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Coal waste management practices in the USA:an overview

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International Journal of Coal Science & Technology 2014年第2期1卷 163-176页

作者： yoginder p.chugh paul T.Behum Mining and Mineral Resources Engineering Southern Illinois UniversityCarbondaleIL 62901USA Office of Surface Mining AltonILUSA

This paper provides an overview of coal waste management practices with two case studies and an estimate of management cost in 2010 US *** of as-mined coal typically results in considerable amount of coarse and fine coal processing wastes because of in-seam and out-of-seam dilution *** plant clean coal recovery values run typically 50%-80%.Trace metals and sulfur may be present in waste materials that may result in leachate water with corrosive *** discharges may require special measures such as liner and collection systems,and treatment to neutralize acid drainage and/or water quality for trace *** potential for variations in coal waste production and quality depends upon mining or processing,plus the long-term methods of waste *** changes in waste generation rates and engineering properties of the coal waste during the life of the facility must be ***,economical and environmentally acceptable management of coal waste involves consideration of geology,soil and rock mechanics,hydrology,hydraulics,geochemistry,soil science,agronomy and environmental *** support all aspects of the regulatory environment including the design and construction of earth and rock embankments and dams,as well as a wide variety of waste disposal *** of impoundments is critical and require considerations of typical water-impounding dams and additional requirements of coal waste disposal *** primary purpose of a coal waste disposal facility is to dispose of unusable waste materials from ***,at some sites coal waste impoundments serve to provide water storage capacity for processing and flood attenuation.

关键词： Coal waste Coarse coal processing waste Fine coal processing waste Coal refuse Out-of-seam dilution Dilution impacts Environmental impacts Reclamations

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长壁工作面巷顶沿空掘巷围岩应力分析

岩土力学 2018年第9期39卷 3395-3405页

作者：王朋飞冯国瑞赵景礼 yoginder p.chugh 王志强太原理工大学矿业工程学院山西太原030024 中国矿业大学(北京)资源与安全工程学院北京100083 美国发明家学会美国坦帕

镇城底矿工作面的回采巷道一条沿顶板掘进,一条沿底板掘进,相邻两工作面在端头搭接,沿底板掘进的巷道形成巷顶沿空掘巷。通过理论分析、相似模拟、数值模拟及现场实测对巷顶沿空掘巷围岩结构及应力环境进行了研究。得到如下结论:该巷道... 详细信息

镇城底矿工作面的回采巷道一条沿顶板掘进,一条沿底板掘进,相邻两工作面在端头搭接,沿底板掘进的巷道形成巷顶沿空掘巷。通过理论分析、相似模拟、数值模拟及现场实测对巷顶沿空掘巷围岩结构及应力环境进行了研究。得到如下结论:该巷道不受超前和固定支承压力影响,大结构下方的矸石垫层可起到能量和应力耗散的作用,避免了动载和冲击影响,应力低且稳定;岩层移动形成的垮落角对采空区应力大小和分布(尤其采空区边缘)有重要影响;垮落角越小,采空区应力越小,该巷道围岩应力越小,采空区恢复至原岩应力的距离越大;垮落角对岩体塑性区发育方向起控制和导向作用;该巷道围岩应力大幅低于原岩应力,卸压程度大;实测该巷道竖向和横向位移均比非沿空巷道小,即顶底板和两帮应力环境均得到改善。研究对维护具有冲击倾向的高应力巷道具有一定意义。

关键词：错层位沿空掘巷双屈服采空区冲击倾向高应力

Concurrent mining and reclamation for underground coal mining subsidence impacts in China

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International Journal of Coal Science & Technology 2018年第1期5卷 18-35页

作者： yoginder p. chugh National Academy of Inventors Tampa FL USA Southern Illinois University Carbondale CarbondaleIL 62901 USA

Large scale underground mining of coal resources in China using longwall mining has resulted in ecological and environment problems, including surface subsidence that is considered serious due to competing interests of prime agricultural lands, food security, and regional economic development. The subsided lands must be rehabilitated soon after mining to be agriculturally productive to minimize loss of farmland. Similarly, precious water resources must also be managed during and after mining to protect this natural resource. Toward these goals, the concept of ＂Concurrent mining and subsidence reclamation （CMR）＂ was proposed by professor Hu of the China University of Mining and Technology, Beijing （CUMTB）. Over the last two decades CMR concepts have evolved and successfully applied in the field in different parts of China. This innovative technology has increased available farmland during the mining process, and provided better land protection and food security in mining areas even with high groundwater table. The technology has been used in 5 of the 14 large coal bases in China. This paper describes the technology concepts, design and guiding principles for planning with two case studies from different regions to enhance its application both in China and in other countries.

