露天金矿边坡稳态数值分析及开采深度优化  

Slope Stability Numerical Analysis and Mining Depth Optimization of Open-pit Gold Mine

作　　者：陶志刚[1,2] 张慧[1,2] 成乐 杨晓杰 史广诚[1,2] TAO Zhigang;ZHANG Hui;CHENG Le;YANG Xiaojie;SHI Guangcheng(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《金属矿山》2023年第5期104-112,共9页Metal Mine

基　　金：国家自然科学基金面上项目(编号:52074295);越崎学者专项资金项目(编号:800015Z11A07);中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金项目(编号:SKLGDUEK202217)。

摘　　要：随着矿山开采深度不断加大,对于安全开采深度的研究愈发重要。当前主要通过极限平衡法对边坡稳定性进行分析,针对精确分析结构面的稳定性状态研究较少。针对长山壕金矿东北采场开采现状,通过现场工程地质条件及岩体完整性调查,对边坡倾倒失稳破坏特征进行了详细分析。运用3DMine软件并根据现场工程地质调查数据及历史钻孔编录数据建立了矿区东北采场的复杂三维整体模型,对当前开采设计条件下的边坡最终状态模型的稳定性进行了分析。基于非连续变形分析(Discontinuous Deformation Analysis,DDA)法建立了采场北帮5个剖面模型,对该模型当前开采状态和不同开挖深度下的边坡稳定性进行了分析。结果表明:东北采场地质构造复杂,节理裂隙发育,岩体极破碎,是北帮边坡发生变形破坏的关键因素;当前开采设计方案在开挖施工过程中会造成边坡失稳破坏;通过DDA模型分析,验证了实际推测的破坏情况,模拟出了不同开挖深度工况下的稳定性情况,在坑底距离最终设计境界84 m时出现临界深度,为露天矿山开采设计提供了相关借鉴。With the increasing depth of mining,the study of safe mining depth has become more and more important.At present,the slope stability is mainly analyzed by limit equilibrium method,and the stability state of the structural surface is less studied for precise analysis.In view of the current mining situation in the northeast quarry of Changshanhao Gold Mine,through the investigation of engineering geological conditions and rock integrity,the detailed analysis of the damage characteristics of overturning instability of the slope was done.Based on the data of engineering geological investigation and historical borehole logging data,the complex three-dimensional overall model of the northeast quarry of the mine was established by using 3DMine software,and the stability of the final state model of the slope under the current mining design conditions was analyzed.Based on discontinuous deformation analysis(DDA)method,five profiles of the north gang of the quarry were established,and the stability of the slope under the current mining condition and different excavation depths was analyzed.The results show that the complex geological structure of the northeast quarry,the development of joints and fissures,and the extreme fragmentation of the rock body are the key factors for the deformation and damage of the north slope.The current mining design plan will cause the slope destabilization and damage during the excavation and construction process.The analysis of the DDA model verifies the actual speculative damage and simulates the stability under different excavation depth conditions,and the critical depth occurs when the bottom of the pit is 84 m away from the final design boundary,which provides relevant reference for the design of open-pit mining.

关 键 词：边坡工程 3DMine建模 稳定性分析 安全开采深度 非连续变形分析 

分 类 号：TD854[矿业工程—金属矿开采]