爆破作用下露天矿边坡动态稳定性  

Dynamic Stability of Open Pit Slope Under Blast Loading

作　　者：杨宇江[1] 李艳[2] 刘建坡[1] 徐帅[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省交通高等专科学校,辽宁沈阳110122

出　　处：《东北大学学报（自然科学版）》2011年第10期1472-1475,共4页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2008BAB34B02);中央高校基本科研业务费专项资金资助项目(90401006);国家自然科学基金资助项目(50974031);教育部新世纪优秀人才支持计划项目(NCET-10-0275);教育部青年教师科研启动基金资助项目(N090301002)

摘　　要：以归来庄深凹露天金矿为工程实例,采用FLAC和强度折减法,得出边坡在静力条件下的安全系数.针对不同折减系数下的边坡计算方案,在坑底施加爆破动载荷.将加卸载响应比理论引入边坡动力稳定分析研究中,建立边坡在爆破作用下的加卸载响应模型.以爆破振动速度的周期性变化作为加载量,以边坡特征点的相应速率作为响应参数,进而确定在爆破载荷作用期间的边坡加卸载响应比.计算结果表明:在爆破载荷作用后,不同的边坡稳定状态表现出不同的加卸载响应比特征;在边坡失稳前,加卸载响应比呈现持续增长的特点,说明以加卸载响应比作为爆破边坡稳定性的判断依据是可行的.Based on the conditions of deep open pit of Guilaizhuang gold mine,the static safety factors of open pit slope were obtained by the FLAC software according to the principle of the strength reduction method.The explosive loading was imposed on the open pit bottom to analyze the dynamic stability of the slope under different reduction factor.The theory of load-unload response ratio（LURR） was introduced to establish a load-unload response model of slope under blast loading.The periodical variation of blasting vibration velocity was regarded as loading parameter,and the velocity of characteristic point was regarded as response parameter to determine the LURR of slope under blasting loading.It was found that the LURR under blast loading can reflect the different slope stability state,and the LURR increases gradually as the slope approaching instability.Therefore,LURR is regarded as a very effective nonlinear dynamic analysis method to judge slope stability.

关 键 词：爆破振动 露天矿边坡 加卸载响应比 数值模拟 安全系数 

分 类 号：TD323[矿业工程—矿井建设]