管幕内箱涵顶进中顶部管幕竖向变形预测  

VERTICAL DEFORMATION PREDICTION ON UPPER PIPE-ROOF DURING A BOX CULVERT BEING PUSHED WITHIN A PIPE-ROOF

作　　者：肖世国[1] 夏才初[2] 朱合华[2] 李向阳[2] 刘学增[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]同济大学土木工程学院,上海200092

出　　处：《岩石力学与工程学报》2006年第9期1887-1892,共6页Chinese Journal of Rock Mechanics and 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横截面最大的管幕法工程。针对实际箱涵顶进施工过程中顶部管幕出现的以隆起为主的竖向变形,根据对箱涵前方滑动土体及箱涵体的力学分析,确定作用于顶部管幕下的附加荷载,进而将顶部中间部分的钢管视为在该附加荷载作用下的倒置于Winkler地基上的弹性地基梁,以此模型预测分析顶部中间部分钢管幕的竖向变形,并同实测结果进行比较,发现二者在规律及大小上都较为接近,说明该预测分析方法具有一定的合理性。Up to now, the subway crossing project through Hongxu Road is a pipe-roof project with the biggest cross-section of box culvert in the world. It is constructed in saturated soft soil stratum in the Beihong Road located in the middle ring-road in Shanghai. During the box culvert being pushed within the steel pipe-roof in the practical construction, the upper pipe-roof presents mainly upheaving deformation. According to analyzing mechanical equilibrium conditions on the culvert and sliding soil mass in front of it, the additional load on the upper pipe-roof is got. One of the upper and middle steel pipes can be thought of as a beam laid conversely on Winkler foundation and pressed by the additional load. The vertical deformation of the upper and middle steel pipe-roof can be predicted by the mechanical model. The theoretical results are compared with the monitoring results during the culvert being pushed. It is found that they are approximately same on variation characteristics and values, which shows the prediction method is reasonable in some degree.

关 键 词：隧道工程 管幕 箱涵 竖向变形 WINKLER地基 

分 类 号：U45[建筑科学—桥梁与隧道工程]