Research On Side Friction Of Old Clay Soil Pile In Changchun Area

With the continuous development of urbanization construction in China,tall buildings emerge constantly,shallow foundation can not meet the requirements,and pile foundation,as an important form of deep foundation,has the advantages of strong bearing capacity and small settlement.It is the most widely used deep foundation form in engineering at present.Because the old clay soil is the most commonly used soil layer in the engineering construction in Changchun area,but for many years,the measurement and experimental research on the friction resistance of pile side is lacking,and the interaction between pile and soil is more complicated.In order to obtain the value range of pile side friction in old cohesive soil layer in Changchun area,and compare with the current pile foundation technical code,the theoretical and experimental research is carried out in this paper.In the field of research,special research has been carried out.In this paper,the engineering characteristics of the old clay in Changchun area and the research status of pile side friction are described in detail,and then the main calculation methods of pile side friction are summarized.Combined with the exertion mechanism of pile side friction,the main influencing factors are analyzed and studied,and then the author uses the foundation pile in Jilin Construction University School to test the training base,and carries out the single pile vertical compressive static load test.In this paper,the problem of pile side friction in the old clay layer in Changchun area is studied by field test.The paper analyses the proportion of pile side friction in the bearing capacity of single pile in Changchun area,and draws a conclusion that it is more suitable for the old clay soil in Changchun area.The empirical formula of pile side friction calculation provides technical support for pile foundation design and pile foundation construction in engineering construction in Changchun area.Finally,the author uses FLAC3 D software to carry out numerical simulation to establish a single pile model.The distribution law of pile top settlement,pile axial force and pile side friction under different vertical loads are analyzed.