空场嗣后充填采矿法对围岩及地表的影响规律研究

空场嗣后充填采矿法对围岩及地表的影响,利用正交试验设计方法,研究不同矿房、矿柱尺寸,以及充填体不同沉降率时,围岩及地表的应力应变显现规律。结果表明,顶板拉应力值的大小不仅仅跟采场跨度有关,与矿柱尺寸、充填体是否接顶及沉降率密切相关。从整体位移可以看出,不同计算方案,地表或多或少都会出现沉降变形,位移最大位置出现在矿体开挖上部。同一计算方案不同位置位移量存在关系:矿房位移矿柱位移地表位移。在上下盘断层位置处,均出现明显的位移阻隔现象。矿房尺寸相同的条件,位移量随着矿柱尺寸的增大而减小。矿房尺寸大于一定值时,矿体的开采将会对地表产生影响,存在一定安全隐患。

Research on the influence rule of open field backfill mining on surrounding rock and surface

the effect of open-field backfilling mining method on surrounding rock and surface is studied by using orthogonal test design method. The stress and strain laws of surrounding rock and surface are studied when different sizes of ore house and pillar and different settlement rates of backfill. The results show that; The value of roof tensile stress is not only related to stope span,but also closely related to pillar size, roof connection of backfill and settlement rate.From the overall displacement, it can be seen that, with different calculation schemes, subsidence deformation will occur on the surface more or less, and the maximum displacement occurs on the upper part of ore body excavation. In the same calculation scheme, there is a relationship between the displacement at different positions: Room displacement > pillar > displacement > surface displacement.At the position of the upper and lower wall faults, there are obvious displacement barriers. With the same size of ore house, the displacement decreases with the increase of pillar size. When the room size is larger than a certain value, the mining of ore body will have an impact on the surface, and there are certain safety risks.