湿陷性黄土地区地铁深基坑支护设计  

Bracing design for deep foundation pit of subway in loess area

作　　者：陈秋南[1] 周国华[1] 张帆 张主华[1] 

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]中铁十九局集团西安地铁工程公司,陕西西安710061

出　　处：《湖南科技大学学报（自然科学版）》2009年第1期49-52,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家863计划项目(2006AA11Z104);湖南省自然科学基金项目(08JJ3111);湖南省高校科学研究项目(08B025);中国博士后基金项目(20060390872);国家安全生产监督管理总局项目(06-397);湖南省高等学校青年骨干教师培养计划资助

摘　　要：以西安地铁小寨站深基坑支护工程为例,对其所在区域的湿陷性黄土地质条件、周边环境进行了具体的分析,采用旋喷桩、钻孔灌注桩和钢支撑等支护方案进行基坑支护,充分发挥各自的优点.支护方案实施后,在现场监测基坑地表水平位移和地表沉降,基坑稳定后得到基坑地表水平位移最大值仅为6.4mm,地表沉降也没有超过设计值.实测结果表明基坑支护方案设计合理,基坑边坡变形得到了有效控制,各支护单元的受力性能发挥正常,确保了施工安全,取得了良好的经济效益和社会效益.图6,表3,参7.Xiaozhai Station of Xian Subway situates in Loess Area, the geologic condition and surrounding environment of a deep foundation pit are very complex. Based on the characteristic of deep foundation pit for subway, high pressure chemical churning pile, cast-in-place concrete pile, and steel-bracing were designed for bracing structure. During construction of deep foundation pit, the horizontal displacement and settlement of ground surface were monitored, the maximum value of horizontal displacement was only 6.4mm, the settlement of ground surface was smaller than designed value, and the mechanical properties of each support element are all in normal working consequence. The results show that the design of deep foundation pit is reasonable and the displacement of ground surface is controlled effectively, meanwhile, the construction safety and economic value are attained.

关 键 词：湿陷性黄土 深基坑 灌注桩 旋喷桩 支护设计 钢支撑 

分 类 号：TU444[建筑科学—岩土工程]