考虑岩体损伤和注浆加固效应的单元稳定性

Element stability of rock mass considering its damage and reinforcement effect by grouting

为了研究注浆对节理岩体损伤的加固效应,从微观角度出发,引入岩体修复因子的概念,构建考虑岩体损伤和注浆加固效应的单元安全系数,以判断岩体的稳定性;然后,利用FLAC3D软件建立数值计算模型,采用FISH语言二次开发单元安全系数程序,得到隧道开挖后围岩不同部位的单元安全系数,将其与FLAC3D软件所得的的塑性区分布进行对比。研究结果表明:单元安全系数Fs≤1的区域与FLAC3D计算得到的塑性区分布范围一致,验证了所推导的单元安全系数计算公式以及自编程序的正确性。

In order to study the reparation effect of grouting in jointed rock mass,the repairing factor was introduced in microscopic way to the analysis for jointed rock mass,the element safety factor of tunnel rock mass considering the damage and reinforcement effect was founded to study the stability state of rock mass.The numerical calculation software FLAC3D with the internal FISH program was adopted to compile the program for the element safety factor of tunnel rock mass to obtain the element safety factor for different areas of rock mass after tunnel excavation,and the results were compared with those from the plastic zone distribution.The results show that the area of element safety factor Fs≤1 and the area of plastic zone distribution calculated by FLAC3D are almost the same,which validates the correctness of the deduced equation for the element safety factor based on the Barton criterion parameters and the program built.