高灵敏度地层深基坑地连墙变形及控制技术

Deformation and Control Technology of Diaphragm Wall in Deep Foundation Pit with High Sensitivity

以太原地铁2号线一期矿机站深基坑开挖为工程背景,对该高灵敏度地层基坑开挖引起的地连墙大变形及其原因进行分析,并提出相应的变形控制措施。结果表明,高灵敏度地层、地下水位和基坑周边动载是地连墙大变形的主要影响因素;优化基坑开挖施工工艺、基坑周边车辆限行、合理的堵水方案等措施可有效控制地连墙的变形。所提太原地铁2号线一期矿机站深基坑地连墙变形控制技术可为太原地铁1号线的顺利建设提供技术支撑。

Taking the deep foundation pit excavation of the first phase mine station of Taiyuan Metro Line 2 as the engineering background,the large deformation of the diaphragm wall caused by the excavation of the high-sensitivity stratum foundation pit and its causes are analyzed,and corresponding deformation control measures are proposed.The results show that high-sensitivity stratum,groundwater level and dynamic load around the foundation pit are the main factors affecting the large deformation of the diaphragm wall;measures such as optimizing the excavation technology of the foundation pit,restricting vehicles around the foundation pit,and reasonable water blocking plan can effectively control the deformation of the diaphragm wall.The proposed technology to control the deformation of the diaphragm wall of the deep foundation pit of the mine station of the first phase of Taiyuan Metro Line 2 can provide technical support for the smooth construction of Taiyuan Metro Line 1.