m法和有限元法对桥梁桩基的计算探讨

Discussion on Calculation of Bridge Pile Foundation by M Method and Finite Element Method

摘要:

通过简述桩基m法的计算过程，分别使用m法和有限元法计算了单桩算例和群桩算例，得到了两种算例下桩基位移、桩身弯矩、桩身剪力和桩周土应力的计算结果，发现m法和有限元法在计算的桩身各反应结果差距均较小，且除桩周土应力外，其他反应结果趋势基本一致。另外，还分析了两种方法在桩基入土深度z≥4.0/α时桩基位移和桩周土应力结果差异的原因。

关键词:桩基;Winkler地基模型;m法;有限元法

Abstract:

By briefly describing the calculation process of pile foundation by M method, the single pile example and the group pile example are calculated respectively by M method and finite element method to obtain the calculation results of pile displacement, pile bending moment, pile shear force and pile surrounding soil stress under two kinds of calculation examples. It is found that the difference between M method and finite element method in the calculation of each pile response result is small, and the trend of other response results is basically the same except the pile surrounding soil stress. In addition, the reasons of the difference between the results of pile foundation displacement and soil stress around the pile when the pile foundation depth into soil is z ≥ 4.0 / α by two methods are analyzed.

Key words:pile foundation, Winkler subgrade model, M method, finite element method