摘要
假定土体在固结过程中压缩性和渗透性的变化成正比,基于e-lgsσ'及e-vlgk_v关系,推导出饱和软土成层地基一维非线性固结解析解,分别给出了按沉降定义和按有效应力定义的每层土平均固结度及整个土层总固结度的计算公式。采用Fortran语言编制了相应的计算程序,将计算得到的结果与已有双层地基一维非线性固结解析解计算结果进行比较,验证该解析解的正确性。利用该程序分析成层地基一维非线性固结性状,分别讨论了初始竖向渗透系数、初始体积压缩系数、荷载值及土层厚度对地基固结性状的影响。分析结果表明:在成层地基一维非线性固结过程中,初始竖向渗透系数对超静孔压的影响较为复杂,对上下层地基固结速率影响不同;初始体积压缩系数增大,超静孔压增大,固结速率变小;所加荷载值越大,超静孔压消散越慢,固结发展越慢;超静孔压消散速率不仅取决于土层厚度,同时取决于各层土渗透性的相对大小。
Adopting the hypotheses that the variation of compressibility is proportional to permeability, and based on e-lg？ ？ and e-vlgk relationships, analytical solutions are derived for one-dimensional nonlinear consolidation of saturated soft layered soils. The average degrees of consolidation of each layer and whole layered soils are defined in terms of settlement and effective stress respectively. A relevant computational program is developed by Fortran in this paper, and the solutions are verified by comparing with the existing analytical solutions for the one-dimensional nonlinear consolidation of double-layered soils. It is shown that in the process of the nonlinear consolidation of layered soils, the influence of the permeability is complex. The influence of permeability on the excess pore water pressure in the upper and the lower layers is different. The larger compressibility is, the greater the excess pore water pressure is, and the slower the rate of dissipation of the excess pore water pressure and greater the value of loading generate slow dissipation of the excess pore water pressure, and the slow consolidation process. The rate of dissipation of the excess pore water pressure depends not only on the layers thickness, but also the relative value of permeability of each layer soil.
作者
夏长青
胡安峰
崔军
吕文晓
谢康和
XIA Chang-qing;HU An-feng;CUI Jun;Lü Wen-xiao;XIE Kang-he(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou,Zhejiang 310058,China;Institute of Urban Construction,Hangzhou Polytechnic,Hangzhou,Zhejiang 311402,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第8期2858-2864,共7页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.51778572
No.51278453)
教育部博士点基金资助项目(No.20120101110029)~~
关键词
饱和软土
成层地基
非线性固结
解析解
固结性状
saturated soft soils
layered soils
nonlinear consolidation
analytical solutions
consolidation behavior
