【摘要】 为探索采空区冒落带内破碎岩体中地下水的渗流特征,建立采空区冒落带内破碎岩体渗透系数与空隙率的相关关系,确定采空区冒落带内破碎岩体的渗透系数值,并基于采空区冒落带内破碎岩体的空隙分布特征与大孔隙非均质多孔介质的水流特征,设计了一套一维渗流柱,采用常水头稳态渗透法对采空区冒落带内破碎岩体的渗透性能以及不同空隙率破碎岩体的渗透系数进行了研究。结果表明:采空区冒落带内破碎岩体中地下水流呈高速非线性渗流特征,地下水流特征明显受渗透介质空隙率与粒径分布的影响;采空区冒落带内破碎岩体的渗透性能总体上随空隙率的增加而增强,其渗透性能分为缓增区和激增区两段;采空区冒落带内破碎岩体不同区域的渗透系数差别较大,采空区中部的重新压实区破碎岩体的渗透系数明显低于两侧的裂隙发育区岩体,说明采动破坏对岩石渗透性的影响很大。更多还原

【Abstract】 In order to obtain the flow charateristics of the groundwater in mining-induced caving rock mass, build the correlation between hydraulic conductivity and voidage of mining rock, and get the hydraulic conductivity coefficient of the caving rock mass in caving zones, this study designs and adopts a one-dimensional flow column, which was based on the fracture distribution characteristics of fractured rock and flow motion of macroporous heterogeneous media in mining-induced caving zones.Using the steady seepage method with constant head, the paper studies the permeability of fractured rock mass in caving zones of goaf and the hydraulic conductivity of fractured rock with various voidage.The experiment results show that the groundwater flow with high-speed in caving zones of goaf presents nonlinear characteristics, and the flow motion is obviously affected by the fracture rate of permeable media and particle size distribution.In general, the permeability of fractured rock mass in caving zones increases with the growth of the fracture rate, and the permeability can be divided into two sections: the slow increasing section and the dramatic increasing section.The hydraulic conductivity of mining-induced rock mass in caving zones varies greatly in different positions with larger one of both sides than that of the middle part.Mining has great influence on rock permeability.更多还原