山区涵洞受力影响因素的数值模拟分析  

Numerical simulation of influencing factors of mountainous culvert pressures

作　　者：马强[1] 郑俊杰[1] 张军[1] 

机构地区：[1]华中科技大学岩土与地下工程研究所,湖北武汉430074

出　　处：《合肥工业大学学报（自然科学版）》2009年第10期1514-1517,1521,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(50478090);湖北省交通厅科技攻关资助项目((2005)361号)

摘　　要：文章通过数值模拟详细讨论了涵洞路段几何条件与地基刚度对涵-土体系受力状态和位移特性的影响,对比分析了不同型式与尺寸的涵洞受力与位移规律。结果表明,沟谷宽小于3倍涵洞宽度时,涵顶压力与涵体位移受沟谷宽度与岸坡角度影响较为显著;较大的地基刚度引起更大涵顶压力;涵洞采用壳体基础与整体式基础时涵顶压力与涵体位移没有显著差异,比采用分离式基础的沉降小,涵顶压力集中程度大;断面高而窄的涵洞比矮而宽涵洞的涵顶压力和竖向位移大。This paper discusses in detail the influences of geometry conditions and subgrade stiffness on the stresses and displacements of the culvert-soil system by numerical simulation, compares and analyzes the laws of stresses and displacements of culverts of different types and sizes. The results show that the stresses and displacements of culverts are influenced by the width of gullies and the angle of side slopes significantly when the width of guJlies is less than 3 times the width of culverts, and larger subgrade stiffness brings about a greater culvert roof pressure. There is only a small difference in the stress and displacement between the culverts with the arch shell and integral foundation, and both of them have smaller displacements but higher roof pressure than the culvert with separated foundation. The culvert with a high and narrow cross-section bears a higher earth pressure on the roof and has a larger vertical displacement than the one with a dwarf and wide cross-section.

关 键 词：山区公路 涵洞 数值模拟 压力 位移 选型 

分 类 号：U449[建筑科学—桥梁与隧道工程] TU432[交通运输工程—道路与铁道工程]