陷落柱影响区软岩巷道加固段长度及其底鼓控制研究  

Study of the reinforced supporting length and floor heave control technology of soft rock roadway influenced by collapse column

作　　者：左建平[1,2] 孙运江[1] 李楷[1] 陈岩[1] 王金涛[1] 姜广辉[1] 

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

出　　处：《中国矿业大学学报》2017年第1期18-26,共9页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51622404;51374215;11572343);霍英东教育基金会第十四届高等院校青年教师基金应用课题(142018);北京市科委重大科技成果转化落地培育项目(Z151100002815004);"十三五"国家重点研发计划(2016YFC0801404);"万人计划"青年拔尖人才联合资助项目

摘　　要：我国很多煤矿巷道受到临近陷落柱或地质构造影响.针对常村煤矿陷落柱附近-470南翼辅助运输巷底鼓严重的问题,根据弹塑性理论和Hoek-Brown准则,建立了陷落柱周围塑性破坏区力学模型,推导出陷落柱影响区巷道加固段长度计算公式.基于X射线衍射实验和朗肯土压力理论分析了陷落柱区巷道底鼓机理,提出了"适当加密锚杆+大直径高强锚索+钢筋网喷层+滞后高压注浆"的锚网喷注综合控制方案,并对其支护机理进行分析.工程实践表明,加固段长度的理论计算误差约为9.3%,巷道加强支护后底鼓量比原方案大约减小了70%~75%,实现了陷落柱影响区大断面膨胀性软岩巷道底鼓的有效控制.Many roadways are affected by the nearby collapse column or geological structure in China＇s coal mine. In order to solve the serious floor heave problem of No. -470 south auxilia- ry transportation roadway nearby the collapse column in Changcun coalmine, a mechanical model of plastic failure zone around collapse column has been proposed according to elastic- plastic mechanics and Hoek-Brown criterion. In addition, a theoretical reinforced supporting length formula was also derived. The floor heave mechanism of roadway near collapse column was analyzed based on X-Ray diffraction experiment and Rankine＇ s earth pressure theory. Then the integrated supporting scheme of ＂reasonable bolt spacing ＋high-strength anchor ca- ble ＋ mesh reinforcement spray concrete ＋ delayed high pressure grouting＂ was put forward based on the analysis of supporting mechanism. Field test results show that the relative devia- tion of theoretical reinforced supporting length is 9. 3% and the floor heave decreased by 70%-75% after using the integrated supporting scheme. The serious floor heave of large sec-tion soft rock roadway influenced by collapse column can be effectively controlled.

关 键 词：陷落柱 膨胀性软岩 底鼓 X射线衍射 HOEK-BROWN准则 加固段长度 

分 类 号：TD353[矿业工程—矿井建设]