非饱和土的变形与渗流耦合的一维解析分析及参数研究  

One-dimensional analytical analysis and parameter study of coupled deformation and seepage in unsaturated soils

作　　者：吴礼舟[1] 张利民[2] 黄润秋[1] 许强[1] 

机构地区：[1]成都理工大学地质灾害防治国家重点实验室,四川成都610059 [2]香港科技大学土木系

出　　处：《岩土工程学报》2009年第9期1450-1455,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家科技支撑计划项目(2008BAC47B01);香港Research Grants Council项目(622207);国家自然科学基金项目(40572163);留学人员择优资助项目

摘　　要：一维的渗流和变形耦合的解析解通过Fourier积分变化获得。指数函数可用来表达水力传导率和孔隙水压力的关系,及土水特征曲线。此解析解考虑了任意初始的孔隙水压力分布和流量边界条件。解析分析表明,渗流和变形耦合对非饱和土中水的入渗产生重要的影响。在渗流的早期阶段,耦合与非耦合情况下的差异随着时间变化显著;随着趋近于稳定状态,这差异逐渐消失。进一步分析了耦合解的各个参数的影响。降雨强度与渗透系数的比值(q/ks)对耦合的渗流和变形产生较大的影响。耦合与非耦合之间的差异与去饱和系数(desaturation coefficient)有关。By a Fourier integral transform, an analytical solution to 1D coupled seepage and deformation is obtained. The permeability coefficient and pore-water pressure relationship, and the soil-water characteristic curve are represented using exponential functions. Arbitrary initial pore-water pressure distributions and flux boundary conditions are considered in the analytical solution. The analytical analysis demonstrates that the coupling of seepage and deformation plays an important role in rainfall infiltration in unsaturated soils. In the early stage of water infiltration, the difference between the coupled and uncoupled conditions becomes marked over time, and in the late stage, the difference caused by the coupling diminishes towards the steady state. The effect of the parameters on the governing equations is also analyzed. The ratio of rainfall intensity to saturated permeability （q/ks） also has a strong influence on the coupled infiltration and deformation in unsaturated soils. The difference between the uncoupled and coupled conditions is closely linked with the decreasing desaturation coefficient （α）.

关 键 词：变形和渗流 耦合 非饱和土 降雨入渗 

分 类 号：TU411.4[建筑科学—岩土工程]