降雨是导致重庆煤矿采区矸石山失稳的主要诱发因素,本文将Green-Ampt入渗模型和非饱和土中的相关理论引入,进行矸石散体的降雨稳定性计算;并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坡体在降雨各阶段的安全储备;通过对降雨情况下矸石山应力状态、位移状态的计算,提出了两个必须考虑的因素即基质吸力不仅对强度有影响,而且对变形参数、屈服准则也有影响;矸石散体的固结影响了其渗透能力。 Rainfall is the main inducing factor of instability of coal gangue in mining area of ​​Chongqing. In this paper, the Green-Ampt infiltration model and related theories in unsaturated soils are introduced to calculate the rainfall stability of gangue dispersion. Considering the influence of substrate suction on gangue And the strength of the soil, the limit analysis method was used to analyze the safety reserve of gangue hillside body in all stages of rainfall. Based on the calculation of stress state and displacement state of gangue hill under rainfall, two factors that must be considered, namely, matrix suction, Strength and impact, but also on the deformation parameters, yield rules also have an impact; consolidation of waste rock waste affects its ability to penetrate.