黄金科学技术 ›› 2018, Vol. 26 ›› Issue (4): 503-510.doi: 10.11872/j.issn.1005-2518.2018.04.503
Jianhua HU1(),Qifan REN1,Zhonghua QI2,Jiwei ZHANG2
摘要:
地下矿山开采中,合理的采场暴露面积是保障采矿作业安全的前提,采场暴露面积作为地下采场的主要结构参数需要进行优化。以卧虎山矿27-31线为研究对象,运用3DMine-Midas- Flac3D耦合建模技术,构建了地表、矿体和采场的精细化模型,在采场长度参数为30 m和40 m的条件下,设计了10种采场暴露面积计算方案,通过数值模拟获得采场顶板最大拉应力和两帮最大压应力,基于此建立了采场暴露面积与顶板最大拉应力及两帮最大压应力的回归优化模型,在有安全系数的保障下确定了采场极限暴露面积。研究结果表明:(1)经采场稳定分析,最大压应力主要出现在采场两帮的围岩,而最大拉应力出现在顶底板;(2)通过建立采场暴露面积与最大拉应力和最大压应力的回归函数关系曲线,获得暴露面积与应力的关系规律,即在相同采场暴露面积条件下,采场越长则拉应力越小,而在相同拉压应力限值情况下,采场越长则极限暴露面积越大;(3)以矿山生产安全系数1.3为基数,通过回归函数曲线规律,根据采场矿体的赋存条件,以30 m和40 m的采场长度值,确定卧虎山矿的极限暴露面积分别为450 m2和600 m2。当岩体力学参数改变时,亦可采用回归函数曲线规律自适应判定采场极限暴露面积和采场跨度。
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