管幕内顶进箱涵的前端网格长度合理设计  

Design method for length of grids inserted in the front of a box culvert surrounded by pipe-roof

作　　者：肖世国[1] 夏才初[1] 李向阳[1] 朱合华[1] 刘学增[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《岩土工程学报》2005年第11期1306-1309,共4页Chinese Journal of Geotechnical Engineering

基　　金：中国博士后科学基金资助项目(2004035493);上海市科学技术委员会科研计划重大项目(04dz12004)

摘　　要：上海市中环线虹许路北虹路下立交工程是目前世界上在饱和含水软土地层中施工的截面最大的管幕法工程。为保证在管幕内顶进大断面箱涵(前端嵌固钢板制网格框架)的施工过程中开挖面的稳定性,在网格横截面尺寸一定的情况下,设计合理的网格长度就十分重要。在考虑箱涵上部管幕允许沉降变形的基础上,根据作用于网格内壁土压力的分布模式,并兼顾考虑实际操作的可行性,给出了网格长度的较为合理的设计计算方法,详细计算出了较为合理的网格长度,较好地满足了各主要控制因素。The subway crossing project through Hongxu Road is a pipe-roof project with the largest cross-section box culvert in the world now. It is constructed in saturated soft soil stratum in the Beihong Road located in Shanghai. In order to keep the cutting surface stable while the pipe-roof is pushed into the box culvert with many steel grids, it is very important to design rational length of grids with the given cross-section. On the basis of allowable vertical deflection of pipes over the culvert and mechanical model of earth pressure acting on inner plates of a grid, rational approach to design length of grids was given in some practical projects. Finally feasible length of grids was rationally given in detail for the practical project.

关 键 词：管幕 箱涵 网格 土压力 

分 类 号：TU47[建筑科学—结构工程]