Research on Stability Analysis of Soft Foundation Slope and its Anti-Slip Pile Support Technology

In this paper, a high fill soft foundation slope is taken as an example to analyze its stability by FLAC3D. The secondary slip surface of the slope is obtained, and the safety factor is 0.19. The main slip surface of the slope is obtained after the subgrade is converted into the applied load, and the safety factor is 0.61. The two are different because the safety factor is aimed at different objects, the former is the construction of high fill roadbed, the latter is the whole original slope. The length of the anti-slide pile is set as 16m, 17m, 18m, 19m and 20m. After calculation, it is found that the safety factor increases with the increase of the pile length, and the maximum shear force and maximum horizontal displacement of anti-slide pile both decrease with the increase of the pile length, and the change tends to be gentle when the pile length increases to 18m. Therefore, a pile length of 20m is chosen. A total of 16 anti-slide pile layout modes are set with longitudinal/transverse spacing of 5m, 10m, 15m and 20m, respectively.