地基土沉降对复合地基影响的三维数值模拟  

Three-dimensional numerical simulation of influences of ground subsidence on composite foundation

作　　者：夏力农[1,2] 苗云东[2] 廖常斌[2] 

机构地区：[1]长沙学院土木工程系,长沙410003 [2]湘潭大学土木工程与力学学院,湖南湘潭411105

出　　处：《岩土力学》2012年第4期1217-1222,共6页Rock and Soil Mechanics

基　　金：长沙市科技计划项目;长沙学院引进人才科研基金

摘　　要：通过对复合地基在正常使用条件下和地基土沉降后的三维数值模拟,研究了复合地基由地下水位下降引起的地基土沉陷后的沉降、桩体摩阻力分布和桩身轴力分布的变化。分析表明:随着地基土沉降的增加,加固桩体和基础的沉降加大,中性点位置逐渐下降,桩身轴力有所增大;在加强桩中,中心桩的中性点最低,边桩次之,角桩最高;随着地基土沉降的增加,各桩中性点位置差异逐渐减小,桩体上部负摩阻力作用的桩身长度更长,负摩阻力值逐渐增大。Based on threedimensional numerical simulations of composite foundation both on the condition of ordinary use and ground subsidence, changes of settlement, skin friction distribution and axial force of pile in composite foundation after ground subsidence induced by groundwater level lowering are analyzed. It is shown that, settlement of reinforced pile and foundation increases, and neutral point in pile moves down gradually, axial forces in reinforced pile increase gradually along with ground subsidence increasing. In reinforced piles of composite foundation, neutral point in centre pile is the lowest, neutral point in border pile is the second, neutral point in comer pile is the highest. Along with ground subsidence increasing, the differences of neutral point position in centre pile, border pile and comer pile decrease gradually, the length impacted by negative skin friction of upper part pile over neutral point lengthens zraduallv, value of negative skin friction increases gradually.

关 键 词：地基土沉降 复合地基 三维数值模拟 沉降:摩阻力 

分 类 号：TU478[建筑科学—结构工程]