累积爆破作用下露天矿山边坡稳定性变化研究  

Study of open-pit mining slope stability under multiple blasting action

作　　者：叶宗昂 谢建斌 李志源 唐未旭 杨海涛 彭一泰 YE Zong'ang;XIE Jianbin;LI Zhiyuan;TANG Weixu;YANG Haitao;PENG Yitai(Yunnan University,School of Architecture and Planning,Kunming Yunnan 650500,China)

机构地区：[1]云南大学建筑与规划学院,云南昆明650500 [2]昆明军龙岩土工程有限公司,云南昆明650214

出　　处：《工业安全与环保》2024年第10期31-35,54,共6页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(11862024)。

摘　　要：为研究多次开挖爆破作用对露天矿山边坡岩体的累计损伤及其对边坡稳定性的影响,提高生产的安全性,根据岩石室内物理力学试验结果,基于颗粒流离散元方法(PFC)和有限元分析软件MidasGTS,模拟研究了边坡岩体在多次爆破荷载作用下的累计损伤,探明了边坡岩体抗剪强度随岩体累计损伤的变化规律,建立典型露天矿山边坡岩体模型,研究了多次爆破荷载作用下边坡安全系数的变化情况。结果表明,随爆破次数的增加,边坡岩体的裂隙增多,岩体受扰动程度增大,爆破动荷载对边坡岩体的累计损伤效应持续增强;边坡岩体抗剪强度随岩体损伤的累积呈类似指数型下降;每次爆破动荷载作用使边坡安全系数降低16.2%~30.3%,8次爆破累积损伤作用使边坡安全系数降低约40.8%。In order to study the cumulative damage of multiple blasting excavations on the rock mass of open-pit mine slopes and its impact on slope stability to improve production safety,according to laboratory experimental results,bas ed on the method of particle flow code(PFC)and finite element analysis software Midas GTS,simulated and studied the cumulative damage of slope rock mass under multiple blasting loads.Established the variation law of shear strength parameters of the slope mass with cumulative damage of rock mass.A typical open-pit mine slope model was estab lished using the finite element analysis software.Researched how the slope safety factor changed when subjected to multiple blasting loads.The results show that with the increased of blasting,the rock mass cracks and the disturbance degree increased.The cumulative damage effect of blasting load on rock mass continues to develop with the blasting.The shear strength parameters of slope rock mass decreases exponentially with the accumulation of damage.Each blas ting load leads to a reduction in the slope's safety factor by a range of 16.2%-30.3%,and the slope safety factor is re duced by 40.8%under the cumulative damage caused by eight blasting.

关 键 词：边坡稳定性 多次爆破 累积损伤 数值模拟 安全系数 

分 类 号：TD854.6[矿业工程—金属矿开采]