高陡斜坡条件下桥梁桩基数值分析

Numerical Analysis of Bridge Pile Foundation under High and Steep Slope Conditions

高陡斜坡条件下桥梁桩基承载机理主要涉及桩的受力性状、荷载传递规律等方面,考虑桩-土(岩)相互作用影响,将桩周岩体及陡坡纳入分析体系,问题复杂,采用解析方法难以解决,故引入数值方法成为必然。文中以贵州省余庆至安龙高速公路沙河大桥桩基工程为背景,采用midas GTS NX软件对桩基进行数值模拟,分析计算桥桩的受力,同时研究桥梁在不同荷载作用下,所处边坡的力学响应,不同荷载组合效应对横坡段桥梁桩基结构内力和位移的影响,为高陡斜坡段桥梁桩基结构的承载特性研究提供参考。

The bearing mechanism research on the bridge pile foundation under the condition of high and steep slope mainly involved the study of bearing capacity behavior and load transfer law of the pile and other aspects.It was mainly affected by pile-soil(rock)interaction.During the research,because pile rock mass and steep slope were included in the analysis system,the problem would be very complicated.It was obviously difficult to solve the problem by analytical method,so the introduction of numerical methods became inevitable.Based on the pile foundation project of Shahe Bridge in Guizhou province,Midas GTS NX was used to carry out detailed simulation and stress calculation and analysis.The mechanical response of the side slope in different bridge loads and the effect of different load combinations oninternal forces and displacements of bridge pile foundation structure in the cross slope section were researched,which can provide a reference for theoretically revealing and summarizing the bearing characteristics of pile foundation structure of high steep slope section.