考虑岩体峰后非线性软化的衬砌压力隧洞应力解

采用弹性－塑性非线性软化―裂缝区三阶段围岩模型，根据全量理论将真实岩体单轴应变非线性软化特征推广，得到复杂应力状态下岩体等效应力和等效应变关系，在此基础上对衬砌压力隧洞在等压荷载作用下进行弹塑性分析。推导出了围岩裂缝区、塑性软化区、弹性区和衬砌内任一点的应力与位移的解析计算式，得到了衬砌边缘岩体开始产生塑性变形的临界内压力。该解析式具有广泛的适用性，基于理想塑性介质的解答如Kastner解和完全脆性介质的解答均为特例。

Stress solution of pressure on tunnel liner considering nonlinear softening of rock mass post-peak

The elastoplastic nonlinear softening-cracking area of surrounding rock model is analyzed.According to the entire theory,the relationship between equivalent stress and strain is deduced from uniaxial compression.Analytic formula of stress distribution and displacement in cracking area of surrounding rock.plastic softened zone and elastic zone are derived.The critical pressure that leads to yield caused by inner pressure is obtained.The analytic formula is applied x widely;and the solutions of Kastner and fu...