深井高应力巷道围岩锚注加固支护技术
Bolting and Reinforcing Technique of Surrounding Rock in Deep Well Roadway with High Stress
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摘要: 主动支护方式是控制深部巷道围岩的主要支护方式,但是对于深井高应力巷道,普通锚杆支护控制巷道围岩的效果不佳。为提出围岩加固效果良好的复合支护技术,以新巨龙煤矿2305N下平巷为工程背景,研究了深井高应力巷道围岩锚注加固支护技术;通过理论分析、数值模拟和现场观测的方式研究锚杆的最佳参数和浆液的最佳配比。结果表明:锚杆的最佳长度为2 500 mm,锚杆最佳间排距为1 000 mm×1 000 mm;浆液最佳水灰比为0.5,注浆加固层最佳厚度为1 800 mm。通过现场观测得出巷道最大顶底板变形量和最大两帮变形量均在允许的范围内,该锚注加固支护方案合理。Abstract: The active support method is the main support method for controlling the surrounding rock of deep roadway. However, for deep and high stress roadways, the effect of ordinary bolt support on controlling surrounding rock of roadway is not good. To propose the composite support technology with good reinforcement effect, the 2305N lower roadway of Xinjulong Coal Mine was taken as the engineering background. And the surrounding rock anchoring and reinforcement support technology for deep and high stress roadway was studied. The optimal parameters of the anchor and the optimal ratio of the slurry were studied by theoretical analysis, numerical simulation and on-site observation. The results showed that the optimal length of the anchor was 2 500 mm. The optimal spacing between the bolts was 1 000 mm×1 000 mm. The optimum water-cement ratio of the slurry was 0.5. The optimum thickness of the grouting reinforcement layer was 1 800 mm. Through on-site observation and monitoring, it was found that the maximum deformation of the top and bottom of the roadway and the maximum deformation of the two sides were within the allowable range. The anchoring and reinforcement support scheme was reasonable.
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