The Value Range of Contact Stiffness Factor between Pile and Soil Based on Penalty Function

3rd International Conference on Energy Equipment Science and Engineering

Chen, Sandy H. L.^1 ; Wu, Xinliu^2

School of Science, Tianjin Chengjian University, Tianjin

300384, China^1

Third Railway Survey and Design Institute Group Corporation, Tianjin

300142, China^2

关键词: Contact pressure and penetrations;    Contact stiffness;    Elastic deformation stage;    Finite element software;    Linear elastic model;    Plastic strain range;    Reasonable value;    Stiffness factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012101/pdf
DOI  :  10.1088/1755-1315/128/1/012101

来源: IOP

【 摘 要 】

The value range of contact stiffness factor based on penalty function is studied when we use finite element software ANSYS to analyze contact problems, take single pile and soil of a certain project for example, the normal contact between pile and soil is analyzed with 2D simplified model in horizontal load. The study shows that when adopting linear elastic model to simulate soil, the maximum contact pressure and penetration approach steady value as the contact stiffness factor increases. The reasonable value range of contact stiffness factor reduces as the underlying element thickness decreases, but the rule reverses when refers to the soil stiffness. If choose DP model to simulate soil, the stiffness factor should be magnified 100 times compares to the elastic model regardless of the soil bears small force and still in elastic deformation stage or into the plastic deformation stage. When the soil bears big force and into plastic deformation stage, the value range of stiffness factor relates to the plastic strain range of the soil, and reduces as the horizontal load increases.