扩底补填对防止煤巷树脂锚杆滑移失效的试验研究
Experimental study on preventing slippage failure of resin bolt in coal roadway by backfilling with enlarged bottom
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摘要: 采用数值模拟研究扩底补填锚固系统各部件的位移、应力分布状态,结合现场试验对比分析扩底反充锚固与正常锚固相比对控制巷道变形、提高锚固能力的情况。数值模拟结果表明:扩孔最大直径越大,锚杆轴向稳定力越大,锚固系统越稳定;以施加轴向载荷150 kN为例,扩底补填锚固时钻孔围岩的最大应力值是正常锚固的2.9倍,扩底补填锚固时锚固剂的最大应力值是正常锚固的2.8倍,围岩和锚固剂的变形均小于正常锚固;5倍以上的扩底补填锚固各部件位移变化量基本相等,得出5倍扩底补填锚固的可行性最好。现场试验结果表明,扩底补填锚网支护的顶板变形总量、变形速率均小于正常支护,锚固系统的锚固能力提高了2.1倍,扩底补填对防止煤巷树脂锚杆滑移失效效果明显。Abstract: This paper adopts numerical simulation to study the displacement and stress distribution states of each component of the bottom-expanding filling anchorage system, and analyzes the change of controlling roadway deformation and improving anchorage capacity of backfilling anchorage of bottom-expanding filling system compared with normal anchorage by combining with field tests. Numerical simulation results show that the larger the maximum diameter of reaming is, the greater the axial stabilizing force is and the more stable the anchoring system is. Taking the axial load of 150 kN as an example, the maximum stress value of the borehole surrounding rock is 2.9 times that of the normal anchorage when the bottom is enlarged and the anchorage is filled. The maximum stress value of anchoring agent is 2.8 times that of normal anchoring during filling anchorage with bottom expansion. The deformation of surrounding rock and anchoring agent is less than that of normal anchoring. The displacement variation of each part is basically the same for more than five times of filling and anchoring, it is concluded that the five-fold expansion of the bottom is the most feasible. The results of field test show that the total amount of roof deformation and the deformation rate are smaller than the normal support. The anchoring capacity of the anchoring system increased by 2.1 times.
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Keywords:
- coal roadway /
- resin bolt /
- bottom expansion and filling /
- slip failure /
- numerical simulation /
- roadway support
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