中文摘要：

采用非线性破坏准则并结合非关联流动法则,基于构建的对数螺旋破坏机制,对深埋盾构隧道掌子面的稳定性进行了极限分析,并推导了支护力的上限解。利用数值优化方法,计算得到了特定参数下支护力的最优解。结果表明：剪胀系数和非线性系数对支护力和破坏机制有较大影响,建议在实际工程中考虑岩土材料的非线性和非关联特性。

英文摘要：

The nonlinear Mohr-Coulomb failure criterion combined with non-associated flow rule was adopted to make ultimate analysis lor the stability ol shield tunneling working lace,based on the constructed log-spiral failure mechanism, and upper bound solution of the supporting force was deduced. Through numerical optimization,the optimal supporting force corresponding to certain parameters was obtained. Analysis showed that dilatancy coefficient and nonlinear coefficient have great influences on the supporting force and failure mechanism. It is suggested that the nonlinear failure criterion and non-associated flow rule should be taken into consideration in practical engineering.