深部岩巷在动力扰动下的破坏机理分析

Mechanism analysis on failure of deep rock laneway under dynamic disturbance

结合某巷道工程实例,利用新开发的动态版岩石破裂过程分析系统RFPA2D分析了动力扰动对深部岩巷破坏过程的影响,从细观角度分析了不同深度或受不同静压力的岩石巷道在动力扰动下的破坏规律.结果表明,对于不同埋深的巷道,所受应力状态不同,则所处稳定状态也不同.当巷道埋深较小时,处于较稳定状态;当巷道埋深较大时,越来越接近临界稳定状态,较小的扰动便可以导致裂纹的大规模瞬时动力扩展,诱发巷道的失稳破坏,并伴随着应变能的高速释放.深部巷道所受静压较大,在动力扰动下比浅部巷道更易发生失稳破坏.

Combining an example of laneway engineering, numerical code RFPA2D （ dynamic simulate the failure process of rock laneway under dynamic disturbance, analyzing the failure laneway experiencing low static stress and high static stress from the view point of mesoscopic version） was used to mechanism on rock damage mechanics The results show that rock laneway is in the different State of stability when rock is in the different depth of ground, i. e. , rock laneway is stable when it is in the low depth of ground; rock laneway is close to or in the critical state of stability when laneway is in the larger depth of ground, and the less disturbance may cause fractures dynamic expansion instantaneously and cosmically, leading to the laneway losing stability, in the meantime, with much strain energy releasing fast; the occurrence of losing stability is easier in deep rock laneway which is on the condition of high ground stress than that in low rock laneway.