软土地区邻近轨道交通设施的基坑支护技术应用与分析

Application and Analysis of Foundation Pit Support Technology Adjacent to Rail Transit Facilities in Soft Soil Area

某深基坑工程邻近轨道交通高架段与地面段的过渡区域,该地面底部分布有深厚的软土,对工程施工极为敏感。为保证轨道交通的运营安全,基坑采用分区顺作的总体实施方案,并结合复合式地下连续墙、"十字对撑"、坑内被动区裙边加固以及"时空效应"的土方开挖方式等技术手段,严格控制基坑开挖对邻近轻轨的变形影响,取得了良好的施工效果。

A deep foundation pit project is adjacent to the transition zone between the elevated section of the railtransit and the ground section.The bottom of the ground is distributed with deep soft soil,which is extremely sensitiveto engineering construction.In order to ensure the safety of rail transit operation,the foundation pit adopts an overallimplementation scheme of normal partitioning procedures,and combines technical approaches of the compositeunderground continuous wall,the"cross-bracing",the skirt reinforcement on passive area in foundation pit,the earthexcavation based on time-space effect,etc.as earthwork excavation methods so as to strictly control the influence ofdeformation of adjacent light rails in the foundation pit excavation,which achieves good construction results.