高边坡下基坑设计参数对基坑变形的影响研究

Shangshuijing station of Shenzhen metro line 5 rely on the mountain of city，the influence of the slope on foundation stability can not be ignored.To study the pit slope design parameters under the influence of pit deformation, using FLAC3D software, respectively, from the slope of the different foundation from the foundation pit excavation of different width and depth of different excavation pit deformation of the pile, the pile bending moment, the surrounding ground surface subsidence were studied. 1) high slope, the pile displacement y and the maximum distance x from the foundation between the exponential decay, with increasing distance from the pit, the displacement rate of decrease becomes smaller, and finally tends to 0. According to the deformation of pile 30mm and fitting formula for the inverse we can see that foundation should be at least 2.5m from the slope above the excavation to ensure safety. 2) slope deposition, the width of the left pile displacement with the excavation can be divided into three regions: in the first region, both large and small, with the excavation width increases; in the second region , both with the excavation width decreases; in the third region, both excavation width along with the increase. 3)The deformation pile excavation depth on the left was "forward-shaped", the largest displacement in the top of the pile, and in the following is almost 0-20m; with the excavation depth increases, the pile deformation curve shape do not change; the right post as the excavation depth increases, the deformation curve shape by the "bow-shaped curve" to the "backward form of" change, the deeper the excavation, pile head displacement outside the pit is greater.