开采扰动作用下寒区矿山边坡稳定性研究

Study on slope stability under mining disturbance in cold area

高海拔高寒矿山采场边坡除了会受到冻融循环作用以外,还会长期受到爆破开采、大型机械施工运行等的扰动影响,造成边坡稳定性的破坏。通过多年来国内外对矿山边坡稳定性研究工作的总结,分析了两点研究内容的不足:大部分研究针对常温常压下的常规边坡,对高海拔低压寒区边坡稳定性的研究较少;对开采扰动作用下的边坡稳定性研究不完整。以新疆和静县备战铁矿东帮边坡为工程背景,在已有的边坡稳定性研究基础上,创新地引入影响寒区边坡稳定性的冻融因子。运用层次分析法,归纳、总结影响边坡稳定性的12个因素及其权重,再运用模糊综合评判法计算得出寒区边坡稳定性相应的等级。最总计算结果表明:根据模糊综合评判中的最大隶属度原则,目标层矩阵B中的最大值为0.64,与其对应的寒区边坡稳定性等级是Ⅲ级。

In addition to the freezing and thawing cycle,the slope in the high-altitude alpine mine will be affected by long-term disturbance caused by blasting mining and large-scale machinery construction and operation,resulting in the failure of slope stability.Through the summary of a great deal of researches on the of mine slope stability at home and abroad,this paper analyzes two shortcomings of the previous researches.One is that most of the researches focus on the normal slope at normal temperature and pressure,there are few studies on the slope stability in low pressure cold region with high altitude.Another is that the study of slope stability under mining disturbance is incomplete.So,this paper based on the engineering background of the east slope of Beizhan iron mine in Hejing county,Xinjiang province,based on the existing slope stability research,the freezing and thawing factors affecting the stability of the slope in the cold region were innovatively introduced.By using analytic hierarchy process(AHP),the 12 factors affecting slope stability and their weight are summarized,and then the corresponding grade of slope stability in cold region is calculated by using fuzzy comprehensive evaluation method.The calculation results show that according to the principle of maximum membership degree in fuzzy comprehensive evaluation,the maximum value of target layer matrix B is 0.64,the corresponding stability level of cold slope is level Ⅲ.