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以上海某地铁风井基坑为研究对象,介绍该风井基坑开挖施工涉及的关键工序。通过对地表沉降、地下连续墙墙顶沉降以及测斜位移的监测,探讨了基坑开挖施工过程对周围地表沉降的影响和围护结构的影响,得出地表沉降随基坑开挖深度增加而增大,基坑的长宽尺寸也是影响地表沉降的因素之一,测斜位移与基坑深度呈抛物线型。
Taking a subway shaft wind tunnel in Shanghai as the research object, this paper introduces the key processes involved in the excavation of the foundation pit of the shaft. Through the monitoring of surface subsidence, roof subsidence of continuous diaphragm wall and the measurement of inclinometer displacements, the influence of excavation process on the surrounding ground settlement and the influence of enclosure structure are discussed. It is concluded that the surface subsidence increases with the excavation depth However, the length and width of the foundation pit are also one of the factors affecting the settlement of the ground surface. The displacement of the inclinometer and the depth of the foundation pit are parabolic.