基坑施工降水对邻近地铁隧道的影响  

Influence on Subway Tunnel Adjacent to Excavation by Dewatering

作　　者：张明[1] 潘炳玉[1] 

机构地区：[1]河南工程学院土木工程学院,郑州451191

出　　处：《科学技术与工程》2013年第21期6164-6170,共7页Science Technology and Engineering

基　　金：河南省科技发展计划项目;(122102310449)资助

摘　　要：基坑施工降水对邻近地铁隧道产生附加沉降,正确评估其大小及对地铁运营安全的影响具有重要意义。介绍了某工程基坑支护结构及周边复杂环境条件,考虑基坑围护桩人工挖孔桩施工降水实际情况,在某些假定条件下,采用简化大井降水分析方法。分五种工况对围护桩施工降水对邻近地铁隧道产生的附加沉降进行了计算分析。结果表明:考虑降水对地铁最大影响时,地铁隧道产生的最大沉降为5.7 mm,不满足地铁运营线路轨道变形的要求;采用跨三桩施工降水可将地铁隧道产生的附加沉降控制在地铁运营线路轨道变形范围内。针对减少基坑施工降水对地铁隧道的影响,提出了一些建议与措施。Additional settlement of subway tunnels adjacent to excavation was produced by dewatering,and it is great significance for the correct assessment of its size and influence on the safety of subway operation.The bracing structure and peripheral complex environmental conditions for the excavation is introduced.Considering of some actual situations of dewatering by manual hole digging and retaining piles,based on some assumptions,the calculation and analysis on additional settlement of subway tunnels adjacent to excavation affected by dewatering in five construction conditions are conducted by a simplified large well analysis method.The results were shown that the largest settlement of subway tunnels affected by dewatering is 5.7 mm when the largest influence of dewatering on subway is considered,which does not meet the requirements of subway operation line track deformation;additional settlement of subway tunnel by dewatering will be controlled within the subway operation circuit track deformation range by cross-three piles construction and dewatering.Some suggestions and measures on reducing the influence for dewatering in excavation on subway tunnel are proposed.

关 键 词：地铁隧道 基坑 降水 附加沉降 水位降深 

分 类 号：U231.3[交通运输工程—道路与铁道工程]