独立扩展基础地基反力的数值分析

Numerical Analysis on Subgrade Reaction of Independent Spread Foundation

采用有限元方法建立典型独立扩展基础-岩土体共同作用数值模型,分析其在粉砂、黏土和泥岩三种典型地基上的基底反力分布规律,指出了地基土特性和基础地基相对刚度是地基反力分布模式的主要影响因素。通过对比有限元法和我国现行基础设计规范法的底板柱边弯矩及冲切力计算结果,建议对黏土地基和刚度较大的岩石地基上的规范计算值上乘以适当的放大系数,以保证工程安全。

Stress distribution law of spread foundation on three typical types of subgrade are analyzed by FEM.Result showed that the property of subgrade soil and relative stiffness of foundation to subgrade are two important factors that affect the stress distribution mode of subgrade,Some design recommendations arc made by comparing bending moment of control by Chinese code for design of building foundation.