多年冻土地区工程桩桩侧冻结力数值分析  

Numerical analysis of adfreezing force of engineering pile in permafrost

作　　者：徐春华[1] 徐学燕[1] 邱明国[1] 慕万奎 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]黑龙江省交通科学研究院,哈尔滨150080

出　　处：《哈尔滨工业大学学报》2007年第4期542-545,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(40571032);西部交通建设科技资助项目(200231877406)

摘　　要：依据侧向冻结力试验无厚度的非线性接触面单元模拟桩土界面,采用双曲线非线性模型冻土本构关系编制三维非线性有限元程序.数值分析得P-s曲线与现场静载试验P-s曲线吻合程度良好,结果表明:桩周冻土温度、桩径、桩长强烈影响着桩侧冻结力的分布状态,得到桩侧冻结力的分布影响规律;增大桩径是提高工程桩承载力、减小沉降量的有效措施;增大设计桩长对提高工程桩承载力贡献较小.Based on adfreezing force with frozen soil and concrete test data, contact elements of zero thickness imitating interface of pile and permafrost are inducted, and bi -linear constitutive relations are introduced as nonlinear constitutive relations of soil elements and interface elements in order to consider permanent displacement. A 3 - D nonlinear FEM program is also developed. The calculated load - settlement curve and that ob- tained from in - situ test are in well agreement, which verifies the model. The distribution status and the variation laws of adfreezing force are considerably affected by ground temperature, pile diameter and pile length. When pile diameter increases, the bearing capacities of piles can be improved. Increasing pile length makes a little contribution to improve the bearing capacity.

关 键 词：多年冻土 冻结强度 桩侧冻结力分布 三维非线性有限元 

分 类 号：TU445[建筑科学—岩土工程]