非关联流动法则对双线平行隧道上限解的影响分析

基于极限分析上限定理,对双线平行隧道的稳定性进行了研究。考虑非关联流动法则的影响,修正了围岩的抗剪强度,求得了隧道支护力的上限解表达式。利用Matlab数值软件,计算了支护反力最小值,并探讨了剪胀系数、埋深、洞径、间距等参数的影响,结果表明：剪胀系数η对隧道的稳定性有较大的影响,随着η的增大,支护反力非线性减小。

The Influence Analysis of Non-associate Flow Rule on the Upper Limit Solution of Two Parallel Tunnels

By modifying the shear strength coefficient of rock-soil body, the non-associate flow rule is drawed into this paper. Based on the upper limit method of limit analysis and existed researches, the reactions of two track parallel tunnel are studied and the upper limit solutions of support force are cal- culated. Using Matlab to program for computing the problem. The influence of reactions caused by factors such as dilatancy factor, burial depth, radius of tunnel and spacing is studied. The results demonstrate that dilatancy factor have a deep effect on the tunnel stability, and with dilatancy factor increasing, the support force decreases nonlinearly.