采用下负荷面剑桥模型对上海某工程基坑开挖和降水的地层沉降效应进行有限元计算，分析了其对邻近地铁隧道的影响。分别计算了基坑开挖与降水共同作用和仅降低承压含水层水位而无开挖两种工况条件下，基坑周边环境的沉降影响，以此获得承压含水层水位降低引起周边地铁隧道沉降与基坑开挖降水综合作用下引起的总沉降的关系，并据此将基坑降水引起的沉降从总沉降量中予以分离。研究成果可为工程性地面沉降研究与防治提供借鉴。%This paper uses the subloading Cam-clay model, based on the finite element method, to calculate the formation subsidence effect caused by excavation of a foundation pit and subsequent dewatering, and analyses its impact on a nearby tunnel. Potential subsidence surrounding the foundation pit was calculated under two scenarios: first, the combined effect of foundation pit excavation and dewatering, and second, reducing only the confined aquifer water level without excavation. From these calculations, we obtained the total subsidence, which is the subsidence surrounding the tunnel caused by the confined aquifer drawdown and other subsidence caused by the foundation pit excavation and dewatering. From these results, we were able to separate the level of subsidence caused by the foundation pit excavation and dewatering from the total subsidence. This provides a reference point for further research into, and the control of, engineering-related land subsidence.
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