桩土界面参数对单桩极限承载力的影响  

Influence of Pile-soil Interface Parameters on Ultimate Bearing Capacity of Single Pile

作　　者：吴承亮 邬远康 赵川 WU Chengliang;WU Yuankang;ZHAO Chuan(Shanghai Highway and Bridge(Group)Co.,Ltd.,Shanghai 201611,China;School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海公路桥梁(集团)有限公司,上海201611 [2]上海大学力学与工程科学学院,上海200444

出　　处：《华南地震》2022年第1期113-118,共6页South China Journal of Seismology

基　　金：国家自然科学基金项目(51678352)。

摘　　要：桩土相互作用效果是研究桩基础的关键因素,而桩土界面参数的确定极大的影响了该界面的性质。为了探明桩基础在不同的界面抗剪强度指标下的强度特性,依托巢湖市滨湖景城安置房工程,以有限差分软件FLAC3D为平台,采用两种荷载传递模型对比分析了不同界面黏聚力与内摩擦角对单桩极限承载力的影响规律。研究结果表明:在FLAC3D中采用双曲线模型比理想弹塑性模型能够更好的模拟桩土相互作用;在一定范围内,增大桩土界面黏聚力和内摩擦角,单桩极限承载力都有增大的趋势,且增大趋势逐渐减少,黏聚力对单桩极限承载力影响较为明显;桩土界面黏聚力和内摩擦角变化主要提升桩体桩侧摩阻力影响单桩极限承载力。The effect of pile-soil interaction is the key factor in the study of pile foundation,and the determination of pile-soil interface parameters greatly affects the properties of pile-soil interaction.In order to find out the strength characteristics of pile foundation under different interface shear strength parameters,two load transfer models are used to compare and analyze the influence of different interface cohesion and internal friction angle on the ultimate bearing capacity of single pile based on the Chaohu project in FLAC3D.The results show that the hyperbolic model can better simulate the pile-soil interaction than the ideal elastic-plastic model in FLAC3D.In a certain range,the ultimate bearing capacity of single pile tends to increase when the cohesion and internal friction angle of pile-soil interface are increased,and the increasing trend decreases gradually.The influence of cohesion on the ultimate bearing capacity of single pile is more obvious.The cohesion and internal friction angle of pile-soil interface increase the change of internal friction angle mainly affects the pile side friction.

关 键 词：桩土相互作用 荷载传递模型 桩土界面参数 单桩极限承载力 

分 类 号：TU745.3[建筑科学—建筑技术科学]