Dissertation > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile

Research on Squeezing Effects of Jacked Pile in Layered Soil Based on the Model Test and Finite Element Simulation

Author SunXiaoDong
Tutor LuQun
School Tianjin Institute of Urban Construction
Course Geotechnical Engineering
Keywords Static pressure pile group In layered soil Soil compaction effects Model test Sliding friction Timeliness
CLC TU473.1
Type Master's thesis
Year 2010
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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 .

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