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重力式挡土墙在地震作用下的稳定性一直是岩土工程研究的热点问题。将墙前填土、墙后填土、挡墙三者看作统一体系,假设无黏性填土材料服从莫尔库仑破坏准则,根据极限分析上限理论,研究了重力式挡墙在地震作用下的纯转动稳定性。基于纯转动破坏假设,得到考虑墙前填土作用下地震屈服加速度及破裂面倾角的计算公式,并得到了屈服加速度系数的最优解。计算结果与Mononobe-Okabe法的计算结果一致,验证了该方法的合理性。地震屈服加速度系数kcr随挡墙前后填土高度比(H2/H1)的增大而增大,特别是当高度比大于0.15后,kcr随H2/H1增大呈较快速地增加。故适当增加墙前填土高度,可有效地提高挡墙地震作用下的转动稳定性。
The stability of gravity retaining wall under earthquake action has been a hot issue in geotechnical engineering. According to the upper limit theory of limit analysis, the gravity retaining wall under earthquake action is assumed to be a unified system. Supposing that the non-viscous filling material obeys the criterion of Mohr-Coulomb failure, Pure rotational stability. Based on the assumption of pure rotation failure, the formula of yield acceleration and rupture angle considering the earthquakes is obtained, and the optimal solution of yield acceleration coefficient is obtained. The calculation results are consistent with those of the Mononobe-Okabe method, which proves the rationality of the method. The kcr of earthquake yielding increases with the increase of H2 / H1 ratio, especially when the height ratio is greater than 0.15, kcr increases rapidly with the increase of H2 / H1. Therefore, properly increasing the height of the filling wall before the wall can effectively improve the rotational stability of the retaining wall under earthquake action.