Research on the application of pit type static pressure pile in foundation reinforcement technology in loess regions
There are unfavorable geological conditions such as collapsible loess in the central and western regions of China.The static pressure pile replacement technology has provided great help in solving the problem of uneven settlement of foundations in loess areas.Currently,there is a lack of quantitative analysis and comparison with engineering practice when analyzing the resistance characteristics of static pressure pile sinking.Therefore,this article starts from practical engineering and analyzes the comparison between the theoretical and actual values of pile resistance in static pressure pile construction.Through numerical simulation software,the horizontal compressive stress,vertical stress,plastic strain,effective stress at the pile tip of the soil during static pressure pile construction are analyzed.Research has found that the static pressure pile foundation support technology is flexible and simple,with less disturbance to the soil.This method has been successfully applied in collapsible loess areas.The value of the correction coefficient for pile end resistance has a significant impact on the calculation results,with larger values for clay and silt,and more conservative values for sand and pebble layers.During the compression process,the disturbed soil is within a range of about range of a pile's diameter and will not damage the stability of the original foundation soil.It can provide reference for similar projects in loess areas.
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