透镜体对尾矿坝安全性影响的参数敏感性分析

来源期刊:中南大学学报(自然科学版)2013年第3期

论文作者:袁维 白冰 李小春 汪海滨

文章页码:1174 - 1183

关键词:透镜体;敏感性分析;熵权决策法;正交试验设计法

Key words:lenticle; sensitivity analysis; entropy weight decision; orthogonal decision

摘    要:透镜体在坝体中的大小、位置、形状以及抗剪强度参数和变形参数皆为坝体安全性的影响因素,其影响主要体现在坝体的浸润线深度、坝顶位移和安全系数。本研究基于正交试验设计法和熵权决策法,对透镜体进行参数敏感性进行分析。研究结果表明:透镜体的垂直位置和面积比率是最关键的几何影响因素,而黏结力(c)和摩擦角(φ)则是最关键的材料影响因素;透镜体面积比率越小,坝体安全性高;透镜体处于坝体顶部和后缘时,坝体安全性越高;透镜体的c,φ以及渗透系数Ks与破坏比Rf越大,坝体安全性越高;在评价坝体稳定时,建议综合坝顶位移与安全系数2个指标对其进行稳定性分析。

Abstract: Lenticles impacting on tailings dam safety is always reflected in the depth of saturation line, the displacement of dam crest and the safety factor. The influencing factors consist of lenticles’ size, location, shape, parameters of shear strength and deformation, however, not all of these are critical factors. Based on the method of orthogonal test design and entropy weight decision, the sensitivity analysis of parameters of the lenticle was performed. It has been found that the vertical position and the area ratios of lenticles are the most significant geometric elements, and the cohesion and friction angle of lenticles are the most pivotal material factors. The smaller the ratio of lenticle is, the safer the dam is; meanwhile, the top and rear of dam are the better places for the safety of dam than other location. The larger the cohesion, friction angle, osmotic coefficient and break ratio of lenticle are, the securer the dam is. In addition, it is suggested that the displacement of dam crest and the safety factor should be all considered to evaluate the safety of dam.

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