter; water-bearing rock layer conditions under the anchor support effect was limited, should not increase the anchor support density excessively, should focus on taking the anchor suspension support given priority to, and pay attention to the anchor suspension anchoring system load stability; The joint support scheme of "prestressing high-strength anchor + anchor cable coordinated support + concrete spraying" can play a supporting and stabilizing role in controlling the perimeter rock of the roadway under water-bearing rock layer conditions.
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