地铁车站明暗挖施工引起的地表沉降叠加效应研究  

Study on Superposition Effect of Surface Settlement Caused by Subway Station Open and Subsurface Excavation Construction

作　　者：宫志群 王永志 廖少明[1] 唐聪 GONG Zhiqun;WANG Yongzhi;LIAO Shaoming;TANG Cong(College of Civil Engineering,Tongji University,Shanghai200092,China;China Construction Infrastructure Co.,Ltd.,Beijing100044,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中国建设基础设施有限公司,北京100044

出　　处：《施工技术（中英文）》2024年第3期6-13,共8页Construction Technology

基　　金：中建股份科技研发计划项目(CSCEC-2018-Z-30);中建基础科技研发项目(CSCIC-2021-KT-(04))。

摘　　要：为满足复杂环境下大型地下空间的高效开发需求,地下工程采用明暗挖工法进行组合施工的趋势日益明显。而近距离的明挖与暗挖施工会产生地层沉降叠加效应,研究其规律对于施工控制及环境安全较重要。以徐州地铁彭城广场站工程为背景,采用文献调研及数值模拟法对明暗挖组合式地铁车站开挖施工引起的地表变形规律进行研究,并与单一形式的明挖和暗挖引起的地表沉降特征进行对比。研究结果表明,明暗挖施工引起的地表沉降叠加效应与两者的先后开挖顺序及基坑与隧道间距相关。地表沉降叠加形态随基坑与隧道间距变化,随着基坑与隧道间距的增加地表沉降形态从单凹槽形变为双凹槽形;先明挖后暗挖顺序下暗挖隧道施工引起的最大地表沉降增加,先暗挖后明挖顺序下明挖基坑施工引起的最大地表沉降减小。To meet the efficient development demand of large underground spaces in complex ground environments,the trend of combining open and subsurface excavation for underground engineering construction is becoming increasingly evident.However,the close interaction between open and subsurface excavation inevitably leads to the superposition effect of ground deformation,and studying its regularity is essential for construction control and environmental safety.This paper takes the Xuzhou Subway Pengcheng Square Station engineering project as the background,and uses literature research and numerical simulation methods to study the regularity of ground deformation caused by the excavation of a combined open and subsurface excavation for the subway station,and compares it with the ground settlement characteristics caused by a single form of open or subsurface excavation.The research results show that the superimposed effect of ground settlement caused by open and subsurface excavation is closely related to the excavation sequence and spacing between the distance of foundation excavation and tunnel.The ground settlement superposition form changes with the distance between the distance of foundation excavation and tunnel,evolving from a single concave groove to a double concave groove with increasing distance.The maximum ground settlement caused by subsurface excavation in the open first and subsurface second sequence is generally amplified,while the maximum ground settlement caused by open excavation in the tunneling first and open second sequence is generally reduced.

关 键 词：地铁 沉降 叠加效应 数值分析 

分 类 号：TU94[建筑科学—建筑技术科学]