科技创新与应用2025，Vol.15Issue(35)：12-19,8.DOI:10.19981/j.CN23-1581/G3.2025.35.003
南京某地铁车站深基坑覆水开挖支护方案优化设计
摘要
Abstract
Relying on the foundation pit project of a subway station in Nanjing,this study compared conventional dewatering excavation with water-covered excavation with steel supports,and proposed a water-covered excavation method in which water completely replaces steel supports in the foundation pit to provide lateral support.Three different working conditions models were built through numerical simulation to analyze surface settlement,lateral displacement of soil outside the pit,displacement of diaphragm wall,bending moment and axial force of steel supports.The results show:In foundation pits with high groundwater levels and difficult precipitation,the use of water-covered excavation significantly reduces the deformation and influence range of the soil outside the foundation pit;the horizontal displacement of the diaphragm wall is similar to that of conventional precipitation excavation;the bending moments of the diaphragm wall during the excavation stage are all within the range of conventional precipitation excavation,and the maximum bending moment after pumping exceeds that of conventional precipitation excavation;in water-covered excavation with support,the axial force of the steel support before pumping is less than that of conventional precipitation excavation,and significantly increases after pumping,and the change trend is consistent with the deformation of the diaphragm wall;The deformation of the soil outside water-covered excavation without steel supports is obviously less than that of conventional dewatering excavation,and the maximum horizontal displacement is slightly larger than the latter,while the maximum bending moment during the pumping stage obviously exceeds the conventional value.The use of water-covered excavation can reduce the demand for the enclosure structure,and measures need to be taken in subsequent construction to ensure that the force on the enclosure structure is within a safe range.关键词
岩土工程/覆水开挖/变形控制/地铁基坑/地表沉降/支护设计Key words
geotechnical engineering/submerged excavation/deformation control/subway foundation pit/surface settlement/support design分类
交通工程引用本文复制引用
..南京某地铁车站深基坑覆水开挖支护方案优化设计[J].科技创新与应用,2025,15(35):12-19,8.基金项目
国家自然科学基金(52478346) （52478346）
