分析作为尾矿库岩土工程安全要素的防护结构的稳定性

IF 2.8 Q2 MINING & MINERAL PROCESSING Mining of Mineral Deposits Pub Date : 2023-12-30 DOI:10.33271/mining17.04.116
Vasyl Tymoshchuk, Leonid M. Rudakov, D. Pikarenia, O. Orlinska, H. Hapich
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引用次数: 0

摘要

目的是评估土壤挡土墙的稳定性,以确保乌克兰卡米扬斯克镇放射性废物尾矿池关闭和进一步复垦(或修复)期间的岩土工程安全。方法。根据对特定尾矿库区域地质-水文地质、工程地质和岩土工程条件的分析,使用基于有限元方法的介质变形弹塑性模型,对保护结构的地质力学稳定性进行了评估。为此,根据先前的地球物理研究、勘探钻井和工程地质调查,考虑到坝坡的几何形状以及岩石材料特性垂直剖面的变化,对坝坡进行了细化。研究结果已在水力结构的典型区域内确定了尾矿库保护坝的稳定系数;在工业废水饱和的各种条件下,该系数对整个结构的健康状况具有很高的可靠性和代表性。根据定义,稳定系数从 ks = 1.372 到 4.758 不等。2022 年和 2016 年的指标对比显示,由于水饱和和地下水位上升,边坡稳定系数呈下降趋势。尽管如此,大坝结构的设计特点使得整个大坝长度上的稳定系数比标准值(即 ks = 1.250)高出 1.13 倍。独创性。尾矿库保护坝的稳定性取决于预测的地下水位上升时的供水量,并以大气和融水进入尾矿库为代价。放射性废水完全饱和的危险会显著降低保护结构的稳定系数,这一点可以通过预测模型数据得到证实。如果最关键区域的坝体材料强度参数下降,那么强度系数就会从当前地下水位的 1.532 降至预测坝体供水量的 1.372。这个数字是其初始稳定性的 10%以上。实际意义。所获得的结果证明了其必要性;此外,这些结果还具有实用价值,可用于改进对所分析尾矿库的水文、水文地质和岩土工程监测,以确保其在关闭、重新开垦或修复期间的进一步行为的不同条件下的辐射安全。
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Analyzing stability of protective structures as the elements of geotechnical tailing pond safety
Purpose is the assessment of soil retaining wall stability to ensure geotechnical safety during the radioactive waste tailing pond closure and further recultivation (or rehabilitation) in Kamianske town (Ukraine). Methods. Geomechanical stability of the protective structure has been assessed relying upon the analysis of geological-hydrogeological, engineering-geological, and geotechnical conditions of the certain tailing pond area using a deformation elastic-plastic model of a medium implemented on the basis of finite-element method. For the purpose, the dam slopes have been detalized taking into consideration their geometry as well as changes in vertical section of rock material characteristics in accordance with the earlier geophysical studies; exploration drilling; and engineering-geological surveys. Findings. Stability coefficients of protective tailing pond dam have been identified within the typical areas of a hydraulic structure; it provides high reliability and representativeness of the whole structure health in time as well as under various conditions of the industrial waste water saturation. It has been defined that the stability coefficients varies from ks = 1.372 to 4.758. Comparison of the indicators between 2022 and 2016 demonstrates a tendency of the slope stability coefficient decrease due to water saturation and groundwater level rise. Nevertheless, design characteristics of the structure make it possible to ensure satisfactory a stability coefficient along the whole dam length being 1.13 times higher than the standard one (i.e. ks = 1.250). Originality. The dependence of the tailing pond protective dam stability upon a water supply degree at the forecasted groundwater level rise at the expense of atmospheric and melt water ingress to the tailing pond has been defined. The danger of complete radioactive waste water saturation is a significant reduction in the stability coefficient of the protective structure, which can be supported by predictive modelling data. If strength parameters of a dam material decline for the most critical area then the strength coefficient decreases starting from 1.532 in terms of the current groundwater level down to 1.372 as for the forecasted dam water supply. The figure is more than 10% of its initial stability. Practical implications. The obtained results substantiate the necessity; moreover, they are of practical value while improving hydrological, hydrogeological, and geotechnical monitoring of the analyzed tailing pond to ensure its radiation safety under different conditions of further behaviour during closure, recultivation, or rehabilitation.
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来源期刊
Mining of Mineral Deposits
Mining of Mineral Deposits MINING & MINERAL PROCESSING-
CiteScore
5.20
自引率
15.80%
发文量
52
期刊最新文献
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