基于双剪强度理论的岩溶隧道掌子面防突厚度分析

Analysis of Anti-burst Thickness for Karst Tunnel Face Based on Twin Sear Strength Theory

为了解决岩溶隧道在富水溶腔压力作用下的掌子面的防突厚度问题,文章采用双剪强度理论与极限分析上限法,考虑中主应力对掌子面防突厚度的影响,建立了掌子面受力屈服破坏的理论分析模型,对隧道掌子面的极限承载力和防突厚度进行了理论计算,并结合工程实例验证了该理论分析方法的合理性与适用性。

In order to solve the anti-burst thickness problem of karst tunnel face under the pressure of water-rich cavity,by using the twin shear strength theory and upper limit method,and considering the influence of intermediate principal stress on the anti-burst thickness of tunnel face,this article established the theoretical analysis model for the forced yield failure of tunnel face,conducted the theoretical calculation on the ultimate bearing capacity and anti-burst thickness of tunnel face,and verified the rationality and applicability of this theoretical analysis method by engineering examples.