基于DEMATEL-SEWM云模型的露天矿爆破效果评价方法及应用

Evaluation Method and Application of Open-pit Mine Blasting Effect based on Dematel-SeWM Cloud Model

为了更好处理爆破效果评价中语言模糊性和评价等级定量分析随机性,建立了基于DEMATEL-SEWM的露天矿爆破效果云模型评价方法。运用DEMATEL(决策实验室分析法)和SEWM(结构熵权法),计算爆破效果评价指标的权重系数,客观反映了指标之间相互关联和指标权重判断差异程度对指标权重的影响。利用云模型特征值E_(x)、E_(n)和H_(e),客观地描述了爆破效果评价过程中随机性和模糊性。考虑各类指标权重的影响,分析爆破效果综合隶属程度,依据最大隶属度原则确定露天矿爆破效果的评价等级,较好地实现爆破效果评价中定性概念模糊随机性的定量直观表征。运用该模型对某露天矿爆破效果进行了评价,结果表明:各个指标的混合权重分别为0.101、0.102、0.154、0.163、0.128、0.112、0.132、0.107,由权重的大小可知,炸药单耗、大块率和振动速度三个指标对爆破效果影响较大;炸药单耗的原因度为1.2961,其他指标的原因度均小于零,炸药单耗为原因要素,是改善爆破效果的关键要素;四次爆破效果的综合隶属度分别为0.358、0.339、0.360、0.469,评价等级均为较好以上,评价结果与实际情况相符,验证了该模型在爆破效果评价中的有效性与可行性。

In order to better deal with the fuzziness of language and randomness of quantitative analysis of evaluation grade in blasting effect evaluation,a cloud model evaluation method for open-pit mine blasting effect was established based on DEMATEL-SEWM.DEMATEL(Decision Laboratory Analysis Method)and SEWM(Structural Entropy Weight Method)are used to calculate the weight coefficient of blasting effect evaluation indexes,which objectively reflects the influence of the correlation among indexes and the difference degree of index weight judgment.The randomness and fuzziness of blasting effect evaluation are objectively described by using cloud model eigenvalues,such as Expected Value E_(x),Entropy、E_(n) and Excess Entropy H_(e).Considering the influence of various index weights,the comprehensive membership degree of blasting effect is analyzed and the evaluation grade of blasting effect of open-pit mine is determined according to the principle of maximum membership degree,so as to better realize the quantitative visual representation of fuzzy randomness of qualitative concept in blasting effect evaluation.The model was applied to evaluate the blasting effect of an open-pit mine,and the results showed that the mixed weights of each index are 0.101,0.102,0.154,0.163,0.128,0.112,0.132,0.107,respectively.According to the weight,it can be known that the powder factor,the big block percentage and the vibration velocity have a great influence on the blasting effect.The cause degree of the powder factor is 1.2961 and the cause degrees of other indicators are negative.Therefore,the powder factor is the reason element which is the key factor to improve the blasting effect.The comprehensive membership degrees of the four blasting effects are 0.358,0.339,0.360 and 0.469,respectively.Meanwhile,the evaluation grades of the four evaluation results are all above good,which are consistent with the actual situation and verified the effectiveness and feasibility of the model in blasting effect evaluation.