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Triggering mechanism and dynamic process of water-rock flow in Nanfen waste dump in 2010

Journal of Mountain Science 2021年第10期18卷 2565-2579页

作者： CAO Chun-hui FENG Ji-li TAO Zhi-gang State Key Laboratory for Deep Geomechanics and Underground Engineering China University of Mining and Technology BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology BeijingBeijing 100083China

Water-rock flow is a kind of debris flow with more coarse particles and low viscosity, which occurs in many areas of the world. In this work, the water-rock flow that occurred on May 24, 2010, at Nanfen’s open-pit mine of China was investigated by combining field investigation, meteorological and hydrological survey with numerical simulation to understand its triggering mechanism and dynamic process. The field data shows that the short-term high-intensity rainfall is the most direct inducement to trigger water-rock flow in the waste dump. The loose shallow gravel soil and the V-shaped valley with a certain slope provide the necessary conditions of the occurrence of water-rock flow in the waste dump. Moreover, the possibility criterion of water-rock flow is presented by analyzing the historical rainfall data. In addition, the smoothed particle hydrodynamics(SPH) method was employed to simulate the waterrock flow under the conditions of Newtonian fluid with uniform distribution of water and coarse-grained materials. The simulating results show that the flow distance, velocity, shape, and deposition profile of water-rock flow are in good agreement with the field observation. The present work is beneficial to the risk assessment and mitigation design of water-rock flow disaster in the waste dump.

关键词： Water-rock flow waste dump Triggering mechanism Smoothed particle hydrodynamics Rainfall intensity

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Occurrence,leaching,and mobility of major and trace elements in a coal mining waste dump:The case of Douro Coalfield,Portugal

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Energy Geoscience 2021年第2期2卷 121-128页

作者： J.Ribeiro D.Flores Department of Earth Sciences University of CoimbraRua Silvio Lima3030-790CoimbraPortugal Institute of Earth Sciences-Porto Pole Rua Do Campo Alegre 6874169-007PortoPortugal Environment and Spatial Planning Department of GeosciencesUniversity of PortoRua Do Campo Alegre 6874169-007PortoPortugal

The coal mining residues from past mining activities in the Douro Coalfield are emplaced in many dumps near the mining areas,causing substantial environmental *** study aims to contribute to the investigation of environmental impacts caused by the disposal of the residue in the Douro Coalfield through the determination of the geochemical composition of waste materials collected at 3 e 15 m depth,and of the water-leachable fraction produced by percolation in these materials inside the *** elements with higher concentration in the leachates are Ca,Cd,Co,Mg,Mn,Na,Ni,S,and Zn,indicating that they are the most easily leached and accessible elements for percolation and mobilization into the *** presence of these elements in the leachates is principally attributed to their occurrence as water-soluble ions in clays and sulphides affected by natural weathering conditions,which promotes their breakdown and occurrence as exchangeable *** leachates are classified as acid *** weathering and leaching in the Sao Pedro da Cova waste dump are the principal~paths for chemical elements to be percolated and mobilized to environment,posing risk to the soils,waters and ecosystems in the surrounding areas.

关键词： Coal mining waste dump Water-soluble compound Hazardous element

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Stability Analysis and Remediation of the Slope at a Disused External waste dump

Stability Analysis and Remediation of the Slope at a Disused...

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作者： Chong CHEN Hainan GAO Department of Engineering Physics Tsinghua University School of Mechanics & Civil Engineering China University of Mining & Technology-Beijing

This study presents a large-scale failure of a disused external waste dump at the Dagushan iron mine,one of the deepest iron open pit mines in *** landslide involved 7,000,000 m3 in volume of loose mass *** material,gravel and *** failure mode of the slope is described based on the detailed results of field *** investigation was carried out to obtain mechanics parameters for stability *** cases were simulated by SLOPE/W,which is based on limit equilibrium method,to estimate the failure mode and dominant cause for *** results indicate that,the entire slope is stable under undisturbed condition,the factor of safety decreases as slope toe cutting,and the slope become unstable as moisture of basement clay increases to *** failure initiates at the toe of the slope and then extends to the crest of the *** slip circle generates from the crest position and touches the *** for the landslide including cutting and unloading,gabion retaining wall,and drainage are *** results show that these measures were effective in controlling the landslide.

