灌注桩桩侧泥皮性质对桩承载性状影响研究  

Analysis on Side Mud Influence on Bearing Capacity of Bored Pile

作　　者：董志高 付婷婷 洪晓珍[3] 董平[4] 

机构地区：[1]南京南大岩土工程技术有限公司,江苏南京210024 [2]南京佳的建筑设计事务所有限公司,江苏南京210008 [3]福建省建筑科学研究院,福建福州300025 [4]南京大学地球科学与工程学院,江苏南京210008

出　　处：《建筑科学》2014年第9期16-21,共6页Building Science

摘　　要：灌注桩桩侧泥皮的存在对桩承载力影响很大,分析泥皮性状对桩承载性状影响具有非常重要的实用价值.本文采用折减桩土接触面系数方法进行考虑泥皮对钻孔灌注桩承载性状的数值分析.研究结果表明：通过折减桩土接触面模拟泥皮性状是可行的;当泥皮效应比值α在0.3 ～0.8时,极限承载力损失约在10％～ 50％;对桩侧某一点,α值和剪应力呈线性关系;对同一加载条件下,α值越大,剪应力越大,相应竖向位移越小.因此,分析钻孔灌注桩受力特征和工程安全时,应充分考虑泥皮作用影响.It is a very important practical significance to analyze the side mud characteristics on the impact of bearing capacity of pile, which will reduce the capacity of bored pile. The method by reduction coefficient of pilesoil interface is used to analyze the bearing properties of pile with finite element method when side mud is presence. The results show that ： the method by reduction coefficient of pile-soil interface to simulate the behavior of side mud is feasible. When the effect ratio of side mud α is in 0. 3 - 0. 8, the loss of ultimate bearing capacity is about 10% - 50%. It is in a linear change between the shear stress and value α for one point on the pile. Under the same vertical loads, value α is greater, the greater the shear stress is, and the smaller the vertical displacement is. Therefore, the role of side mud should be taken into account, when analyzing the load characteristics and engineering of bored pile.

关 键 词：钻孔灌注桩 泥皮 泥皮效应比值 有限元 承载特性 

分 类 号：TU473.14[建筑科学—结构工程]