地震作用下欠固结土桩基响应数值分析  

Numerical Analysis of Interaction Response of Less Consolidation Soil and Pile Under Earthquake Load

作　　者：李正明 林杭[2] 

机构地区：[1]湖南长沙高速公路建设开发有限公司,长沙市410100 [2]中南大学资源与安全工程学院,长沙市410083

出　　处：《公路》2013年第2期24-29,共6页Highway

基　　金：湖南省自然科学基金资助项目;项目编号11JJ4043;中南大学自由探索计划资助;项目编号2011QNZT086

摘　　要：为了研究地震作用下桩-土相互作用响应情况,采用FLAC3D数值计算软件,建立欠固结土-桩体模型,分析地震作用下,不同时间段桩侧摩阻力、桩体轴力和土体应力变形情况。结果表明:由于地震波的往复运动,引起土体水平和竖直方向的位移也发生往复变化,易导致不同位置土体发生不均匀沉降和水平剪切运动,设计时需考虑地震作用效应所导致地基与基础的不均匀沉降和水平剪切作用。但桩侧摩阻力和中性点受到地震的影响较小,因此,对这两方面进行设计时,可减少地震因素的考虑。In order to study the earthquake effect on the response of pile soil interaction, FLAC3D numerical calculation software is used to build the less consolidation soil-pile foundation model. Analysis is done for the seismic effect on the pile skin friction, pile axial force and stress deformation situation of soil at different phases. The results indicate that, due to the reciprocating movement of the seismic wave, the soil occurs the corresponding horizontal and vertical displacement, which will easily cause the uneven sub- sidence and horizontal movement of soil. So it is necessary to consider the earthquake effect on the ground and foundation uneven settlement and horizol＇ltal movement in designing. Pile skin friction and neutral point are less influenced by the earthquake load, accordingly, to these two aspects of the design, it can reduce the factors of earthquake in consideration.

关 键 词：欠固结土 桩土 地震 摩阻力 轴力 变形 

分 类 号：TU473.1[建筑科学—结构工程]