An abandoned gypsum mine has been discovered beneath the route of a highway construction in Hunan province, south China. Due to the highway construction The clearing strength and weakening mechanism effects of the gypsum rock with long-term overlying strata pressure are the keys to revealing the collapse mechanism of gypsum mined gob and predicting Experimental Study on Strength Weakening of
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year. The production of gypsum in Ukraine has been from 1.5 to 1.7 million tons per year throughout the past 5 years. The largest deposit of gypsum in Ukraine is Artemivsk Owing to weathering and mining activities, gypsum rock pillar damage and failure will occur, thereby inducing a large area of gypsum mined-gob collapse accidents Damage Mechanism and Stress Distribution of Gypsum Rock
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Abstract. The impacts of quarrying of the gypsum deposits on the environment at Maqna, Tabuk, were evaluated by intensive field studies including in situ The present work investigated the differences in the composition and internal microstructure of four types gypsum rock—fiber gypsum, transparent gypsum, Experimental investigation into the effects of composition
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Apart from the lax sealing of some mining areas, gypsum mine goafs are generally sealed quite well. Thus, a goaf can be regarded as a closed space with constant temperature and humidity. Temperature Roadway backfilling mining is vital for ensuring the safety of surface buildings while mining coal underneath buildings, railways, and water bodies. The technique and backfilling material, however, need to be optimized to ensure the long-term safety of the project and surface structures. Using a mine as the engineering background, reasonable Experimental study on roadway backfill mining of paste-like
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The room-pillar mining technology of underground gypsum resources results in numerous gypsum rock pillars for controlling and supporting mined gobs, which forms a large area of roof hanging gobs. Owing to weathering and mining activities, gypsum rock pillar damage and failure will occur, thereby inducing a large area of gypsum mined The impacts of quarrying of the gypsum deposits on the environment at Maqna, Tabuk, were evaluated by intensive field studies including in situ testing, mapping and sampling of gypsum and well water. Field and laboratory tests were made to determine the engineering properties including tensile and compressive strengths, unit weight, Environmental impacts of the gypsum mining operation at
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Tait et al. (2009) have performed gypsum crystallization laboratory experiments and aqueous equilibria simulations with and without the effects of ion activity and ion association. Even though, lime precipitation has been used for mine water treatment for decades, the effect of solution conditions is not adequately known.Industrial mining projects can play an important role in global sustainable development if associated health risks are minimised and opportunities maximised. While a broad body of evidence from quantitative studies exists that establishes the interlinkages between mining operations and effects on public health, little research has been Health impacts of industrial mining on surrounding
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Gypsum samples with different diameters were prepared to investigate the effect of sample size on strength parameters. Hoek and Brown (1980) addressed the importance of sample size and provided a correlation between sample size and a dimensionless form of UCS as follows: (1) U C S / U C S (50) = (50 / D) 0.18 where UCS The development of a solid waste grouting material has become a current research effort in the field. This study examined the effect of incorporating gypsum dihydrate (NG), flue gas desulfurization (FGD) gypsum, and phosphogypsum (PG) on the workability and mechanical properties of red mud-slag grouting materials with different gypsum Effect of different gypsums on the workability and
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Thus magnesium was preventing the removal of sulphate as gypsum (CaSO42H2O). However, change in the lime precipitation pH from 9.6 to 12.5 resulted in magnesium hydroxide (Mg (OH)2mining. This has adverse effect on growth of vegetation and agricultural produce. i. Vegetation supporting capacityof the top soil in the tensile zone of subsiding area may be impaired. j. Discharge of polluted water from underground mine to surface water bodies affects their aquatic ecology. k.Impact of Mining Activity on environment: An Overview
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Environmental Impact of Gypsum Mining in Some Selected Communities of Fika Local Government Area of Yobe State, Northeastern Nigeria. Jazuli Aminu Ahmed & Moisule Abubakar Moigonga 118 The variables measured include the depths and diameters of the pits. The land area occupied by mining activities and the land area occupied by the Gypsum Rock with Effect of Long-Term Overlying Strata Pressure. Sustainability 2022, 14, 11442. The Luneng gypsum mine is located in Tai’an City, Shandong Province, China andExperimental Study on Strength Weakening of Gypsum
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Effects of increasing concentrations of unamended and gypsum modified bauxite residues on soil microbial community functions and structure A mesocosm study (Burke et al., 2013). Moreover, by reducing the Na content, gypsum addition is known to encourage aggregation and improve the structure of bauxite residues (Xue et al., 2016However, the effects of TG on the high-calcium FA–CCR system and the transformation rule of Fe compound in TG remain unclear. Therefore, FA–CCR and FA–natural gypsum–CCR were used as the control group. The effects of TG on the physical properties, phase composition, and microstructure of the FA–CCR system were studied.Effects and mechanisms of waste gypsum influencing the
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Two field experiments were conducted at Kafr El Sheikh Gov., Egypt, during two winter growing seasons (2020/2021 and 2021/2022). The objective of this study was to improve some chemical and physical properties of soil and the yield and water productivity of faba beans (Viciafaba L.), Cv. Sakha-4 by application of gypsum, compost, and some The present study investigates the effect of β-hemihydrate gypsum (HG) dosages on the mechanical and microstructural performance of cemented paste backfill (CPB) produced from sulphide-rich mine tailings using NaOH-activated slag (NAS) as the major binder. X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury Effect of Gypsum Addition on the Mechanical and
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Specimens of Gammarus balcanicus were collected upstream of a gypsum mine (Site 1) in the Kosovčica Spring and downstream of the mine in the Kosovčica River (Site 2) during June 2011 (Fig. 1).Adult organisms were collected using a standard hand net (frame size 0.25 × 0.25 m; 0.5 mm mesh) and were stored in plastic bottles containing The Centre for Environment and Education–Himalaya and Welthungerhilfe [formerly the German Agro Action], a nongovernmental organization working on environment, development and earthquake response in Uri, has carried out a mini-survey on the health hazards of gypsum mining. “[Gypsum mining] has had harmful effects. Medical Gypsum Extraction in Kashmir Impacts Health, Environment
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Soil pollution is a major problem worldwide. Some anthropogenic activities, such as mining, may exceed soil capacity, causing relevant health and ecosystem hazards. The use of mineral amendments can help reduce soil pollution. Gypsum mining spoil (GS) is a waste material highly produced in gypsum mining industry, which has never been used Effect of magnesium on sulphate removal from mine water as gypsum was investigated. Calculations with MINEQL+ and jar test experiments were conducted at two pH values. At pH 9.6 magnesium inhibits the precipitation of sulphate as gypsum. At pH 12.5 magnesium could have a positive effect on sulphate removal.The effect of magnesium on partial sulphate removal from mine water
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The aim was to perform an economic appraisal of different restoration options for gypsum habitats after mining, analysing the effectiveness of the most feasible options comparing both, ecological
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