深井矩形巷道围岩预应力锚固作用及演化分析  

Pre-stressed anchorage function and evolution in the roof of rectangular roadway in deep mine

作　　者：郑西贵[1] 张磊 张农[1] 刘娜[1] 

机构地区：[1]中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2013年第6期929-934,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金青年基金项目(51104152);长江学者和创新团队发展计划(IRT1084)

摘　　要：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.According to some problems of anchoring mechanism in deep coal roadway roof, the calculate formula of Hoek-Brown constitutive model was gained based on stress analysis to the rectangular roadway. With the simplified Hoek-Brown constitutive model, the effect of the an- choring system under different prestressing force in the roadway roof was analyzed by software FLAC3D. The optimal preload value under different rock conditions was obtained. Anchorage element affected by roadway drivage dynamic load is calculated adopting the model of dynamic response calculation. The results show that within the range of 5 m road excavated, all bolts are exposed to a number of dynamic load effects. The bolt axial force increment which located in the central roof is 1.95 times than that located in the edge of roof. The incremental in ancho- ring section accounts for 84% of the total. We also find that anchoring agent can absorb some dynamic wave.

关 键 词：预应力锚固 Hoek-Brown本构模型 巷道顶板 FLAC3D 

分 类 号：TD353[矿业工程—矿井建设]