优化板桩结构入土深度的计算分析

Optimizing the Sheet Piles Embedment Depth Calculations

针对等值梁法在基坑支护结构设计的基本理论与基本假定进行了详细的介绍。利用主、被动土压力系数之间的相关性,对其计算形式进行了转换,提出了一条土压力系数的简化公式计算入土深度,并通过某工程实际算例验证了简化公式的适用性。强调了可以通过拟合函数的单调性并结合土体的性质和状态修正板桩结构的嵌固深度,提供了科学分析的依据。采用不同方法对比分析土压力零点位置的差异对支护结构的影响,可以根据适用条件针对性的确定计算方式。

The theoretical and basic assumptions in the application of equivalent beam method in the deep excavation supporting design are introduced in this paper in detail.A conversion formula is proposed based on the correlations in the active and passive earth pressures and this formula is then introduced in simplifying the embedment depth of cantilever walls.This new approach is also verified a practical deep excavation project.In the application,the embedment depth of the sheet piles can be adjusted based on the monotonic properties of the fitting function,as well as the soil properties and state.The effect of the zero earth pressure points from various methods on the supporting structures are also analyzed.