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fracture developmen Tdue to coal mining under

  • Prediction of Fractures in Coal Seams with Multi …

    2019-4-24 · To ensure coal mining safety, high-accuracy three-dimensional seismic technology can be applied to determine the distribution of the coal seam and extract information on fracture development 21,22 ...

  • Study on Development Law of Mining-Induced Slope …

    2021-6-4 · The development law of mining cracks in shallow coal seams under gully topography was used as the research base to analyze the development characteristics of mining cracks in the 5-2 coal mining face of Anshan Coal Mine, and the weak strength was established. The basic top force model under the action of the overburden is the "nonuniformly distributed load …

  • Fracture Propagation and Hydraulic Properties of a Coal ...

    2020-12-7 · Longquan coal mine serves as the case where the panel works closely above the floor with high water pressure. By the combination of physical and numerical modelling approaches, the variation characteristics of fracture development and volumetric strain of floor rocks subjected to mining disturbance are analyzed.

  • Study on the Law of Fracture Evolution under Repeated ...

    (3) The fracture zone height of 222 and 224 face under repeated mining in the 4-2 coal seam was 19.56–22.31 times and 22.38–24.54 times larger, respectively, and the post-mining fracture extension of the face with larger width and deeper burial under repeated mining was higher than that of the adjacent face.

  • Study of the Fracture Law of Overlying Strata under Water ...

    The development characteristics of fractures due to coal mining under deep unconformable overlying strata was investigated using the similar model …

  • Fracture development and fractal characteristics of ...

    2021-2-2 · The purpose of this paper is to provide scientific basis for the stability evaluation of overburden rock of repeated mining goaf under the expressway. The objectives of the present study are to reveal the development of overburden rock fractures under repeated mining and to identify the fractal characteristics of the overburden rock fractures. The results show that (1) …

  • New Insights into Failure Behaviors of Tectonic Coal Under ...

    2021-11-30 · Coal and gas outbursts cause several damages to underground mining activities. The outburst events have been recorded for a long period of time in many coalfields (Harvey and Singh 1998; Karacan et al. 2011; Lama and Bodziony 1998).The understanding of outburst is enhanced with the development of coal mining industry and it is generally regarded that there …

  • Energies | Free Full-Text | Development Patterns of ...

    The key to the safe mining of thick coal seams under rivers is understanding the development patterns of fractured water-conducting zones (FWCZ) when various mining methods are used. To solve this problem, we employed numerical simulation to investigate FWCZ when slice mining and longwall caving mining are performed. When slice mining was carried out, the maximum height …

  • Temporal and spatial evolution characteristics of fracture ...

    2021-11-24 · Under the same coal measure stratum condition, several similarities in floor failure characteristics were observed between coal seam floor with and without faults during coal seam mining: a. Both the models of floor strata begin to break in high-stress area before mining.

  • Investigation of Fracture Development and Oilfield ...

    2021-7-31 · China is rich in primary energy resources. Due to specific terrain conditions, different types of problems may occur in the process of development. When the coal seams are located under the oil layers, due to the physical characteristics of oil, the exploitation of coal seams will cause losses to the oil layers, and the volatile oil may also cause threats to coal mining. To …

  • Mechanism of Water Inrush from Coal Floor Fracture in ...

    2014-8-21 · into Connection fracture under the upward vertical pressure in the bottom and the powerful limestone water pressure, finally forming water inrush. In progressive liters of fracture, along with the advancement of coal seam mining, the goaf'' two sides are the compressive stress, the roof is the tensile stress area, there are concentration

  • Experimental Study on the Mechanical Behavior of Coal ...

    2021-12-1 · When mining-induced fractures reach overlying aquifers, water enters the mining area and the coal is under different natural water saturation conditions, which significantly affect the mechanical behavior of the coal. In this study, uniaxial compression tests were conducted on dry, partially saturated, quasi-saturated, and fully saturated coal samples. The mechanical …

  • Fracture Development at Laminated Floor Layers Under ...

    2020-5-16 · The increment of stress level and fracture depth in deep longwall mining can cause groundwater inrush accidents frequently, and it is essential to study the characteristics of fracture development around laminated rock layers at the floor. This can help to understand the mechanism of groundwater inrush events and to reduce the potential risk. According to the …

  • Experimental Study on the Change of the Pore-Fracture ...

    2020-12-30 · After a coal mine is abandoned, a large amount of coalbed methane (CBM) resources is still accumulated in the overlying and underlying coal strata. The structure of the coal/rock pore fracture, which is a key element for the development of CBM resources, changes significantly due to the influence of mining. In this study, the pore volume and pore size …

  • Fracture development due to coal mining under ...

    Abstract: The development characteristics of fractures due to coal mining under deep unconformable overlying strata was investigated using the similar model test and DEM numerical simulation,and taking No.3 coal seam of Shizuishan in Ningxia Province as the engineering background.The comparison was performed between the results obtained from the similar …

  • Influence of fracture-induced weakening on coal mine ...

    2016-10-1 · As a result of the strong influence ahead of mining face, the gateroad undergoes significant ground destabilization and deformation. In the case of the gateroad of panel 11050, under the mining influence, deformation increments of floor and ribs are more significant than that of the roof due to the weak properties of coal.

  • Coal and rock fissure evolution and distribution ...

