承压水地层深基坑开挖引起既有地铁车站上浮控制技术研究  

Study on Floating Control Technology of Existing Metro Station Caused by Deep Foundation Excavation in Confined Water Stratum

作　　者：王松 李柏青 黄明利[2] Wang Song;Li Baiqing;Huang Mingli(First Department of Engineering,Beijing Municipal Construction Group Co.,Ltd.,Beijing 100176,China;School of Civil Engineering&Architecture,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京市政集团建设有限责任公司第一工程处,北京100176 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《市政技术》2023年第4期124-131,共8页Journal of Municipal Technology

摘　　要：以北京地铁17号线新建次渠站工程为例,通过数值模拟分析了减压降水、地下连续墙嵌入深度和上部堆载对既有地铁车站上浮的控制效果。研究结果表明:对承压水(六)和承压水(七)同时进行降水可以减缓既有地铁车站的上浮,上浮值可控制在4.17 mm;在减压降水基础上提高地下连续墙嵌入深度至40 m,完全隔断承压水(六),既有地铁车站上浮值可减小至4.44 mm,在施工过程中及时进行上部堆载,可将既有地铁车站上浮值控制在2 mm以内。在基坑开挖过程中,配合减压降水,增大地下连续墙嵌入深度和进行上方堆载可有效控制结构上浮。Taking the newly-built Ciqu Station of Beijing Metro Line 17 as an example,the control effects of embedded depth of diaphragm wall and upper heap load on the floating of existing subway station are analyzed by numerical simulation.The results show that precipitation of confined water(6)and confined water(7)simultaneously can slow down the floating of existing subway station,and the floating value are at 4.17 mm;On the basis of reducing pressure and dewatering,the embedding depth of diaphragm wall is increased to 40 m and the confined water(6)is completely cut off so that the floating value can be reduced to 4.44 mm.The floating value can be controlled within 2 mm by loading the upper part in time during construction.In the process of foundation pit excavation,the floating of the structure can be effectively controlled by reducing pressure and dewatering,increasing the embedded depth of diaphragm wall and upper surcharge.

关 键 词：既有地铁车站 基坑开挖 上浮控制 承压水地层 数值模拟 

分 类 号：TU94[建筑科学—建筑技术科学]