摘要
考虑了桩体内径竖向组合渗流和涂抹区土体水平渗透系数的两种变化模式,得到了此类固结问题的控制方程.采用新的初始条件,得到了控制方程的解答,给出了桩周土体和桩体内的平均孔压.在此基础上,把桩体的固结压缩引入对复合地基总平均固结度的定义中,分别给出了复合地基按应力和按应变定义的总平均固结度.结果表明:按应力和按应变定义的复合地基的总平均固结度相等;考虑桩体内径向渗流比不考虑桩体内径向渗流的复合地基固结度要小,而且随着桩间距的增大,两者之间的差值逐渐减小;考虑涂抹区水平渗透系数逐渐变化比假定涂抹区水平渗透系数保持不变的复合地基的总平均固结度大.
The governing equations were derived for the consolidation of a stone column reinforced foundation by considering both horizontal and vertical flows within the column with two variation patterns of soil permeability within the disturbed soil zone. Utilizing a new initial condition, the solutions for the average excess pore water pressures at any depth within soil and column were obtained. Then, taking into account the consolidation compression of column, the overall average degrees of consolidation （OADC） of compound foundation were given in terms of stress and strain, respectively. Numerical results show that both definitions of OADC are equal with each other, and OADC with radial flow within column is smaller than that without radial flow. Furthermore, the difference in OADC between these two cases decreases with increasing column spacing. OADC with consideration on the gradual variation of horizontal permeability of soil in disturbed zone is greater than the one without considering the horizontal permeability variation.
出处
《固体力学学报》
CAS
CSCD
北大核心
2009年第2期155-161,共7页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金项目(50679074)资助
关键词
固结
复合地基
径向渗流
水平渗透系数
consolidation, composite foundation, radial flow, horizontal permeability
