Abstract:

Shangshuijing Station on Line 5 of Shenzhen Metro is located close to a high slope, therefore,the influence of the distance between the high slope and the foundation pit on the foundation pit stability can not be neglected. In order to understand such influence and to determine the rational distance between the foundation pit and the high slope, FLAC3D software is used to analyze the displacement of the piles, the bending moment of the piles, the settlement of the slope and the ground surface settlement under the condition of different distances from the foundation pit to the high slope. The results show that: 1) In the construction of the foundation pit at the foot of the high slope, the maximum displacement of the piles close to the slope and the distance between the foundation pit and the slope have an exponentiallydecreasing correlation; the maximum displacement of the piles far from the slope and the distance between the foundation pit and the slope have an exponentiallyincreasing correlation; when the distance between the slope and the foundation pit is more than 24m, the maximum displacement of the piles becomes stable; 2) When the distance between the slope and the foundation pit is more than 2m, the maximum ground surface settlement on the side far from the slope “y” and the distance between the foundation pit and the slope “d ” have an exponentiallyincreasing correlation; when the distance is more than 24m, the maximum ground surface settlement becomes stable; 3) The maximum settlement of the slope “y” and the distance between the foundation pit and the slope “d” have an exponentiallydecreasing correlation; when the distance between the slope and the foundation pit is more than 16m, the influence of the foundation pit excavation on the slope can be neglected; 4) The overall stability coefficient of the foundation pit “y” and the distance between the foundation pit and the slope have an exponentiallyincreasing correlation; when the distance between the slope and the foundation pit is 0m, the overall stability coefficient of the foundation pit is the least, being 1.80.

Key words: high slope, deep foundation pit, ground surface settlement, numerical analysis, stability