巨厚煤层分层采高对底煤破坏深度的影响

Influence of Mining Height on Failure Depth of Lower Slicing Coal in Ultra-thick Seam

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。

Utilized the numerical simulating technique to study the influence of mining height on the failure depth of lower seam coal. B1 Ultra-thick seam （58 m）of Xinjiang was chosen to study the mining with different heights, which is 5,10,15 m respectively. Analyzed the character of vertical stress and shear stress. The result shows that shear failure is the mainly way and it＇s wildly distribute around the mine goal, the tensile failure mainly appear in the center of the mine goaf; the bigger of the mining height, the deeper of the failure in lower slicing coal.