水泥土复合式支护结构的综合刚度矩阵法

Composite Stiffness Matrix for a Mixed Retaining Structure of Soil Cement Wall and Concrete Piles

摘要:

提出一种综合刚度矩阵来描述水泥土墙钻孔灌注桩复合支护结构的抗弯性能.在平面梁单元理论的基础上，通过引入新的自由度——混凝土桩与水泥土体摩擦力作用距离，并结合平截面假定和单桩剪切位移法，建立了垂直和水平两个方向上的位移函数，推导了复合式支护结构的综合刚度矩阵.根据最小势能原理，推导时增加了对水泥土墙和内插灌注桩之间的摩擦做功以及混凝土桩拉伸弹性势能的考虑.通过工程实例进行验证，结果表明该方法可行且计算结果与监测数据吻合较好.

Abstract:

A composite stiffness matrix was proposed to describe the flexural performance of the soil cement wall and concrete piles mixed retaining structure. Based on Euler beam theory, both vertical and horizontal displacement functions were established by introducing a new degree of freedom—friction distance between concrete piles and cemented soil, and the flat section assumption and pile shear displacement method were used. Considering the potential energy generated by the friction of cement wall—concrete pile and pile tension, a composite stiffness matrix was derived. The proposed matrix was verified by an example and the displacement was in good agreement with the field data.