竖向受荷桩的桩-土接触面简化模型  

A Simplified Model of Soil-pile Interface of Pile Under Vertical Loads

作　　者：潘玉涛[1] 郑俊杰[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《土木工程与管理学报》2011年第4期16-19,共4页Journal of Civil Engineering and Management

基　　金：武汉市科技攻关计划(200860423194);新世纪优秀人才支持计划(NCET-06-649)

摘　　要：将桩-土接触面由一个理想弹塑性的切向弹簧简化为一层薄壁单元,通过理论分析的方法,在Desai薄层单元法的基础上进行改进,考虑桩径与薄壁单元厚度对单元参数的影响,给出一种弹簧切向刚度与薄壁单元剪切刚度的换算式。数值模拟结果表明,该模型在薄壁单元厚度和桩径在一定范围内变化时模拟结果稳定,其竖向位移分布规律与接触面弹簧模拟结果非常相似;通过改变薄壁单元的强度参数,可以模拟桩-土接触面的强度性质,从而能够较合理地预测桩-土接触面在竖向荷载作用下的变形性状。A soil-pile interface is simplified from an elastic-perfectly plastic tangential spring to thin-layer elements. By theoretical analysis, considering the influence of pile diameter and thickness of thin-layer elements, a modified formula based on the Desai method is presented to describe the relationship between the tangential stiffness of springs and shear modulus of thin-layer elements. Numerical analyses show that the calculation results of this method are stable when the thickness of thin-layer elements and the pile diameter vary within a certain range, the distribution law of vertical displacement calculated using this method is very similar to that of interface spring. It can simulate the property of interface strength by changing the values of strength of thin-layer elements. Thus the method presented in this paper can factually reflect the defomaation behaviour of soil-pile interface when the pile is subjected to vertical loads.

关 键 词：桩-土接触面 薄壁单元 数值模拟 竖向荷载 

分 类 号：TU473[建筑科学—结构工程]