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基于非关联流动准则和极限分析上限理论,通过构建浅埋隧道的简单破坏模式,推导了非关联流动准则下浅埋隧道围岩压力的计算公式。基于内外能耗守恒原理,结合强度折减技术对一定围岩压力下浅埋隧道稳定性进行了分析,并应用非线性优化方法,得出了浅埋隧道围岩压力和一定围岩压力下浅埋隧道稳定性上限解析的优化解答。研究结果表明:岩土材料的剪胀特性和围岩侧压力系数均对浅埋隧道和稳定性有较大影响,且岩土侧压力相关系数对浅埋隧道稳定性的影响程度更为显著。
Based on the unassociated flow rule and the upper bound theory of limit analysis, the formula of surrounding rock pressure of shallow tunnel under the unassociated flow rule is deduced through the simple failure mode of constructing shallow tunnel. Based on the principle of internal and external energy conservation and the strength reduction technique, the stability of shallow tunnel under a certain surrounding rock pressure is analyzed. The nonlinear optimization method is used to find the stress of surrounding rock in shallow tunnel and the shallow of surrounding rock pressure Optimum Solution of Upper Bound Analysis of Buried Tunnels. The results show that both the dilatancy characteristics of rock and soil materials and the lateral rock pressure coefficients have a great influence on the stability of shallow tunnels, and the influence of rock lateral pressure correlation coefficient on the stability of shallow tunnels is more significant.