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为了探明巨厚煤层开采过程中不同分层高度对底部煤炭破坏深度的影响关系,以新疆大井矿区B1巨厚煤层(58 m)为研究对象,采用理论分析和数值模拟的方法,分别进行了5、10、15 m 3种采高下的模拟开采,着重分析了底部煤层中垂直应力和剪应力的分布特征及其演变过程,阐明了底煤破坏的原因及分布特点。研究结果表明:剪切破坏是底煤破坏的主要形式,易发生在采空区四周,张拉破坏易发生在采空区中部;底煤的破坏深度一般随采高的增大而加深,且成盆状分布。
In order to find out the effect of different strata height on the destruction depth of bottom coal during the process of mining thick and thick coal seam, taking the B1 thick and thick coal seam (58 m) in Dajing Mining Area of Xinjiang as the research object, by theoretical analysis and numerical simulation, 5,10,15 m3 mining and mining under the conditions of mining, analyzes the distribution characteristics and evolution process of vertical stress and shear stress in the bottom coal seam, and elucidates the reason and distribution characteristics of the bottom coal destruction. The results show that shear failure is the main form of bottom coal destruction, and it is easy to occur around the goaf. Tensile failure is easy to occur in the middle of the goaf. The depth of bottom coal destruction generally deepens with the increase of mining height Into the basin-like distribution.