东部沿海软土车站深基坑开挖地连墙变形规律  

Deformation Law of Diaphragm Wall in Deep Foundation Pit Excavation of Soft Soil Stations along the Eastern Coast

作　　者：周东波 梅源[1,2] 刘子扬 柯鑫 ZHOU Dongbo;MEI Yuan;LIU Ziyang;KE Xin(School of Civil Engineering,Xian University of Architecture&Technology,Xian 710055,Shaanxi,China;Shaanxi Key Lab of Geotechnical and Underground Space Engineering,Xian 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]陕西省岩土与地下空间工程重点实验室,陕西西安710055

出　　处：《重庆交通大学学报（自然科学版）》2024年第12期41-46,54,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(52178302);陕西省重点研发项目(2020SF-373)。

摘　　要：为了明确东部沿海软土地区地铁车站深基坑开挖引起的地连墙变形规律,对杭州、上海、宁波为代表的东部沿海地区地铁车站深基坑地连墙变形特性开展统计分析,结果表明:3个地区地连墙侧向变形集中于0~30mm,大于其它地区围护结构侧向变形统计值。地连墙最大侧向变形随基坑开挖深度增大而增加,杭州地区地连墙最大侧向变形随基坑开挖深度变化范围较大,但基坑开挖深度对地连墙变形的影响小于上海和宁波地区。对地连墙侧向变形曲线进行无量纲化处理得到3个地区地铁车站基坑地连墙变形表现为“中凸形”模式,地连墙侧移在0~0.5x(x表示开挖深度内地连墙最大侧向变形对应位置与基坑开挖深度的比值)范围内增速较快,最大侧移发生在0.5x~1.1x间的位置,随后逐渐减小。In order to clarify the deformation law of diaphragm walls caused by deep foundation pit excavation of subway stations in soft soil areas along the eastern coast,the statistical analysis was carried out on the deformation characteristics of diaphragm walls in deep excavation of subway stations in eastern coastal areas represented by Hangzhou,Shanghai and Ningbo.The results show that the lateral deformation of the diaphragm walls in the above three areas is concentrated between 0 and 30 mm,which is greater than the statistical value of lateral deformation of the enclosure structures in other regions.The maximum lateral deformation of the diaphragm wall increases with the increase of the excavation depth of the foundation pit.The maximum lateral deformation of the diaphragm wall in Hangzhou region varies greatly with the excavation depth of the foundation pit,but the impact of the excavation depth of the foundation pit on the deformation of the diaphragm wall is smaller than that in Shanghai and Ningbo regions.The non-dimensionalization treatment of the lateral deformation curve of the diaphragm wall shows that the deformation of the diaphragm wall in the foundation pit of the three subway stations exhibits a"convex"pattern.The lateral displacement of the diaphragm wall increases rapidly within the range from 0 to 0.5 x(x represents the ratio of the corresponding position of the maximum lateral deformation of the diaphragm wall within the excavation depth to the excavation depth of the foundation pit),and the maximum lateral displacement occurs between 0.5 x to 1.1 x,which gradually decreases thereafter.

关 键 词：岩土工程 东部沿海地区 软土 基坑工程 地铁车站 地下地连墙 变形特性 

分 类 号：TU473.2[建筑科学—结构工程]