翼墙式隧道洞门抗滑移整体式计算方法研究

Research on the Integral Calculation Method of Slipping Stability of Wing Wall Tunnel Portal

研究目的：针对条带法在计算翼墙式隧道洞门抗滑移稳定性中存在的问题（忽略洞门的整体性及侧向土体的摩阻作用，导致计算结果过于保守），本文将隧道洞门视为整体结构，提出翼墙式洞门抗滑移的整体式计算方法。该方法考虑洞门各部分之间的相互作用及端墙周围侧向土压力的摩阻作用，采用积分的方法计算作用在洞门上的滑移力与抗滑力，并得出安全系数。研究结论：（1）与传统条带法相比，采用整体法计算的抗滑移稳定性系数大于传统条带法所得的计算值，其稳定性系数约为条带法计算结果的1．2～1．5倍；（2）采用条带法计算某些安全结构时得出的抗滑移安全系数小于规范中的容许值，说明条带法还有待改进；（3）整体法可用于翼墙式隧道洞门的抗滑移计算研究，计算结果可靠，在保证安全的前提下更加经济。

Research purposes： Aim at the problems of the slipping stability of wing wall tunnel portal by the strip method, which leads to the result excessively conservatism because friction of soils, the integral method was put forward in this pape Considered the interaction between the various parts of the portal surrounding side wall, the slip force and stabilizing force acted on the the factor of the slipping stability was analyzed. neglecting the integrity of r by regarding the portal and the friction effect of tunnel portal and the as integral structure. lateral earth pressure portal was calculated by the integral method, Research conclusions： （ 1 ） The slipping stability factor obtained in the integral method is larger than the strip method, and the former is about 1. 2 - 1. 5 times of the latter. （2） Sometimes the slipping stability factor obtained in the strip method cannot attain the standard values for some reliable structures, which indicates that the strip method is excessively conservative and necessary to improve. （3） The integral method can be applied in the slipping stability design of wing wall tunnel portal in the engineering practice, and the result is reliable. Under the premise of ensuring safety, the integral method is more economical than the strip method.