关键词： Mining subsidence Farmland and water resources protection Concurrent mining and subsidence reclamation planning

Management of coal processing wastes： studies on an alternate technology for control of sulfate and chloride discharge

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International Journal of Coal Science & Technology 2018年第1期5卷 54-63页

作者： paul T. Behum yoginder p. chugh Liliana Lefticariu Office of Surface Mining and Reclamation Enforcement Alton IL 62002 USA National Academy of Inventors Tampa FL 33612 USA Department of Mining and Mineral Engineering Southern Illinois University Carbondale Carbondale IL 62901 USA Department of Geology Southern Illinois University Carbondale Carbondale IL 62901 USA

Management of coal mining and coal processing wastes, particularly of high sulfur coals, can generate excessive amounts of sulfate （SO4^2-） and chloride （Cl^-） in mine drainage that are known to negatively impact quality of both surface and ground water. The U.S. Environmental protection Agency provides guidance to states on allowable SO4^2- and Cl^- discharges from mine sites. This research evaluates the hypothesis that co-disposal of CCpW and FCpW with appropriate compaction can result in improved geochemical and geotechnical environments that will minimize acid mine drainage formation and SO4^2- and Cl^- discharges. Addition of ground limestone （ag-lime） to the mix was also evaluated as a drying agent and for improvement in overall geochemistry by buffering higher pH values within the coal waste. These objectives were to develop and implement innovative concepts for engineered co-management of CCpW and FCpW at coal mining sites. The authors performed long-term field column leaching studies to analyze improvement in SO4^2- and Cl^- in water quality. Requirements for stricter standards in some states led to the need for development of potentially improved environmental practices. This paper presents the overall encouraging results of the field kinetic studies.

关键词： Kinetic testing Acid mine drainage Coal chemistry Interior Basin Refuse co-disposal

长壁采空区对采动煤岩应力分布规律的影响研究

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岩土工程学报 2018年第7期40卷 1237-1246页

作者：王朋飞冯国瑞赵景礼 chugh yoginder p 王志强太原理工大学矿业工程学院山西太原030024 中国矿业大学(北京)资源与安全工程学院北京100083 俄罗斯自然科学院莫斯科119991 美国南伊利诺伊大学采矿与矿物工程学院卡本戴尔62901 美国发明家学会佛罗里达33612

随着当前各类长壁采空区及其附近区段巷道留设技术的不断推广,采空区及其对采动煤岩应力分布规律影响的认识愈发重要。鉴于当下此方面的研究较少,以镇城底矿为工程背景,通过理论分析、相似模拟、数值模拟和现场实测研究了长壁采空区对... 详细信息

随着当前各类长壁采空区及其附近区段巷道留设技术的不断推广,采空区及其对采动煤岩应力分布规律影响的认识愈发重要。鉴于当下此方面的研究较少,以镇城底矿为工程背景,通过理论分析、相似模拟、数值模拟和现场实测研究了长壁采空区对采动煤岩应力分布规律的影响。多种研究方法表明,采空区承载越大,实体围岩受载则越低,反之亦然。错层位不对称工作面导致应力分布亦不对称,缓坡段采空区应力大于无缓坡段,而缓坡段侧支承压力小于无缓坡段侧,缓坡段具有压力和能量缓冲耗散作用的矸石垫层,可避免接续面巷顶沿空巷道受动载影响。得出基于采空区影响下的老顶关键块回转下沉量计算方法。断裂角越小,采空区承载越小,尤其采空区边缘应力越小。采空区会影响围岩体中应力集中区的应力集中程度、范围和方位,同时影响煤岩体塑性区大小。理论分析、模拟分析和现场实测具有较好的一致性。

关键词：采空区采动应力错层位不对称断裂角

Mine Closure practices:An Important Research Area for China

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Mine Closure Practices:An Important Research Area for China