单侧揭露后侧受压胶结充填体稳定性分析

Analysis of the Stability of the Cemented Backfill with Unilateral Exposure and Posterior Compression

为了研究阶段空场嗣后充填采矿法中单侧揭露后侧受压状态下胶结充填体的稳定性,根据胶结充填体、围岩和非胶结充填体三者之间力学作用关系,建立了更加符合现场实际的胶结充填体在单侧揭露后侧受压状态下三维力学模型,并同经典解析法计算结果进行比较。研究结果表明:在设计单侧揭露后侧受压胶结充填体强度时,采用自立性人工矿柱模型是不足的,应当考虑后侧非胶结体受压作用、自身尺寸、充填体与围岩之间有效摩擦力和顶部外荷载等因素。

In order to study the stability of cemented backfill under the condition of unilateral exposing and the posterior compressive state in stage open stope method with subsequent filling,and according to the mechanical interaction among the cemented backfill,the surrounding rock and the non-cemented backfill,the more practical three-dimensional mechanical model of the cemented backfill in the state of unilateral exposure and posterior compression is established and compared with the classical analytic method. The results show that it is insufficient to use the self-supporting human mining pillar model in the design of strength of cemented backfill with single side exposing and the posterior compression. It should consider such factors as the compressive action,the size of the backfill side,the effective friction force between the backfill body and the surrounding rock,and the top external load.