逆作法施工引起的地铁车站结构关键节点的应力演化  

Stress evolutions of some key points in the structure of subway station using cover and top-down excavation method

作　　者：冉道平 肖峰[2] 陈佩佩[2] 白冰[2] 

机构地区：[1]中建交通建设集团有限公司,北京100142 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2015年第1期28-32,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家"973"计划项目资助(2015CB0578000)

摘　　要：通过有限元数值模拟方法,对盖挖逆作法施工中地铁车站结构的几个关键节点的受力状态和演化过程进行分析.研究表明:施工过程中墙与板连接点处板的上侧受拉而下侧受压,中板与侧墙连接点处由于基坑外侧土的侧向应力释放,使得在负二层土开挖后,中板上侧也由受拉转为受压状态;柱与板连接点处板的上侧受拉而下侧受压,顶板与中柱连接点由于负一层土回弹,在施工初期上侧受压而下侧受拉,在上覆土回填之后应力状态再次转变为上侧受压.计算表明:下置导墙处混凝土的拉应力、剪应力及最大主拉应力和最大主压应力均小于混凝土设计强度值.Based on a subway station in Beijing city,the characteristics of some key points of the main structure of subway station in the process of construction using excavation top-down method are studied systematically by numerical simulation. The mechanical convert characteristics of plates-wall connection point,pile-plate connection point,and down ward guide wall of top plate are analyzed in the whole processes of construction. Calculation results show that the mechanical status of plates-wall connection point and pile-plate connection point is very complicated. The stress state of down ward guide wall of top plate contiguously changes very obviously. However,the positive stress,negative stress,shear stress and maximum and minimum main stress are all limited in the infinite ranges in the whole construction process,which is satisfied with the design demand.

关 键 词：地铁车站 地基基础 盖挖法 墙板连接点 柱板连接点 下置导墙 

分 类 号：U231.4[交通运输工程—道路与铁道工程] TU473[建筑科学—结构工程]