缓倾斜中厚磷矿床矿柱稳定性及采场结构优化  

Stability of the Pillar and Stope Structure of Optimization of Gently Inclined and Medium Thick Phosphate Rock

作　　者：李小双[1,2] 李耀基[1,2] 王孟来[1,2] 朱建新[3] 

机构地区：[1]国家磷资源开发利用工程技术研究中心,云南晋宁650600 [2]云南磷化集团有限公司,云南晋宁650600 [3]中煤国际工程集团沈阳设计研究院有限公司,辽宁沈阳110015

出　　处：《金属矿山》2015年第5期44-47,共4页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2011BAB08B01;2013BAB07B06);云南省科技领军人才计划项目(编号:2014HA014)

摘　　要：以云南磷化集团晋宁磷矿6号坑口东采区+2 150 m水平缓倾斜中厚磷矿床为研究对象,通过矿山压力平面应力相似模拟试验台,进行了房柱采矿法下矿柱稳定性及采场结构参数优化的相似模拟试验。基于试验结果,研究了沿矿体走向推进过程中采场顶板围岩与矿柱的应力、变形破断规律,同时对采场矿柱宏观失稳破坏模式和失稳机理进行了探讨分析,并对房柱法开采下采场结构参数进行了优化。结果表明:房柱法开采下采场围岩的变形破断具有明显的3个阶段特征,按照变形破坏程度,房柱法开采后,采场覆岩划分为垮落带、裂隙贯通带以及微裂隙松动带;矿体开挖结束后,对采场的个别矿柱进行回收,回采结束后矿柱会突然发生整体大规模的垮塌失稳破坏,呈现出明显的"多米诺骨牌效应";同时建议采用矿房10 m,矿柱8 m的采场结构参数,以保证采矿安全。研究结果可为该采区深部矿体或类似条件的矿山开采提供理论和技术上的指导和建议。Based on the gently inclined medium thick phosphate deposit at the east mining section of ＋2 150 m level ofJinning No. 6 mine under Yunnan phosphate Co. , Ltd. , the similar simulation experiment of the stability of stopes pillars underroom and pillar mining was carried out by the similarity simulation of mine pressure plane stress modeling. Based on the experi-mental results, the stress changing law of the above roof of stope pillar during the mining along the strike direction of phosphatewere investigated. The macroscopic instability and failure model and instability mechanism were also studied. Then, the stopestructural parameters under the room and pillar mining method are optimized. The experimental results showed The deformationand breaking features of stope wall rock under room and pillar mining method has obvious three phase characteristics. The over-burden rocks are divided i.to caving belt,fissure zone, micro cracks loose belt according to the deformation level. After the orebody excavation finished, individual pillars are recovered. After that, the whole instability and large-scale failure of mining pillarmay suddenly occur,called obviously domino effect phenomenon. At the same time, the stope structural parameters of 10 mroom and 8 m pillar are recommended so as to ensure the mining safety. The relevant research can provide theoretical and tech-nical guidance for the underground mining of the deep ore body or similar mines.

关 键 词：缓倾斜中厚磷矿床 矿柱稳定性 房柱法 相似模拟 采场结构 优化 

分 类 号：TU459[建筑科学—岩土工程]