透镜体影响尾矿坝安全性的规律及其简化方法

来源期刊:中南大学学报(自然科学版)2017年第5期

论文作者:李志平 彭振斌 何忠明 袁维

文章页码:1326 - 1335

关键词:尾矿坝;透镜体;主成分分析法;判别分析法;稳定性分析

Key words:tailing dam; lenticles; principal component analysis; discriminant analysis; stability analysis

摘    要:对透镜体的参数敏感性进行分析,并提出一种透镜体简化分析方法,提高数值建模的效率。首先,将浸润线深度、坝顶位移和安全系数作为坝体安全的评价指标,把透镜体的大小、长短轴比、水平位置、垂直位置、黏结力和摩擦因数作为透镜体影响坝体的影响因子,通过正交试验设计方法探讨该6个影响因子对坝体安全的影响规律,然后,定义影响系数评价6个影响因子对安全性的影响程度,并通过主成分分析法和判别分析法建立透镜体简化的准则,并以此作为判据来决定各个透镜体是否从模型中忽略。研究结果表明:该简化方法在流程上可操作性强,所计算的安全系数具有一定的可靠性。

Abstract: Based on the method of orthogonal test design, the sensitivity analysis of parameters of the lenticle was performed and a simplification method for lenticles was proposed to increase the efficiency of numerical modeling. Firstly, the depth of seepage line, the displacement of dam crest and the safety factor were considered as the evaluation indexes and the size, horizontal and vertical position, the ratio of major axis minor axis, cohesion and friction of lenticles were treated as impact factors, and the influence of these six impact factors on the safety of tailing dam was discussed through orthogonal experiment design method. An impact coefficient was defined to evaluate the impact degree of six impact factors to the safety of tailing dam, and the judge criterion was established through the combination of the principal component analysis and discriminant analysis. Based on this judge criterion, it was determined whether the lenticle is to be removed from the numerical model. The results show that the simplified method has strong operability in the process, and the calculated safety factor has certain reliability.

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