多年冻土地区工程桩竖向承载力三维数值分析  

3D Numerical Analysis of Vertical Bearing Capacity of Engineering Pile in Permafrost Regions

作　　者：徐春华[1] 孙建波[1] 徐学燕[2] 

机构地区：[1]哈尔滨工业大学建筑设计研究院,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《施工技术》2011年第4期50-53,共4页Construction Technology

基　　金：铁道部科技开发计划项目(2006G001-B-3)

摘　　要：根据冻土与混凝土圆柱间冻结强度试验,得出冻土温度对冻结强度影响强烈的特点。将混凝土灌注桩、桩周冻土及桩土接触面简化成有限元集合体,编制了三维非线性有限元程序。计算的荷载-沉降曲线与漠河多年冻土区现场试验荷载-沉降曲线吻合程度良好,验证了该模型的适用性;对不同的冻土温度、桩径、桩长等因素进行了参数影响分析,得到对桩承载力影响规律,并相应地提出提高多年冻土地区单桩承载力的设计原则。Based on freezing strength test data with frozen soil and concrete cylinder,the results indicate that main influencing factor to freezing strength is temperature of frozen soil.Concrete pile,surrounding frozen soil and pile-soil contact surface are simplified as FEM system,and a 3D nonlinear FEM program is also developed.The calculated load-settlement curve and that obtained from in-situ test of Mohe frozen soil are in well agreement,which verifies the model.Parametric analysis is carried out concerning different influencing factors like ground temperature,pile diameter and pile length,etc.The variation laws of bearing capacity for concrete pile and corresponding design principles are suggested as well.

关 键 词：多年冻土 冻结强度 桩基 承载力 三维非线性有限元法 

分 类 号：TU473.1[建筑科学—结构工程]