软弱地基上齿坎式挡土结构物抗滑特征分析

【目的】探讨齿坎式挡土结构物与墙后填土共同作用下的抗滑特征，为齿坎式挡土结构物的计算与设计提供参考。【方法】基于强度折减有限元法，通过变换参数与改变挡土墙构型，分析齿坎的作用机理与影响因素。【结果】软弱地基上齿坎式挡土结构物的滑裂面为一通过底板及齿坎后缘的近似圆弧面；齿坎的设置有最小长度的限制，其长度应能够穿越原有的滑裂面，从而可影响或改变原有滑裂面的形状并发挥作用；相同齿坎长度时，后齿布置方式的安全系数最大，而前齿布置方式的安全系数最小；随着齿坎长度的增加，挡土结构物的安全系数增大。【结论】合理设置齿坎的长度与位置，有助于提高挡土结构物的稳定性。

Character of retaining structure with tenon on weak foundation

【Objective】 In order to make some references for calculating and designing the retaining structure with tenon,the character and stability of retaining structure with tenon and filling are studied.【Method】 Based on shear strength reduction FEM,the mechanism and influencing factor of tenon has been discussed by changing the parameters and format of tenon comparatively.【Result】 It is shown that the slip surface of retaining structure with tenon on weak foundation is an approximate arc surface below soleplate.The effect of tenon depends on its length which should be long enough to go through the original location of slip surface.With the same length of tenon,the stability of retaining structure would be enhanced maximally when tenon is located at the rear of soleplate,and which would be enhanced minimally when tenon is located at the front of soleplate.The stability of retaining structure would be enhanced as the length of tenon increases.【Conclusion】 The stability of retaining wall can be improved by using tenon with reasonable length and location.