真空预压加固区硬壳层的水分运移解析解  

Analytical solution of moisture migration in crust layer of vacuum preloading zone

作　　者：吴跃东[1,2] 石晓燕[1,2] 刘坚[1,2] 刁红国 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098

出　　处：《岩土力学》2013年第S2期110-114,共5页Rock and Soil Mechanics

基　　金：国家自然基金(No.51279049);江苏2012年度普通高校研究生科研创新计划(No.CXZZ12_0232)

摘　　要：本文根据非饱和土体的渗流理论,建立水分运移模型,研究真空预压在稳态下的水分运移机制,给出了孔隙水压力分布的控制方程及其解析解。根据工程实测数据验证解析解的结果,并对不同参数进行分析。结果表明:稳态下真空预压水分运移模型计算的结果和现场实测数据基本吻合。扩散通量Q和降饱和系数对上层非饱和区域的形成位置、强度及厚度的影响较大。扩散通量Q越大,土体表层的基质吸力越大,孔隙水压力变化趋势就越大;降饱和系数在0.3~1.0 kPa-1内对非饱和土体部分基本没有影响。Based on flow theory of unsaturated soil, a model for moisture migration is set up to study steady flow subjected to vacuum preloading. Meanwhile the governing equation and the corresponding analytical solution of pore water pressure distribution are given. The model is first verified by in-situ measured data. Then parameters are analyzed. Results show that the calculated results agree well with the in-situ measured data. Both diffusion flux (Q) and unsaturated coefficient (a) have a marked effect on the formation position, indicating that they affect strength and thickness of unsaturated region. The larger diffusion flux is, the larger matrix suction of soil surface is and the greater variation trend of pore water pressure is. Unsaturated soil is seldom influenced by unsaturated coefficientawhen it is in range of 0.3-1.0 kPa-1.

关 键 词：真空预压 硬壳层 水分运移模型 孔隙水压力 

分 类 号：TU472.33[建筑科学—结构工程]