基坑支撑刚度计算方法辨析及其对支护桩内力的影响

分析了目前常见的两种计算基坑支撑刚度方法的差异、优缺点和适用范围。通过建模,用弹性支点法分别计算分析了单道支撑和两道支撑条件下,支撑刚度变化对支撑轴力及支护桩桩身内力的影响。计算结果表明:对于单层支撑系统,随着支撑刚度的增大,支护桩的最大弯矩和剪力稍有增加,而支撑轴力的增大幅度比较明显,且当支撑刚度增大到临界值后轴力趋于稳定;对于双层支撑系统,增加支撑刚度对支撑轴力起到增大的作用,但对支护桩内力的影响却各不相同。

Calculating Methods for Stiffness of Bracing Structure and Their Influence on Internal Force of Retaining Piles

The difference of two calculating methods for stiffness of bracing structure are compared.The model for analyzing stiffness of bracing structure influence upon internal force of retaining pile is established,and some useful conclusions are obtained.The force of bracing structure becomes bigger with the increasing of its stiffness.For monolayer and two-double bracing structure,the change of moment of retaining piles is different with the increasing of stiffness of bracing structure.