降雨是导致重庆山区矸石山失稳的主要诱发因素,针对重庆山区矸石山,分析其降雨入渗过程及其影响因素,以Navier-Stocks方程为基础,按照流体动力学原理,应用C语言编制了二维平面内矸石山降雨入渗的数值模拟程序,计算降雨入渗过程中水分在矸石山内的运移规律,并由此计算矸石散体中的孔隙水压力变化;其次,采用FLAC~(2D)两相流渗流分析模块进行矸石山降雨入渗数值模拟,充分考虑水气两相流动,并选择与应力耦合的算法;最后,将非饱和土中的相关理论引入,考虑基质吸力对矸石散体强度的影响,采用极限分析方法分析矸石山体在降雨各阶段的安全储备,并且采用FLAC~(2D)对降雨情况下重庆山区矸石山的应力-应变状态进行计算,矸石散体的应力-应变模式采用非线性模拟,得出的计算结果与极限分析的计算结果一致.%Rainfall is the main factor leading to the instability of gangue hills in the Chongqing area. The process of rainfall infiltration and its influence are analyzed for coal waste dumps in Chongqing. A 2-D numerical simulation code for waste dump rainfall infiltration is developed for calculation of water flow and the change of pore water pressure in the waste granular media during rainfall. The governing equation, numerical formula and the stress-coupling formula for two-phase flow in FLAC~(2D) are presented. Considering the effect of suction on the strength of waste granular media, the limit analysis method is employed to analyze the slope safety factors of different rainfall phases. The stress-strain states of coal waste dumps in the Chongqing mountainous area during rainfall are calculated by using nonlinear simulations. The result of FLAC~(2D) calculation is the same as that of limit analysis.
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