东升庙矿9号矿柱回收采空区围岩稳定性分析

以东升庙矿2＃和11＃矿床矿柱回收及空区处理项目为基石展开,目的是想在空区处理研究领域形成一套相对完善的空区处理关键性技术模式,通过开展东矿现场和室内试验研究,采用FLAC3D 4.0新版本数值模拟软件对空区围岩稳定性进行模拟分析,结合极限自然平衡拱理论对空区围岩可能冒落的范围进行预测,以便有效地控制地压,预防空区顶板围岩突然冒落造成矿山重大安全事故。我们对900 m中段以上9号矿柱回收过程进行了详尽的模拟研究,在9号矿柱回收过程中,空区上盘围岩的主要破坏形式主要为拉应力及剪应力超过屈服极限引发的塑性破坏,塑性破坏区域主要分布在空区上、下盘围岩隅角及32号矿柱上覆岩层内的部分区域。

Stability Analysis on Recovery Goaf Surrounding Rock of the Pillar-9 in Dongshengmiao Mine

This topic is based on the project of Pillar recovery and goaf processing at Dongshengmiao mine#2 and #11 ore deposit, with the purpose that in the goaf processing field to form a relatively perfect key technical model for empty area processing, by means of the treatment of goaf and the indoor test, using the new version of FLAC3D 4.0 numerical simulation software to simulate and analyse the stability of surrounding rock after goaf processing, combined with the natural equilibrium arch theory to forecast scope of the surrounding rock of goaf which may inbreak, so as to effectively control groud pressure and to prevent the roof rock burst which may cause a major accident. We mainly study the Pillar-9 recovery process at above the midpiece of 900 m, in Pillar-9 recovery process, the major damage form of the surrounding rocks of the goafs` upper plate was plastic damage due to that the tensile stress and shear stress exceeded the yield limit, the plastic damage area was mainly distributed in the surrounding areas of the plate under angle, footwall upper corner of surrounding rock and in the Pillar-32 position within the area of the strata.