Static Pressure Pile Expansion Theory Research And Numerical Simulation Analysis

In soft foundation treatment, the use of static pressure pile is more and more widely. How to in construction process to reduce the impact on the surrounding environment is deserving of research. Cylindrical cavity expansion theory and numerical simulation is the two most commonly used method to study of soil compaction problems. In this paper, on the basis of summarizing the predecessors’research results, considering the influence of the structural characteristics of the soft clay, based on the cylindrical cavity expansion theory, spatial sliding surface theory is used to analyze the pile when the characteristics of strain softening and dilatancy of soil structural, elastic zone and the plastic zone are given stress, strain and radial displacement and the relevant solutions for the super static pore water pressure.This article uses the finite difference software FLAC3D for structured soils of numerical simulation for the process of pile sinking, effective analysis and forecasting the displacement field of soil and the rule of the excess pore water pressure distribution and lift. In this paper, the main results are as follows:(1) Based on the SMP criterion is given column hole expansion problem of plastic zone and elastic zone, stress, strain and displacement of the solutions.(2) Considering strain softening of the column in the pore solution, the internal friction Angle under the condition of different subsequent yield, get the changing rule of the plastic zone radius ratio; Select different dilatancy parameters, get the dilatancy of soil, expanding pressure and plastic radius and the influence of radial displacement.(3) The soil compaction of the radial displacement of the approximate a logarithmic form with the increase of radial distance attenuation, and the faster the closer from the center of pile attenuation. Static pressure early soil vertical displacement of uplift pile sinking, the late soil is sinking, and vertical displacement after the first increases with the increase of depth decreases, and performance in the entire surface of the soil pressure during piling for uplift.(4) In the homogeneous soil pile will produce very big in the pile soil initial excess pore water pressure, on the radial logarithmic decrement.