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在对矿区地质条件、采矿情况以及监测资料分析的基础上,提出了悬臂梁的力学模型。该悬臂梁是由NWW向节理切割下盘的花岗岩岩体而产生。地下采矿引起的岩层移动分为两个阶段,筒状破坏延伸到地表之前为第1阶段;筒状破坏延伸到地表后,则进入第2阶段。筒状破坏延伸到地表使水平构造应力释放,悬臂梁受力发生变化,而发生弯曲折裂变形和破坏,从而形成了深部岩体破坏的4个区:破裂岩体区、破裂过渡带、变形区和未扰动岩体区。通过对矿区地表测点所测数据进行分析,结合上述岩层移动机制和裂缝产生过程,将变形区域划分为:变形累积区、裂缝产生区、裂缝扩展区和裂缝闭合区。随着采矿的进行,深部岩体4区将逐渐向下延伸,地表4区将逐渐向外扩展。
Based on the analysis of geological conditions, mining conditions and monitoring data, a mechanical model of cantilever beam is proposed. The cantilever is produced by NWW cutting the granitic rock mass of the lower plate. Underground rock movement caused by underground mining is divided into two stages, before the cylindrical damage extends to the surface of the first stage; cylindrical damage extends to the surface, then enter the second stage. Tubular failure extends to the surface to release the horizontal structural stress and change the stress of the cantilever beam, resulting in bending fracture deformation and failure, resulting in the formation of four zones of deep rock failure: rupture zone, rupture zone, deformation zone and Uneven rock mass area. By analyzing the measured data from the surface measuring points in the mining area, the deformation area is divided into deformation accumulation area, crack generation area, crack extension area and crack closure area by combining the above-mentioned rock movement mechanism and crack generation process. With the progress of mining, the deep rock mass 4 area will gradually extend downward, surface 4 area will gradually outward expansion.