    2013-11-1 · Fracture development due to coal mining under unconformable overlying strata. J China Coal Soc, 36 (11) (2011), pp. 1795-1800. View Record in Scopus Google Scholar. C.Y. Wang, Tim LAW K. Review of borehole camera technology. Chinese J Rock Mech Eng, 24 (19) (2005), pp. 3440-3448.

  • IMPACT OF COAL MINING ACTIVITIES ON GROUND …

    2013-2-21 · impact of coal mining on gw regime hydrogeological aspects: dtw varies from 7-18 mbgl around active mine establishments. due to seepage of gw into mines dtw declines considerably in wells & even wells get dry during summer in the vicinity of coal mines.

  • Hydraulic Fracturing in Underground Coal Mines

    2019-1-18 · Keywords: Hydraulic fracturing, mine gas drainage, borehole casing, cementing and slotting. 1. INTRODUCTION . Hydraulic fracturing (HF) is a method of stimulating gas production through the injection of fluid under pressure into the coal formation to create fractures.

  • An approach to predict the height of fractured water ...

    2018-7-20 · To ensure the mining safety of shallow coal seams under water-rich aquifers and determine the development of the fractured water-conducting zone, Liu 7 built a numerical model to analyze the ...

  • Characteristics of Stratum Structure and Fracture ...

    2021-11-10 · fied mining of thick coal seam. Taking Rujiigou anthracite company in Helanshan coal-field of NingXia Province of China as engineering back-ground, this paper discusses the structure and fracture development law of overburden rock strata in multisection stratified mining of ultrathick coal seam under the condition of shallow buried mining.

  • Method to Calculate Mining-Induced Fracture Based on …

    2021-9-17 · Mining-induced fracture of overburden strata is intimately related to underground water disasters in coal mining. In this work, we develop an analytical model that uses the probability integral method to calculate the subsidence of the subsurface and the overburden strata. In the developed model, according to the failure characteristics of the mining-induced …

  • Forecasting water disaster for a coal mine under the ...

    The development characteristics of fractures due to coal mining under deep unconformable overlying strata was investigated using the similar model …

  • Fracture and pore development law of coal under organic ...

    Organic solvent erosion is an efficient method to promote fracture and pore development in coal. However, the law of fracture and pore development in the process of …

  • Pore and fracture development in coal under stress ...

    Pore and fracture development in coal under stress conditions are investigated based on NMR and fractal theory. The results show that the accumulation of NMR signal intensity as well as sample porosity decrease slightly at first, then increase slowly, and finally increase rapidly during the deformation of coal.

  • HAZARDS IN THE COAL MINING INDUSTRY

    2020-8-6 · ''Made evallable under IASR sponsorhfp ESC No. 355-9 in the interest of early and wide dis-stmination of Eartb Resources Survey E 7. 40. 2 38 Proam information and without liability 7 .- 10- 3&-for any use made thereof." APPLICATION OF ERTS-1 IMAGERY TO FRACTURE RELATED MINE SAFETY HAZARDS IN THE COAL MINING INDUSTRY

  • MINING COAL, MOUNTING COSTS

    2011-3-17 · COAL MINING 1 Underground M: Since 1900, accidents have killed over 100,000 U.S. miners; over 200,000 have died from black lung disease. E: These deaths and illnesses are re!ected in wages and workers'' comp, costs considered internal to the coal industry, but long-term sup-port often depends on state and federal funds.

  • Development characteristics and field detection of ...

    Under the different coal pillar conditions, the fracture struc-ture of the basic roof and the resulting fracture development zone demonstrate different evolution laws.23 The damage degree of the overlying strata can directly af-fect the occurrence of coal mine disasters. 24,25 The large intact

  • Fracture Development at Laminated Floor Layers Under ...

    Water inrush at floor area is a natural hazard during coal mining. Especially in the northern coalfield of China, more than 55% of coal mines are threatened by water inrush at floor area.

  • Energies | Free Full-Text | Ground Fracture Development ...

    An observatory was established at the Ningtiaota Mine (China) in order to investigate the surface deformation pattern of N00 method workings mining in shallow buried thick coal seams in a windy-sand area. The observatory allows one to measure the coupling between the periodic changes of parameters related to ground subsidence and ground cracks with workings advancement.

  • Gas-driven rapid fracture propagation under unloading ...

    Introduction. Coal and gas outbursts during coal mining is a violent dislodgement and ejection of coal as a consequence of sudden release, at a working face, of the internal gas and strain energy.1, 2, 3 In some instances, as much as thousands of cubic metres of methane or carbon dioxide and hundreds of tonnes of fragmented coal mass are emitted from a working face over …

  • Coal Mining: Injuries, Illnesses, and Fatalities Fact Sheet

    2021-12-18 · Coal mining: 24.8 per 100,000 full-time equivalent workers. There were 28 fatal injuries in coal mining in 2007, down from an average of 31 fatalities per year from 2003 to 2006. In 2007, 20 fatalities (or 71 percent of all fatalities …

  • Study on the Evolution Law of Fracture Field in Full ...

    2020-10-9 · overburden fracture under the condition of superthick coal seam are explained. is study provides a theoretical basis for the study of the development of the overburden fracture and the treatment of the water and gas drainage in the overburden goaf. 2. Engineering Geological Conditions Datong mining area is a mining area of double-system coal

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