Author(s)

Bo Wu, Zhongjian Nong, Wei Huang, Guowang Meng and Jinsong Huang

Corresponding Author

Wei Huang

ABSTRACT

Based on the foundation pit of a station of Nanning Metro Line 5 as the research background, the measured data of pile horizontal displacement, supporting axial force and surrounding soil settlement during the construction of the foundation pit are systematically analyzed. Monitoring analysis shows that with the increase of the excavation depth of foundation pit, the horizontal displacement of retaining pile increases and gradually moves down, among which the horizontal displacement at 11-12m is the largest; the internal support force is roughly proportional to the time in the excavation process; the settlement of soil beside the pit increases gradually, and the settlement deformation at 6-8m near the pit is the largest, and finally the settlement decreases with the increase of the distance from the pit. Based on the deformation of foundation pit caused by excavation of foundation pit, numerical simulation is carried out to establish a three-dimensional model of foundation pit. Combined with the field monitoring data, data comparison and analysis are carried out. The deformation laws of the two are basically the same, which proves the safety and stability of the bored pile combined with the internal support structure, and provides a basis for the construction design of similar foundation pit projects.

KEYWORDS

Subway station, deep foundation excavation, deformation, monitoring analysis, numerical simulation