【作者】 姚银佩；

【导师】 李夕兵；

【作者基本信息】 中南大学 ， 采矿工程， 2011， 硕士

【摘要】 山东黄金新城金矿深部V#矿体为一厚大破碎缓倾斜矿体,-580m中段矿块划分一步矿房和二步矿房开采,其中一步矿房宽8m,采用机械化盘区上向水平分层充填采矿法,开采即将结束。因矿体埋藏深,应力大,上盘为焦家断层带,二步矿房两侧为一步采场充填体,且一步充填水对二步矿岩侵蚀破坏,致使二步矿房矿岩异常破碎,二步矿房的开采安全性受到了严重的考验。经过分析研究,拟对二步矿房采用预控顶中深孔落矿嗣后充填采矿法开采。为了安全回采二步矿房,有必要对二步矿房进行一步采场充填体自立性效果和二步采场顶板稳固性等为主的采场稳定性影响因素进行分析。为此,本论文主要开展如下研究：1.通过现场工程地质调查和岩石力学取样,得到深部矿体的岩体力学参数,并对岩体进行工程质量分级；2.根据一步采场充填体受力模型,分析充填体内部应力,充填体自立所需的强度；3.计算一步采场充填体自立高度,研究分析当二步矿房采用中深孔开采高度达到一个分段高时,一步矿房胶结充填体的自立性；4.利用岩土有限元软件Midas/GTS对新城金矿二步矿房开采进行数值模拟计算,探讨按不同分段高度和不同采场开挖长度,对采场顶板稳定性的影响,并与试验采场监测进行比较验证。更多还原

【Abstract】 The deep V# orebody of Xincheng Gold Mine in Shandong province is a gently inclined large broken orebody. In-580m level of the orebody extraction is divided into two steps mining. First-step room with 8 meters wide is mined by mechanized panel upward horizontal slice cut-and-fill method, because of deep burial depth, high crustal stress, Jiaojia Fault Zone in the roofs, and the orebody of second-step pillar is extremely broken and unstable. On the other hand filling water from the backfilling in first-step room deteriorates both sides of second-step pillars. The mining safety of second-step pillars mining is seriously challenged. In order to extract second-step stope safety and efficiently, mining method called medium-length hole blasting extraction by pre-controlling roof and first-step filling is put forward. In order to gurantee the safety of mining second-step pillars, it is essential to perform the stability analysis on free-standing of backfill in first-step rooms and the roof stability of second-step pillars. Major works in this paper are listed as follows:1. Investigating mechanical parameters of rock mass at great depth are and classifying rock mass quality is carried out according to the obtained parameters.by field investigations of engineering geological conditions and rock mechanical sampling experiments.2. Analysis internal stress and required strength of free-standing backfill based on the mechanical model of backfill in first-step rooms.3. Calculating the height of free-standing backfill in first-step rooms related formulas. And discussing the free-standing cemented backfill in first-step rooms, as the height of medium-length hole blasting is designed as a sublevel height in current second-step pillars of Xincheng Gold Mine.4. Numerically simulating according to the effect of different sublevel heights and excavation lengths on roof stability of second-step rooms by using geotechnical finite element software Midas/GTS. After that, comparing with field measurement results in the testing stope.更多还原