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首页> 外文期刊>Bulletin of engineering geology and the environment >Characterisation of overburden dump materials: a case study from the Wardha valley coal field
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Characterisation of overburden dump materials: a case study from the Wardha valley coal field

机译：覆盖层堆放物料的特征：以沃达河谷煤田为例

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Recently, large-scale opencast mining activities in India have led not only to the increased generation of large volumes of overburden (OB) dump materials, but also to the transportation of huge volumes of loose geo-materials from coal faces to areas specifically designated for storing these materials in the form of external or internal dumps. The preparation of large-sized dumps is becoming a challenging task for the mining administration from two important perspectives, namely the limited availability of surface leasehold land for dumping geo-materials, and the associated problems of managing the increasing heights of these geo-structures. Normally, the assessment of stability, and taking proper steps to stabilise these external OB dumps, is a trivial task, but because of the increased risks involved with geo-hazards, the design and monitoring of such dumps is currently becoming critical for the production/operation of any mining organisation. Thus, a knowledge and awareness of the detailed nature and mechanical properties of the selected geo-materials present at these sites is becoming more important for stability assessment of OB dumps. In this study, the collected geo-materials (which are agglomerates of broken rocks and loose soil) were tested to evaluate their geotechnical parameters such as grain size distribution, soil permeability, compaction parameters, shear and normal strength characteristics, etc. These tests show that testing of geo-materials from one site is not sufficient for complete and proper site characterisation that would allow these values to be used subsequently in numerical modelling to quantify the stability of OB dumps. Therefor, it was decided that a geotechnical database for groups of geo-materials needs to be generated for the complete evaluation of OB dump stability for all mine sites in the areas of interest.
机译：最近，印度的大规模露天采矿活动不仅导致增加了大量表土（OB）堆放材料的产生，而且还导致了将大量松散的土工材料从煤层运输到专门指定的区域以外部或内部转储的形式存储这些材料。从两个重要的角度来看，准备大型垃圾场正成为采矿管理部门的一项艰巨任务，即用于倾倒土工材料的地面租赁土地有限，以及管理这些土工结构的高度增加的相关问题。通常，评估稳定性并采取适当步骤稳定这些外部OB转储是一项琐碎的任务，但是由于地质灾害带来的风险增加，因此此类转储的设计和监控对于生产/任何采矿组织的运作。因此，对于这些场址存在的选定土工材料的详细性质和机械特性的了解和认识对于OB垃圾场的稳定性评估变得越来越重要。在这项研究中，对收集的土工材料（破碎的岩石和松散的土壤的团聚体）进行了测试，以评估其岩土工程参数，例如粒度分布，土壤渗透性，压实参数，剪切强度和法向强度特性等。这些测试表明从一个站点进行土工材料测试不足以进行完整而正确的站点表征，这将使这些值随后可用于数值建模中以量化OB转储的稳定性。因此，决定需要为一组土工材料生成一个土工数据库，以便对感兴趣区域内所有矿场的OB倾卸物稳定性进行全面评估。

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