融合Bishop算法和FLAC^(3D)的露天矿边坡安全系数敏感性分析  

Sensitivity Analysis of Open-pit Mine Slope Safety Factor Based on Bishop Algorithm and FLAC^(3D)

作　　者：徐晓东[1] 杜文秀[1] XU Xiaodong;DU Wenxiu(Barun Mining Branch,Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014000,China)

机构地区：[1]内蒙古包钢钢联股份有限公司巴润矿业分公司,内蒙古包头014000

出　　处：《金属矿山》2023年第6期200-206,共7页Metal Mine

摘　　要：为研究岩体力学参数和边坡自然条件对边坡稳定性的影响,以白云鄂博西矿为例,通过现场实测、理论推导和数值模拟,提出了一种融合Bishop算法和FLAC^(3D)的露天矿边坡安全系数敏感性分析方法,研究了地下水位、边坡高度、边坡角度、岩体黏聚力和内摩擦角对露天矿山边坡安全系数的敏感程度和边坡的运移规律。结果表明:①边坡安全系数对地下水位变化较为敏感,当地下水位低于200 m时,水位每上升50 m,边坡的安全系数将降低10%,而当水位高于200 m时,安全系数随水位升高而降低的幅度越来越小;②当坡高相同时,随着坡面角增大,边坡安全系数逐渐减小,边坡稳定性变差,边坡安全系数对边坡角和岩体的内摩擦角更为敏感;③边坡主要运动形式是在自重应力作用下引起的压缩沉降,数值模拟计算的边坡安全系数与理论计算值的误差为6.08%~9.11%,误差在合理范围内,反映出理论分析与数值模拟结果的有效性。所提方法对于矿山边坡稳定性分析具有一定的参考意义。In order to study the influence of rock mass mechanical parameters and slope natural conditions on slope stability,a sensitivity analysis method of open-pit mine slope safety factor combining Bishop algorithm and FLAC^(3D) was proposed based on field measurement,theoretical derivation and numerical simulation in Bayan Obo Mine.The sensitivity of underground water level,slope height,slope angle,rock cohesive force and internal friction angle to the safety factor of open-pit mine slope and the migration rule of slope are studied.The results show that:①The safety coefficient of slope is sensitive to the change of groundwater level.When the groundwater level is lower than 200 m,the safety coefficient of slope will decrease by 10%for every 50 m rise of water level,but when the water level is higher than 200 m,the safety coefficient decreases with the increase of water level.②When the slope height is the same,the slope safety coefficient decreases gradually with the increase of slope angle,and the slope stability becomes worse.The slope safety coefficient is more sensitive to the slope angle and the internal friction angle of rock mass.③The main motion form of slope is compressive settlement under the action of self-weight stress.The error of the slope safety coefficient calculated by numerical simulation and theoretical calculation is 6.08%~9.11%,which is within a reasonable range,indicating the effectiveness of theoretical analysis and numerical simulation results.The proposed method has certain reference significance for the stability analysis of mine slope.

关 键 词：露天矿山 边坡稳定性 敏感性分析 安全系数 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]