摘要
降雨强度、初始饱和度、压实系数和张裂缝位置皆为尾粉砂干堆尾矿坝安全性的主要影响因素,其影响主要体现在安全系数、浸润线高度和某断面上潜在滑动面深度。为了探究各影响因素对尾矿坝安全性的敏感性,以某尾粉砂干堆尾矿坝为例,采用正交试验设计和数值模拟相结合的方法及熵权决策法,对4个主要影响因素进行敏感性分析。结果表明:尾粉砂干堆体在降雨条件下只产生表面滑动,不会发生整体性滑坡;不同指标下的最优最劣组合方案不完全相同,但经过熵权决策法综合分析,发现初始饱和度(S)的影响程度最大,且安全系数指标是最佳评价指标;在评价尾粉砂干堆体安全性时,采用3个指标进行多角度综合分析,可得到更精确的结果。
This article is aimed to introduce the safety of the dry silt tailings dam and the way for analyzing the sensitivity of the main factors. As a matter of fact, the so-called dry tailings dam refers to a new method of disposing of the mining tailings. Actual- ly, there exist a lot of essential factors that may account for the effect or impact of the dry railings dam on the safety for mining activities. Therefore, we have chosen oar topic of study in hoping to explore the chief factors that should account for the safety of the dry railings dams, such as the rainfall intensity, the soil initial saturation, the coefficient of compaction and location of the ten- sion cracks and some others. In each factor, there are three levels which stand for different influences on the safety of. the dam, whereas the factors mainly that may influence the safety factor may include the height of the saturation line and the depth of the potential sliding surface. The three indicators can reflect the safe- ty of the dry tailings dam in different aspects. Besides, when we choose the main factors that may influence a dry tailings dam, we have to use the orthogonal method for experimentation, which is expected to help to pick up the factors which are the most sensi- tive to the safety of the said tailings dam. Therefore, to get the accurate results, we do believe that it is essential to do numerical simulations of the dry tailings dam with the help of the MIDAS/ GTS software. At the same time, it is necessary for us to use the entropy weight decision-making method to make comprehensive a- nalysis of all the factors involved with the sensitivity analysis of the four main factors going first. And, finally, the results of our investigation and analysis prove that the depth of the potential sliding surface should be laid out at about 3 -4 m high, with the dry pile under the rainfall conditions only producing the surface slip, so as to get rid of overall landslide. On the other hand, it should never ignore the likely impact the rainfall is like
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第3期6-10,共5页
Journal of Safety and Environment
关键词
安全工程
影响因素
干堆尾矿坝
敏感性分析
正交试验
熵权决策法
safety engineering
effect factors
dry tailings dam
sensitivity analysis
orthogonal experiments
entropy weight decision-making method
