竖向荷载作用下单桩工作性能模拟分析  

Behavior of single pile foundation under vertical load

作　　者：王幼青[1,2] 张克绪[3] 

机构地区：[1]中国地震局工程力学研究所 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]哈尔滨工业大学土木工程学院

出　　处：《哈尔滨工业大学学报》2002年第5期667-670,共4页Journal of Harbin Institute of Technology

摘　　要：为了分析单桩的工作性能 ,采用非线性水平有限层单元模拟桩周围土体 ,假定其竖向变形沿径向按指数函数变化 ,考虑沿径向的剪切作用及在竖向的压缩作用建立其刚度矩阵 .以非线性的接触面单元模拟桩土界面的力学性能 ,以修正桩底土刚度的办法模拟桩端阻力的非线性性能 ,这样建立的模拟分析方法能够较真实地反映单桩 -土体系的工作性能 .In order to study the behavior of a single pile foundation, a nonlinear horizontal finite layer element was used to simulate the soil around the pile, and to let the vertical deformation vary in an exponential function in the diametric direction. A stiffness matrix of soil element was built with a shear action in the diametric direction and with a compression action in the vertical direction. Mechanical behavior of soil-pile interface was simulated by a nonlinear interface element, and the nonlinear property of pile tip resistance was simulated by correcting the stiffness of soil under pile tip. The behavior of pile-soil system under the vertical load could be depicted more authentically. Two large-diameter prototype single pile tests were made in a real engineering and were analyzed by this simulating method, and satisfactory results were obtained. It was proved that the method is reasonable in theory and feasible in practice.

关 键 词：竖向荷载 工作性能 桩侧阻力 桩端阻力 剪切变形 接触面单元 模拟分析 大直径灌注桩 荷载-沉降关系 

分 类 号：TU473.1[建筑科学—结构工程] TU413.4[建筑科学—土工工程]