摘要
重力式挡墙的地震稳定性分析一般基于线性摩尔库伦准则。然而,试验表明,大多数岩土材料的破坏包络线具有明显的非线性特性。本文通过斜条分法,建立了挡墙在地震作用下绕趾转动破坏模型,推导了土-墙系统外功速率与内部能量耗散平衡方程。利用正切方法引入等效抗剪强度参数,并通过优化算法,得到了非线性屈服准则条件下地震屈服加速度系数的最优上限解。与现有文献结果进行对比,验证了本文方法的有效性。参数分析表明,非线性系数对挡墙地震屈服加速度系数和临界破裂角具有显著影响,特别是土-墙界面与填土摩擦角比值n较大和竖向与水平地震系数比值ψ较小的情况下。在挡墙地震稳定性分析中,应考虑土体强度非线性的影响。
Seismic stability analysis of gravity retaining walls is generally based on linear Mohr-Coulomb yield criteria.However,experiments show that the failure envelope of most geotechnical materials has obvious nonlinear characteristics.In this paper,the damage model of pure rotating retaining wall under seismic action is established by the inclined strip method,and the balance equation of external work rate and internal energy dissipation is derived.The equivalent shear strength parameter is introduced by tangent method,and the optimal upper limit solution of seismic yield acceleration coefficient under nonlinear yield criterion is obtained by optimization algorithm.The effectiveness of the proposed method is verified by comparison with the results of existing literatures.The parametric analysis shows that the nonlinear coefficient has significant influence on the seismic yield acceleration coefficient and critical rupture angle,especially when the ratio n of the soil-wall interface friction angle and the internal friction angle is large and the ratio of the vertical seismic coefficient to the horizontal seismic coefficient is small.The nonlinear influence of soil strength should be considered in seismic stability analysis of retaining wall.
作者
刘杰
宋家乐
白佳豪
Liu Jie;Song Jiale;Bai Jiahao(School of Civil Engineering,Hebei University of Engineering,Handan 056000,China)
出处
《建筑科学》
北大核心
2025年第5期75-83,共9页
Building Science
关键词
非线性屈服准则
地震旋转稳定性
极限分析上限法
重力式挡土墙
地震屈服加速度系数
nonlinear yield criterion
seismic rotation stability
upper-bound limit analysis method
gravity retaining wall
seismic yield acceleration coefficient
