关键词: 离心模型试验, 斜坡软弱土地基加固, 水泥土搅拌法, 变形特性

Abstract:

In order to know well the deformation characteristics of slope soft-soil foundation under the action of embankment loading and find a reasonable foundation treatment measure, taking a special project about reconstruction of newly-built Da-Cheng railway project as a prototype, this paper designs 5 groups centrifugal model tests based on the mixed-in-place pile to deal with the foundation's strategies. According to the analysis of the experimental data, the conclusions are drawn as follows. 1) By adopting different pile spaces layout style at the upside and downside directions of the slope, it can reduce the different deformations of the slope soft-soil foundation along the lateral side and improve the uniformity of the foundation treatment. 2) It has better deformation binding effect by setting up the tilted pile in the downhill side of the slope soft-soil foundation; but it has less effective performance in controlling the vertical subsidence. 3) The slope soft soil foundation deformation that appeared at the downhill side will give rise to the same direction deformation at the uphill side, and the horizontal deformation is more obvious. The foundation treatment should put emphasis on the deformation controlling of downhill side. 4)The varying law about horizontal deformation along the depth direction shows para-curve style which is first adding then reducing and hyperbola style that is humdrum reducing, attribute to the density of the pile layout.

Key words: centrifugal model test, slope soft soil foundation treatment, mixed-in-place pile, deformation characteristics