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既有桥梁扩大基础地基承载能力的评估是一个重要而又现实的问题。本文分析了扩大基础地基土受荷过程中附加应力的变化特点及其对地基土压缩模量的影响。根据地基土压缩模量变化对地基土沉降和承载力的影响分析,结合相关规范对地基容许承载力抗力系数的取值要求,重点探讨了原桥址重建或改造上部结构情况下,既有公路桥梁扩大基础地基承载能力的评估方法。该方法可用于指导既有桥梁扩大基础地基承载能力的分析和评估。
The evaluation of bearing capacity of existing bridges to expand basic foundations is an important and realistic issue. This paper analyzes the changing characteristics of additional stress and the effect on the compressive modulus of foundation soil when the foundation soil is enlarged. According to the analysis of the influence of the change of compressive modulus of foundation soil on the settlement and bearing capacity of foundation soil, and combining with the requirements of the relevant specifications for the value of bearing capacity resistance coefficient of foundation, the paper discusses mainly the reconstruction of original bridge site or the reconstruction of superstructure, Evaluation Method of Bridge Foundation for Expanding Bearing Capacity of Foundation. The method can be used to guide the existing bridges to expand the analysis and evaluation of the bearing capacity of foundation.