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由于地下水渗流的作用,充填开采中采场覆岩的蠕变性质会受到影响,从而影响上覆岩层及地表的长期稳定性。从流变力学的一般解法出发,以经典流变力学中的Burgers模型为基础,根据静力平衡方程、有效应力原理、几何方程推导岩石在应力和水压力作用下的应力平衡方程;根据达西定律、渗流场连续性方程以及渗流定解边界条件推导了渗流场控制方程,建立了多孔介质的渗流-蠕变耦合数学模型。以某矿实际地质条件为背景,根据推导建立的渗流-蠕变耦合数学模型,运用多物理场耦合软件Comsol Multiphysics分析计算平台,不同开采方式、不同孔隙水压作用下覆岩蠕变的规律进行了系统的研究。
Due to the effect of groundwater seepage, the creep property of overburden strata in filling mining will be affected, which will affect the long-term stability of overlying strata and ground surface. Based on the general theory of rheological mechanics and the Burgers model in classical rheological mechanics, the stress equilibrium equation of rock subjected to stress and water pressure is deduced according to static equilibrium equation, effective stress principle and geometrical equation. According to Darcy The law of continuity, the continuity equation of seepage field and the boundary conditions of seepage solution are used to derive the control equations of seepage field and establish the seepage-creep coupling mathematical model of porous media. Taking the actual geological conditions of a mine as a background, according to the mathematical model of seepage-creep coupling, the multi-physics coupling software Comsol Multiphysics is used to analyze and calculate the computing platform. The creep law of overlying strata under different mining methods and different pore pressures The systematic research.