关键词： waste dump landslide stability analysis remediation

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Natural vegetation recovery on waste dump in opencast coalmine area

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Journal of Forestry Research 2005年第1期16卷 55-57,i003页

作者： CHENGJian-long LUZhao-hua InstituteofRestorationEcology ChinaUniversityofMiningandTechnologyBeijing100083P.R.China

The changes of vegetation compositions, plant species diversity, species important value and succession of plant community were studied on waste dumps in Haizhou opencast coalmine which is located in the west of Liaoning Province, China (41°41(-42°56( N, 121°1(-122°56(E). Four kinds of terraces with different ages (5, 10, 20 and 40 years) were selected for investigation of plants. Total of 63 species of natural colonized plants were recorded on the waste dump and they belong to 23 families. The main families were Compositae (15 species), Fabaceae (11 species) and Leguminosae (8 species), which accounted for 54.0% of total species and play an important role in natural vegetation recovery in waste dump area. The dominant species on 5-, 10-, 20-, 40-year-old terraces were Tribulus terrestris + Echinochloa hispidula + Salsola collina, Echinochloa hispidula + Artemisia sieversiana + Artemisia scoparia, Echinochloa hispidula + Clinelymus dahuricus + Artemisia scoparia + Artemisia sieversiana + Melilotus officinalis, Clinelymus dahuricus+Phragmites communis + Echinochloa hispidula+ Setaria viridis, respectively. According to the important value of species calculated. It is determined that Tribulus terrestris can act as pioneer species on waste dump and Clinelymus dahuricus, Phragmites communis and Echinochloah hispidula are important dominant species in vegetation restoration in Haizhou opencast coalmine. The study results can provide scientific basis for selecting and disposing appropriately plant species and rehabilitating vegetation on waste dumps of coalmine.

关键词： Haizhou Opencast coalmine waste dump Plant community Restoration

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Physical simulation test of soil-rock mixture from synthetic transparent soil

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Journal of Central South University 2018年第12期25卷 3085-3097页

作者： DING Xiao-hua ZHOU Wei LU Xiang GAO Yan School of Mines China University of Mining&TechnologyXuzhou221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&TechnologyXuzhou221116China

The waste dump of open-pit coal mine is remade of soil-rock mixture under the action of gravity,dynamic load of transportation equipment and earthquake,*** using artificial synthetic transparent soil,the developing process and migration law for soil-rock mixture are observed in the remade *** mixture of fused quartz sand,liquid paraffin and n-tridecane is chosen as the material for synthetic transparent soil which is mixed with liquid paraffin and n-tridecane at a mass ratio of4.4at room temperature of17℃.Physical and mechanical properties of transparent soil are determined by physical test and compared with those in natural sandy *** results show that transparent soil and sandy soil have high similarity,in other words,transparent soil can be used for similar simulation experiments of soil-rock mixture.

关键词： transparent soil waste dump soil-rock mixture physical test

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Innuendoes of Sterilisation Drilling in Surface Mining Operations—A Case Study

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International Journal of Geosciences 2024年第5期15卷 458-477页

作者： Richard Gyebuni Festus Kunkyin-Saadaari Isaac Ekow Anaman Department of Mining Engineering University of Mine and Technology Tarkwa Ghana Mining Engineering Department Ghana Manganese Company Tarkwa Ghana

Surface mining operations play a crucial role in meeting the world’s increasing demand for mineral resources for the advancement of technology and debauched expansion of economies. The search for and exploitation of these mineral resources are therefore important for the sustainability of the mineral extraction industry. To this end, efficient mine planning must incorporate sterilisation drilling and effective waste rock management principles in the search and exploitation of these minerals. In this article, sterilisation drilling is being reviewed vis-a-vis the establishment of waste and tailings dump locations, backfilling of open pit excavations and mine closure giving critical attention to the minerals and mining laws of Ghana. Subsequently, a detailed case study of a surface mining operation that successfully incorporated sterilisation drilling in determining waste dump location in its mine planning process has been presented in this study. The findings indicate that the proposed waste dump location could present a potential mining prospect in the future based on enhanced milling capacity/technology and improved mineral commodity price;underscoring the significance of sterilization drilling in the sustainability of the mining industry.

关键词： Sterilisation Exploration Backfilling waste dump Cutoff Grade

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