【摘要】 基于多孔介质流体动力学理论,建立了降雨条件下垃圾填埋体内水分传输的流-固耦合模型,并采用交替有限差分方法给出了耦合模型的数值格式;通过开发的计算程序,模拟了降雨条件下垃圾坝体范围内孔隙水压力和流速分布情况。数值模拟的结果表明:持续的降雨会加大对孔隙介质的载荷作用,填埋介质被压缩,使土壤颗粒间基质吸力减少,导致水流渗透率降低。同时,填埋介质变形影响了孔隙水压力和水流速的分布规律。因此,在垃圾坝体稳定性分析研究中,渗流场和应力场的耦合效应不能忽略,其研究可为评价垃圾坝体的稳定性及预测预报坝体滑坡提供技术支持。更多还原

【Abstract】 Based on the theory of dynamics of fluids in porous media,a coupled mathematical model for describing moisture movement under rainfall condition in unsaturated zone is built.The numerical format is given using ADI finite difference method.The distribution law of pore-water pressure and velocity in landfill dam are presented under the conditions of rainfall.Numerical results show the load on pore media was enlarged under continuous rainfall infiltration condition.Landfill media was compressed which lessen the matrix suction between soil particle and causing the decreasing of fluid permeability.Moreover,the landfill media deformation has an obvious influence on distribution law of pore-water pressure and fluid velocity.Therefore,the coupling effects of stress field cannot be neglected.It provides theoretical evidence for quantitative assessment of the stability of landfill dam and forecasting bam landslide.更多还原