基坑开挖对既有桥梁桩基的数值分析

摘要

The two central issues during the process of pit excavation are the adverse effects brought up by excavation-induced soil deformation on adjacent piers , and the additional stress , displacement and bend moment of pile foundation caused by the interaction between pile foundation and earth .With refer-ence to engineering projects , the 3D FEM was established using GTS software .On the basis, the interac-tion between pit excavation and pile , including the displacement of pit supporting structure , surface sub-sidence and the pile bending moment changing characteristics , was analyzed.Besides, the calculation re-sults were compared with the measuring results .%基坑开挖时关注的问题是土体侧向位移对邻近桥梁桩基的不利影响，桩土相互作用引起桩基产生附加应力和附加位移以及弯矩。结合具体工程实例，运用GTS软件建立基坑开挖三维数值模型，分析了基坑开挖时土与桩基的相互作用，包括基坑围护结构和桥梁桩基的变形与应力变化以及桩身的弯矩变化特性，同时进行了计算结果与实测比对。