冠梁水平侧向刚度对桩锚支护体系内力和变形的影响分析

摘要

通过某基坑工程实例，分析了冠梁水平侧向刚度对桩锚支护内力和变形的影响。结果表明，桩身最大剪力、第二道和第三道锚索轴力对冠梁水平侧向刚度不敏感，而桩身位移、桩身弯矩和第一道锚索轴力等对冠梁水平侧向刚度较敏感，其中第一道锚索轴力最敏感，其次为桩身弯矩和桩身位移。提升第一道锚索位置将显著降低桩身位移和弯矩及第一道锚索轴力对冠梁水平侧向刚度的敏感性。本文得出的一些结论对基坑工程设计有一定的指导意义。%The internal force and deformation of pile-anchor supporting system influenced by stiffness of top-beam is analyzed through one foundation pit. The result shows that the maximum shear force of pile,and axial force of the second and the third anchor cable is not sensitive to the stiffness of capping beam,but the displacement and bending moment of pile,and the first axial force of anchor cable is more sensitive to it. Especially,the axial force of the first anchor cable is the most sensitive to it,the displacement and bending moment of pile is the second. Lifting the position of the first anchor cable will significantly reduce the sensitivity of the displacement and bending moment of pile and the axial force of the first anchor cable to the stiffness of capping beam. Some conclusions obtained in this paper provide reference to the design of foundation pit.