【摘要】 破碎围岩巷道的变形与失稳行为很复杂,巷道围岩局部变形易引起破坏失稳,而理论计算得到的支护参数与工程实际相差甚远。基于现场调查,通过表面变形与深部离层规律综合监测,深入分析了复杂地质条件下松软破碎围岩局部变形与演化失稳机理。监测表明:巷道开采深度较大时,围岩变形情况比较复杂,煤层裂隙发育,巷道顶底板和两帮变形大;巷道积水造成底鼓时,因现有的支护方式不适应围岩非线性、大变形的要求,而必然导致支护失效。研究成果对回采巷道支护方案的选择具有重要的借鉴作用,为工程防灾和减灾提供了科学依据。更多还原

【Abstract】 The crushed rock-mass′s failure behavior and process is complex and the crushed rock-mass will be destroyed and instabilized,but the support parameter from theory calculation is different from filed engineering.Based on field geologic investigation,the mechanism analysis of part deformation and instability in complex soft and crushed rock-mass condition is accomplished through monitor of surface deformation and deep deformation.The analysis indicates that the rock-mass deformation is complex condition because the mining depth is big.The fracture of coal is developed and the deformation of roof and working slope is big,floor is protruded because of entry water.The support way can′t meet the requirement of rock-mass nonlinearity and big deformation character and must lead to support lose efficacy.The study achievement is referential for support way in mining entry choosing,and provides a scientific proof for hazard prevention.更多还原