摘要
露天矿山边坡稳定性对矿山安全生产至关重要,因此需对其作出准确评价。以川西南地区某露天砂岩矿山边坡为研究背景,通过实地取样和室内三轴压缩试验获得岩石物理力学参数,基于Bishop法和正态分布3σ原则建立计算模型,并对边坡安全系数进行了敏感性分析,结果表明,边坡安全系数对黏聚力最敏感,其次是内摩擦角,对容重最不敏感;利用模型计算得到了边坡在正常、暴雨及地震工况下的失效概率与可靠性指数,据此对边坡稳定性进行了评价,结果表明:正常工况和暴雨工况下边坡的失效概率分别为1.3%、4.5%,边坡失稳概率较低;地震工况下的失效概率达到了12.3%,边坡失稳概率较高,应采取有效的减震措施,尽量降低施工和生产对边坡稳定性的不利影响。
The slope stability of open-pit mine slope plays an important role in safety mine production.Therefore accurate assessment on the slope stability is needed.Taking the slope of the open-pit sandstone mine in Southwest Sichuan as the reference for study,sampling was undertaken on site,thus indoor triaxial compression tests on the sample were carried out to obtain the mechanical parameters of the rock.The computing model was established based on the 3σprinciple of normal distribution using Bishop process.The results of susceptibility analysis on slope safety factor indicated that the slope safety factor was most sensitive to the cohesion,secondary sensitive to the internal friction angle and least sensitive to the bulk density.The failure probability and reliability index of the slope under normal,rainstorm and earthquake conditions were calculated by computaional model,hereby the slope stability can be assessed accordingly.The results show that the failure probability of slope under normal and rainstorm condition was low at 1.3%and 4.5%respectively,while the failure probability under earthquake condition was high at 12.3%.Effective damping measures should be taken to minimize the influence of construction and production on the slope stability.
作者
李佳伦
张志贵
李斌
王鹏
贾子征
Li Jialun;Zhang Zhigui;Li Bin;Wang Peng;Jia Zizheng(School of Environment and Resources,Southwest University of Science and Technology,Mianyang Sichuan 621010,China)
出处
《化工矿物与加工》
CAS
2022年第9期15-18,23,共5页
Industrial Minerals & Processing
基金
国家自然科学基金(51904248)。
关键词
边坡稳定性
概率分析
3σ原则
失效概率
敏感性
可靠性
露天矿山
slope stability
probability analysis
3σprinciple
failure probability
susceptibility
reliability
open-pit mine
