摘要
基于ANSYS有限元软件平台,建立多年冻土区灌注桩桩–冻土相互作用有限元模型。通过面–面接触实现桩与冻土间黏结、滑移和开裂的状态模拟,给出接触参数的合理取值,并将其对P-S曲线的影响进行分析。结合工程实例,对多年冻土区灌注桩基础在垂直静载作用下的内力和沉降进行分析研究。研究结果表明:多年冻土区桩基的承载力主要由桩侧冻土层的黏聚力提供;三维高阶接触单元能较好地模拟桩与冻土系边界条件的非线性,真实地反映多年冻土区单桩的实际受力状态;有限元计算值与实测值吻合较好,从而证明模型建立的正确性。
Based on the commercially available finite element analysis program ANSYS,a finite element model of single pile-frozen soil interaction in three-dimensional system of frozen soil is established.The states of conglutination,slippage,and cracking between pile and frozen soil are simulated by the surface-surface contact.The reasonable values of contact parameter are given,and their influences on the P-S curve are analyzed.Both the experiments and the theoretical analysis are conducted to study the stresses and settlements of bored pile foundation under static axial load in the frozen soil.The results show that the bearing capacity of pile foundation in permafrost is mainly provided by the cohesion of layered frozen soils;three-dimensional high-order contact elements are able to stimulate the nonlinear boundary condition of the pile-frozen soil,and correctly reflect the stress states of the single pile in permafrost region.The finite element results are in good agreement with the experimental data.Accordingly,the validity of the model is verified.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第A01期3134-3140,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
交通部西部交通建设科技项目(200231877406)
关键词
数值分析
多年冻土
桩基础
桩-冻土相互作用
沉降
numerical analysis
permafrost
pile foundations
pile-frozen soil interactions
settlements
