巷道围岩挤压位移模型及位移量化分析方法  

Extrusion displacement model and displacement quantization method of roadway surrounding rock

作　　者：张农[1,2] 王晓卿[1] 阚甲广[1] 史英男 王龙江[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 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《中国矿业大学学报》2013年第6期899-904,共6页Journal of China University of Mining & Technology

基　　金：长江学者和创新团队发展计划项目(IRT1084);江苏省自然科学基金项目(BK2012570)

摘　　要：为确定巷道围岩内部零位移点的位置,解释零位移点以深围岩发生位移的现象,建立了巷道围岩挤压位移模型,并分析了深表比变化规律.结果表明:支承压力是零位移点以浅围岩产生位移的力学动因,从巷道表面至零位移点处深表比从1逐渐降至0;原岩应力在水平和竖直方向的应力差是零位移点以深围岩产生位移的力学动因,围岩深部存在原始离层或软弱岩层是其发生条件,若存在原始离层,则零位移点以里深表比逐渐增大;若存在软弱岩层,则零位移点以里深表比先增大后减小;对比分析相同位置的表面位移及多点位移观测值,可以量化围岩位移,确定零位移点位置,以此原理设计出深表位移测量仪,并成功应用到工程实践,验证了巷道顶板零位移点,并用于修正锚杆支护参数设计.In order to determine zero-displacement point position and explain displacement phe- nomenon of roadway surrounding rock inward zero-displacement point, surrounding rock ex- trusion displacement model was established. The variation law of depth-surface ratio was ana- lyzed. The results show that abutment pressure is the mechanical motivation of surrounding rock displacement outward zero-displacement point. The depth-surface ratio gradually decrea- sing from 1 to 0 from roadway surface to zero-displacement point position. The stress differ- ence of horizontal and vertical direction is the mechanical motivation of surrounding rock dis- placement inward zero-displacement point whose occurrence condition is the existence of origi- nal bed separation or soft rock in deep surrounding rock. If existing original bed separation, the depth-surface ratio gradually increases. If existing soft rock, the depth-surface ratio increa- ses first, and then decreases inward zero-displacement point. Comparative analysis of observa- tions of surface displacement and multi-point displacement in the same position can quantify rock displacement and determine the zero-displacement point position, based on which, depth- surface displacement measuring instrument was designed. The depth-surface displacement measuring instrument was successfully applied to engineering practice to verify zero-d!splace- ment point in roadway roof and correct bolting parameters design.

关 键 词：挤压位移 深表比 零位移点 位移量化 

分 类 号：TD353[矿业工程—矿井建设]