基于“等效阻水厚度”保水理论的浅表水资源承载力研究

Water Resources Carrying Capacity of Shallow Coal Seams Based on the“Equivalent Water Resistance Thickness”Water Protection Theory

为研究4301工作面浅表水资源承载力,基于“等效阻水厚度”保水开采理论确定了保水开采的临界条件,测试了顶底板关键岩层的力学性质和水理特性,采用UDEC数值模拟软件对工作面回采过程上覆岩层的移动特征进行研究。数值模拟结果表明:工作面上覆岩层导水裂隙最大发育高度为75 m,地表冲沟区域最大下沉量为2.85 m。通过在地表布置走向及倾向观测线,观测到地表最大下沉量为2.78 m,表明:4301工作面回采对浅表水资源的破坏程度在承载力范围内。

To study the water resources carrying capacity of the shallow coal seam at 4301 working face,based on the“equivalent water resistance thickness”theory,this study determined the critical conditions for water protection mining,tested the mechanical properties and hydrological characteristics of key strata of roof and floor,and studied the movement of overlying strata during coal mining by numerical simulation software UDEC.The numerical simulation results show that the maximum development height of hydraulic fissures in the overlying strata is 75 m,and the maximum subsidence in the surface gully area is 2.85 m.The maximum subsidence of the surface is 2.78 m by arranging strike and tendency observation lines on the surface.The research shows that the damage to the water resources in shallow coal seams caused by the 4301 working face mining is within the carrying capacity.