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我国华北型矿区均受石炭二叠纪煤系底部的太灰、奥灰强含水层影响。为分析带压开采过程中,受采动应力及水压双重作用下,煤层底板隔水层承载变形特征及其破坏机理,设计了承压水自动加载系统,通过物理模拟试验再现底板隔水层重复采动影响下裂隙萌生、扩展、贯通等破坏失稳过程。明确底板不同层位的裂隙分布及其形成机理,并通过全场位移监测系统得出底板岩层移动变形规律及位移分区特征。
The North China-type mining areas in China are all affected by the too-gray and the Ot-rich aquifer at the bottom of the Carboniferous Permian coal measures. In order to analyze the bearing deformation mechanism and the failure mechanism of coal floor under the double action of mining stress and water pressure in the process of belt compression mining, a system of automatic pressure bearing water loading was designed. Mining under the influence of cracks initiation, expansion, through the destruction of instability process. The fissure distribution and formation mechanism of different layers of floor are clarified, and the displacement and deformation characteristics of floor rock are obtained through the displacement monitoring system.