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在支挡结构稳定性设计中,基于侧向土压力系数的设计方法简单易用,一直被广泛用于实际工程中。已有侧向土压力系数主要在平面应变分析方法下计算获得,忽略了三维空间效应的影响。基于三维边坡稳定分析方法,采用变分法获得安全系数极值下对应的三维破坏机制,建立考虑三维效应的砌块土坡侧向土压力计算方法,从而揭示三维效应对砌块土坡侧向土压力大小的影响规律。提出的方法还考虑了砌块与土摩擦作用力和水平地震力的影响。给定参数值,通过优化计算获得了不同长高比下的三维砌块土坡水平土压力系数,以图的形式给出便于使用。从计算结果可以发现,在地震作用下,三维空间效应对侧向土压力的影响显著,特别是对于垂直的支挡结构。最后结合算例,通过与传统的平面应变下侧向土压力结果进行对比分析,显示了考虑三维效应的土压力系数对支挡结构稳定性设计的重要性。
In the design of support structure stability, the design method based on lateral earth pressure coefficient is easy to use and has been widely used in practical engineering. The existing lateral earth pressure coefficient is mainly calculated under the plane strain analysis method, ignoring the influence of the three-dimensional space effect. Based on the three-dimensional slope stability analysis method, the corresponding three-dimensional failure mechanism under the safety factor extremum is obtained by using the variational method, and the lateral earth pressure calculation method is established to consider the three-dimensional effect. Therefore, The influence of earth pressure on the law. The proposed method also takes into account the influence of block friction with soil friction and horizontal seismic forces. Given the values of the parameters, the horizontal soil pressure coefficient of the three-dimensional block soil slope under different aspect ratios is obtained through optimization calculation, which is easy to use in the form of a graph. From the calculation results, it can be found that under the action of earthquake, the three-dimensional space effect has a significant influence on the lateral earth pressure, especially for the vertical support structure. Finally, by comparing with the results of the lateral earth pressure under the traditional plane strain, a numerical example is given to show the importance of the earth pressure coefficient considering the three-dimensional effect on the stability design of the retaining structure.