基于FLAC^(3D)的桥台和坝体基础底面及地基应力分析研究

Research on stress analysis of abutment and foundation base and foundation based on FLAC^(3D)

为了对桥台和坝体基础底面及地基应力进行研究,采用FLAC^(3D)数值模拟软件,分析了FLAC^(3D)数值模拟的计算过程,建立了桥坝三维实体几何模型,根据实际情况,对模型所使用材料物理力学性质以及模型的边界条件、上部结构对桥台的外荷载进行赋值研究,模拟分析了桥台和坝体基础底面应力。研究得出:随着桥台与坝体的各个阶段应力的施加,桥台基础底面拉应力主要集中在矩形四周,然而坝体的基础底面拉应力却主要集中在基底两侧,模拟分析混凝土的抗拉强度大于坝体与桥台基础底面最大拉应力,验证了基础强度满足要求。研究为类似工程条件下桥坝基础强度的验证提供一定的借鉴意义。

In order to study the stress of foundation and foundation of abutment and dam foundation,FLAC ^3D numerical simulation software was used to study the calculation process.The 3D solid geometric model of bridge dam was established.According to the actual situation,the material physics mechanical properties and the boundary conditions of the model,the superstructure assignment of the external load on the abutment to simulate the analysis of the abutment and dam foundation bottom stress,the study showed that：with the abutment and dam body in all stages of the application of stress,the tensile stress of the abutment foundation was mainly concentrated around the rectangle,but the tensile stress of the foundation bottom was mainly concentrated on both sides of the foundation.The tensile strength of the concrete was greater than the maximum tensile stress of the dam and the abutment foundation,which verified the foundation strength to meet the requirements,research for similar project conditions,the strength of bridge dam foundation verification provide some reference.