无内衬地下连续墙的变形影响及控制

以上海市延长路地铁车站为依托工程,选取典型的无内衬地下连续墙水平位移监测点、轴力监测点和地表沉降监测点,根据其在车站内部结构施工不同阶段的最大位移时程曲线、轴力变化情况及地表沉降曲线等,分析了无内衬墙结构的变形特征,即基坑开挖阶段变形最大,中板施工完毕后,变形逐渐稳定.根据周围管线和建筑物的沉降、倾斜时程曲线,分析了无内衬墙变形对周围环境的影响,即基坑开挖阶段,管线沉降速率最大,建筑物倾斜明显,结构施工阶段,管线沉降速率、建筑物倾斜逐渐减缓至稳定,这与无内衬墙结构的变形规律相吻合.

Influence of Deformation of Underground Curtain without Interior Wall and Its Control Measures

On the basis of metro station on Yanchang Road of Shanghai,this paper selected typical horizontal displacement monitoring,stress and settlement points of underground curtain without interior wall.According to the biggest displacement time-travel curve,stress variation and ground settlement curve in different construction phases,deformation features of underground curtain without interior wall were analyzed.During excavation digging,deformation are the biggest,and during the structure construction,deformation is stable.According to settlement time-travel curve of pipeline and inclination time-travel curve of building,the influences of underground curtain on environment were analyzed.During excavation digging,pipeline settlement and building inclination are the biggist,and during the construction,pipeline settlement and building inclination is stable.The above curves meet the deformation of the underground curtain without interior wall.