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针对煤矿深部巷道顶板锚固作用机理认识上所存在的问题,基于矩形巷道受力分析得出Hoek-Brown本构模型计算公式.在对Hoek-Brown本构模型简化的基础上,采用FLAC3D数值模拟软件,分析了在不同预紧力作用下锚固系统对巷道顶板的作用,得出了在不同围岩条件下的最佳预紧力值.采用动态响应计算模式对锚固单元受巷道掘进动载影响进行计算,结果表明在巷道掘出5m内,锚杆均承受了多次动载影响,顶板中部锚杆轴力增量为边角锚杆的1.95倍,锚固段增量占总增量的84%,锚固剂可以吸收较多动力波.
Aiming at the existing problems in the mechanics of roof anchoring in deep mine roadways, Hoek-Brown constitutive model calculation formula is derived based on the analysis of mechanical behavior of rectangular roadway.Based on the simplification of Hoek-Brown constitutive model, FLAC3D numerical simulation software , Analyzes the effect of anchoring system on roof of roadway under different pretensioning force and obtains the optimum pre-tightening force under different surrounding rock conditions.Using the dynamic response calculation model, the influence of anchoring unit on the dynamic behavior of roadway driving The results show that under the excavated roadway 5m, the rock bolts are subjected to multiple dynamic loads. The axial force of rock bolts in the middle of the roof is 1.95 times of that of the rock bolts, and the increment of anchorage section accounts for 84% of the total increment. Agents can absorb more power waves.