露天矿山典型高陡边坡稳定性分析  

Stability analysis of typical high and steep slopes in open-pit mines

作　　者：韩浩亮 HAN Haoliang(Information Institute of Ministry of Emergency Management,Beijing 100029,China)

机构地区：[1]应急管理部信息研究院,北京100029

出　　处：《矿冶》2024年第3期347-355,共9页Mining And Metallurgy

基　　金：国家重点研发计划项目(2021YFC3001300)。

摘　　要：随着我国采矿业的不断发展,安全生产变得尤为重要。特别是在露天矿山中,边坡稳定是制约矿山安全生产的重要因素,合理确定边坡稳定性安全系数是保证露天矿山安全生产的关键。以粤港澳大湾区某花岗岩矿为例,为了有效评估边坡的稳定性,并为矿山的安全生产提供科学依据,根据边坡工程地质分区情况,每个分区选取一处典型剖面,共选取4个高陡边坡典型剖面,对矿区整体进行边坡稳定性分析。首先在现场钻孔取样,并将样品加工成标准试件,开展物理力学与现场原位土工试验,确定岩土体的内摩擦角、黏聚力、重度等基本物理力学参数,随后使用赤平投影法对典型剖面节理分布进行统计描述,并对边坡破坏模式进行定性分析,最后采用Bishop法和Morgenstern-Price法对边坡二维剖面进行极限平衡法安全系数计算。结果表明,4个典型设计境界剖面在3种工况下的整体边坡安全系数均符合规范要求值。为了进一步验证边坡稳定性,选用FLAC3D软件,采取强度折减法对三维边坡模型的稳定性进行研究,更直观地反映边坡的应力分布和边坡极限位移量,有效地对边坡稳定性进行了分析,为矿山的安全生产提供重要参考,并针对矿山实际提出了一系列保障边坡安全稳定的工程措施。研究成果对矿山的安全生产具有重要指导意义,也为类似矿山的安全生产提供了有益借鉴。As the mining industry in China continues to develop,safety in production has become increasingly crucial.Particularly in open-pit mines,slope stability is a significant factor constraining the safety of mining operations.The rational determination of the safety factor for slope stability is essential to ensure the safe production of open-pit mines.Taking a granite mine in the Guangdong-Hong Kong-Macao Greater Bay Area as an example,this study aims to effectively assess slope stability and provide a scientific basis for safe mining operations.Four typical high and steep slopes were selected based on the regional division of engineering slope geology.First,on-site drilling and sampling were conducted,and the samples were processed into standard specimens for conducting physical and in-situ geotechnical tests to determine the basic physical parameters of the rock-soil mass,such as internal friction angle,cohesion,and unit weight.Subsequently,the joint distribution of the typical cross-sections was statistically described using stereographic projection,the failure modes of the slopes were qualitatively analyzed,and finally,the Bishop method and the Morgenstern-Price method were employed to calculate the safety factor of the two-dimensional slope profiles using the limit equilibrium method.The results indicate that the overall safety factors of the four typical design boundary profiles under three different conditions meet the specified requirements.The FLAC3D software was used to study the stability of a three-dimensional slope model using the strength reduction method to verify the slope stability.This approach more intuitively reflects the stress distribution and the ultimate displacement of the slope,effectively analyzing the slope stability and providing important references for safe mining operations.A series of engineering measures to ensure the safety and stability of the slopes were proposed based on the actual conditions of the mine.The research findings provide significant guidance for safe mining operatio

关 键 词：露天矿山 边坡稳定性 赤平投影法 BISHOP法 Morgenstern-Price法 强度折减法 FLAC3D 

分 类 号：TD804[矿业工程—矿山开采]