南京地铁鸡鸣寺站地下连续墙深层水平位移特性研究

根据南京地铁鸡鸣寺站深基坑工程监测数据，分析了地下连续墙变形性状，对基坑施工过程进行了数值模拟，进一步分析了第四道混凝土支撑及深层支撑竖向间距对地下连续墙水平位移的影响。研究表明，该工程地下连续墙水平位移成抛物线型位移，最大水平位移位置下降到21.5 m后不再因开挖加深而下降；仅改变最后一道支撑位置对地下连续墙最终变形影响不大；合理采用混凝土支撑以及增加一道支撑可以有效控制地下连续墙的水平位移。

Characteristics of Diaphragm Wall Deformation at Jimingsi Subway Station in Nanjing

According to the deep foundation pit monitoring data of Jimingsi subway station in Nanjing, the deforma-tion behavior of diaphragm wall is analyzed. Finite element analysis is conducted on the construction process of deep foundation pit. Furthermore, factors affecting diaphragm wall are investigated, and two of them, including the fourth reinforce concrete support and the vertical spacing of deep support, are selected for further analysis. Studies show that the form of horizontal displacement of diaphragm wall is parabolic. The maximum horizontal displace-ment down to 21.5 meters no longer continues with excavation depth increasing. Reasonable support and increas-ing the use of concrete support can effectively control the horizontal displacement of diaphragm wall.