杭州粉砂土地基深基坑施工对邻近地铁隧道、车站的影响研究

Effect of construction of deep excavation in Hangzhou silty sand on adjacentmetro tunnels and stations

摘要: 以杭州七堡控制中心综合体中段北区基坑作为工程背景，采用分层总和法、PLAXIS有限元软件进行粉砂土地基降水和基坑开挖对邻近隧道基础沉降的叠加影响分析，采用整体式双排围护结构控制基坑开挖时的土体变形，提出了围护结构复合刚度的简化计算公式。实践表明复合刚度取值介于等面积和等弯刚度之间，符合工程实际，而分层总和法计算的沉降量远大于实测值，需作折减。

Abstract: The researches on the settlement of soil, deformation of retaining wall and environmental impact of deep excavation of Metro Control Center during construction, which is 6~8 m away from the metro tunnel and station, are presented. A series of methods are taken, such as dewatering, water proofing and double-row retaining wall to ensure the safety of the metro tunnel and station. The construction is succeeded with the deformation of metro tunnel in the range of allowable values.