关键层厚度对大断面巷道稳定性影响研究  

Research on effect of key strata thickness on stability of large-section roadway

作　　者：左建平[1,2] 赵洪宝[1,3] 张国彬[2] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京市海淀区100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京市海淀区100083 [3]中国矿业大学(北京)资源与安全工程学院,北京市海淀区100083

出　　处：《中国煤炭》2013年第2期45-47,共3页China Coal

基　　金：国家重点基础研究发展计划(973)资助项目(2010CB732002);北京市科技新星计划(2010B062);国家自然基金项目(11102225);教育部新世纪优秀人才支持计划(NCET-09-0726)资助

摘　　要：岩层关键层对大断面巷道围岩的变形破坏起着决定性的作用。以五阳矿7602综采面为地质模型,通过不连续变形数值方法,模拟分析了主关键层厚度对大断面巷道的变形影响。研究表明,大断面巷道存在一个临界关键层厚度,当关键层厚度超过这个临界值时,巷道的变形很小,可不采取加固措施;但当关键层厚度小于该临界值时,巷道围岩存在一定变形,严重时需要采取加固措施。五阳煤矿的老顶只有8m左右,需采取相应的加固措施;类似于五阳煤矿相似地质条件的大断面巷道,如果要保持稳定,临界关键层厚度应该达到12m左右。The key stratum of rock has decisive function on deformation and failure of surrounding rock of large section roadway. Taking 7602 fully mechanized mining face of Wuyang Mine as the geological model, with discontinuous deformation numerical method, the paper simulates and studies the effect of main key stratum thickness on deformation the large section roadway. The research results show that there is a critical thickness of key strata in large section roadway. When the key strata thickness exceeds the critical value, the deformation of roadway will be very small, and it need not take any reinforcing measures; however, when the key strata thickness is less than the critical value, large deformation will emerge in roadway surrounding rock, and it needs to adopt reinforcing measures. The thickness of main roof in Wuyang Mine is only about 8 meters, and the corresponding reinforcing measures are necessary. Any large section roadway with similar geological conditions with Wuyang, the critical thickness of key stratum should be about 12 meters to maintain the roadway stability.

关 键 词：关键层厚度 DDA数值模拟 大断面巷道 稳定性 

分 类 号：TD322[矿业工程—矿井建设]