Research on Squeezing Effects of Jacked Pile in Layered Soil Based on the Model Test and Finite Element Simulation
|School||Tianjin Institute of Urban Construction|
|Keywords||Static pressure pile group In layered soil Soil compaction effects Model test Sliding friction Timeliness|
Topic for the Binhai New Area of ??static pressure pile compacting effects , especially the hard and soft soil at the junction of obvious practical problems exacerbated proposed to study the mechanism of action and laws , to solve the existing theory lags behind the actual problem . Firstly, a more detailed exposition of jacked pile compacting effect aspects Research Methods and Research , pointed out their strengths and weaknesses , and mainly do the following : 1 . Using the improved direct shear apparatus to test , study static sliding friction between its timeliness piling Tianjin Binhai New Area soil obtained of jacked pile and soil the outer friction angle and its variation , and summed up the mechanism of timeliness of the the jacked pile and the soil friction resistance . The study found that sliding friction resistance and soil type , the normal stress and normal stress approximately linear relationship ; significantly increased with the friction between the time of growth , clay and silt soil and pile and pile bearing capacity growth curve similar . The indoor model tank test of the hydrostatic pile groups in layered soil displacement field , stress field and the excess pore water pressure , a more detailed analysis . Drawn : ( l ) hard and soft soil at the junction of the horizontal displacement of soil variations . (2) the pile group Screens obvious . ( 3 ) hard soil pile penetration level of compressive stress significantly larger . ( 4) As time continues to increase , the pore water pressure gradually dissipated . (5 ) of the soil to be extruded , the outer friction angle has increased , and the degree of change with the increase in the depth of the soil and increase , decreases as the radial distance increases . Pile penetration (6) , the soil around the pile density increased ; the upper part of the soil water content increases , the lower part of the soil moisture content is reduced and smaller with increasing radial distance . Using ABAQUS software to single pile penetration homogeneous soil into a layer of soil two - dimensional axisymmetric finite element model of the real the single pile the continuous penetration homogeneous , layered soil process simulation ; and compared with the model test : both basically the same , the numerical simulation curve is relatively smooth .