在原岩应力，地下水，地质构造和煤层扰动等因素的基础上，根据煤层底板含水层水压不均匀的特点，从渗流场与应力场共同作用的角度出发，建立了底板含水层非均布水压力学模型和倾向条状带的流固耦合模型。根据弹塑性理论求得煤层底板突水的极限水压力的弹性理论解和塑性理论解。运用FLAC3D数值模拟软件对采动工作面底板进行流固耦合数值模拟，分析了采动煤层底板的破坏特征和渗流特性。重点模拟工作面推进过程中非均布水压作用下底板的变形，破坏区域，孔隙水压力的变化等，得出非均布水压力对隔水岩层的破坏影响明显小于均布水压的重要认识。%The seam floor aquifer non-uniform water pressure mechanical model and the separative stripe fluid-structure interaction model were established, basing on the original rock stress, groundwater, geological structure and disturbance of coal seam, according to inhomogeneity of the seam floor aquifer, under the combined action of the seepage field and stress field. This paper found the ultimate water pressure elasticity and plasticity theory solution of coal floor water bursting based on elastic-plastic theory. And the mining working floor was modeled by using the FLAC3D numerical simulation software, modeling the fluid-structure interaction numerical, analyzing the damage characteristics and seepage characteristics of mining seam floor. This paper focused on the floor deformation, destruction area and pore water pressure change during working face advancing, under the non-uniform water pressure, working out the important point that the non-uniform was smaller influence on the destruction of the aquiclude than uniform water pressure.
展开▼
