摘要
对北京地铁某车站明挖基坑施工跟踪监测,及时掌握基坑变形、支撑内力的变化动态,分析了施工过程中支护结构位移与内力的变化特征,并指导施工确保基坑稳定。测试表明：a)围护结构水平位移随工期的延续而增加,基坑开挖完成后逐渐趋于稳定,位移在第2道支撑处最大,围护结构底部位移较小；b)第1道钢支撑的轴力明显大于第2道和第3道支撑的轴力,c)在基坑阳角处斜钢支撑的轴力比其他位置钢支撑的轴力要大得多。
A field monitoring programme is carried out for the open-excavated proiect of a subway station in Beijing, the trends of the displacements and the inner forces are under control, and the change of characteristics of displacements and inner forces in the retaining structure during the construction is analyzed. The necessary engineering measurements are taken to keep the stability of the excavated foundation pit. There are several monitoring conclusions as follows： a） the horizontal displacements of retaining structure increase with the construction duration and tend to be ltable gradually after the foundation-pit excavation is completed, The largest displacement appears on the second layer steel support tube and the displacement is the smallest in the bottom of retaining structure; b） the axial forces on the first layer steel-support tube significantly greater than those of the second and the third layers; and c） the axial forces on the diagonal steel-support tubes in the outside corner of the foundation-pit are much greater than those of the others.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2006年第10期874-878,共5页
Journal of Beijing University of Technology
基金
北京市教育委员会科学技术与研究生教育建设项目资助(4700001401506).
关键词
地铁车站
地下结构
施工
监测
subway stations
underground structures
construction
monitoring
