摘要
在金属矿山开展两步骤嗣后充填回采过程中,围岩应力平衡状态多次重新分布,易诱发岩体失稳破坏等地压显现问题,为矿山安全高效开采带来巨大的安全隐患。以某铜镍矿急倾斜厚大矿体为研究对象,通过开展岩体结构面现场调查,对矿山各中段围岩赋存特征与典型工程地质岩组的岩体质量情况进行有效探查与分级评价;采用数值分析方法,构建矿山三维工程地质模型,获得了各中段两步骤嗣后充填回采过程的应力场、位移场分布规律与塑性破坏特征。依据矿山开采现状及现有研究成果,开展采场稳定性评价,实现对矿山地压显现区域的准确识别。研究结果表明:矿山各中段围岩主要发育为3组优势节理,发育程度为中等-密集;3种典型地质岩组的岩体质量Q平均值分别为3.95、8.03、6.81,且随埋深增加整体呈下降趋势。同时,受开采扰动影响,各中段采场的应力、位移与塑性破坏区域的分布规律基本相同,且二步骤回采的地压活动特征比一步骤更加显著。针对两步骤嗣后充填回采采场围岩稳定性控制难题,将研究成果与现场实际相结合,实现了对采场稳定状态的精准识别与评价。研究成果对于矿山围岩风险判别与地压管控具有重要的指导意义。
The stress equilibrium state of the surrounding rock is repeatedly redistributed during the process of two-step subsequent filling mining in metal mines,resulting in potential ground pressure issues such as rock instability and failure.These challenges present significant safety risks for efficient and secure mining operations.Effective investigation and classification of the occurrence characteristics of surrounding rock in the middle section of the mine,as well as assessment of rock mass quality for typical engineering geological rock groups,are conducted through focused research on a large-steeply ore body within a copper-nickel mine.By employing numerical analysis methods,this paper developes a 3D engineering geological model that allows to analyze stress field distribution patterns,displacement fields,as well as plastic failure characteristics during subsequent filling mining processes.Based on the current mining situation and existing research results,a stope stability evaluation is conducted to accurately identify the display area of mine ground pressure.The findings indicate that the surrounding rock in the middle section of the mine primarily exhibits three dominant joint groups with a medium to dense development degree.The average mass Q for these three typical geological rock groups are determined as 3.95,8.03,and 6.81 respectively,showing an overall decreasing trend with increasing burial depth.Additionally,under the influence of mining disturbance,the distribution patterns of stress,displacement,and plastic failure areas in each stope within the middle section are essentially identical;however,ground pressure activity characteristics are more pronounced in two-step mining compared to first-step mining.By combining these research results with field practice,accurate identification and evaluation of stope stability can be achieved for addressing stability control issues in two-step subsequent filling mining operations.These research findings have significant guiding implications for risk identification
作者
曹聪
秦秀山
于世波
王虎强
曹雪伟
CAO Cong;QIN Xiushan;YU Shibo;WANG Huqiang;CAO Xuewei(BGRIMM Technology Group Co.,Ltd.,Beijing 102628,China;Hami Hexin Mining Co.,Ltd.,Hami 839000,China)
出处
《中国矿业》
北大核心
2024年第S01期297-303,共7页
China Mining Magazine
基金
国家重点研发计划项目资助(编号:2022YFC2903804)
关键词
两步骤嗣后充填
地压分布
采场稳定性
数值模拟
金属矿山
two-step subsequent filling mining
ground pressure distribution
stope stability
numerical simulation
metal mine
