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Gas extraction is most commonly used to control gas disasters in coal mines. The distribution of the plastic zone around a borehole and the sealing quality are key factors affecting gas extraction. …
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This study considered the role of coal as China's basic energy source and examines the development of the coal industry. We focused on the intelligent development of coal mines, and introduced the "Chinese mode" of intelligent mining in underground coal mines, which uses complete sets of technical equipment to propose classification and …
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As a pre-mining detection borehole, borehole B1 is applied to detect the development of original fractures in overlying strata. For comparisons, boreholes B2 and B3 are applied to detect the ...
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Directional long borehole has been promoted in underground coal mines. However, the hydraulic fracturing technology based on directional long borehole in underground coal mines is still in the initial stage. The uneven fracture distribution and small number of fractures in the conventional hydraulic fracturing with constant injecting rate is …
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The directional hydraulic mining and associated technical equipment were applied in Hudi Coal Mine. The field test results showed that the soft coal in soft sub layers was mined out effectively by the directional drilling machine, the directional hydraulic jet, main boreholes, and branch boreholes under the proposed measure.
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Although the ore may be blasted to increase permeability for in situ leaching, it is not transported. The term borehole mining is used for the process where a …
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Underground mining. In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata. Access to the …
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The large diameter pressure relief borehole is one of the most effective technical means to prevent and control rockburst during deep mining. Based on the engineering background of rockburst mines, the …
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Operate mining machines that rip coal, metal and nonmetal ores, rock, stone, or sand from the mine face and load it onto conveyors or into shuttle cars. There are roughly around 3,500 of these workers found in Coal Mining. You will find these workers assisting in construction activities, checking the roof stability and cleaning equipment.
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This study aims to improve the conventional empirical rock strength estimation method that is widely adopted in the Australian coal mining industry and provide more accurate rock uniaxial ...
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For example, stratums with a thickness of 50–100 m were found to exist at 150–180 m above the roof of the coal seam in the Binchang mining area (Tingnan Coal Mine, Shaanxi Province), which ...
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Continuous improvement of coal mining technology, coal mining equipment innovation, and ground control theory and technology research related to high-intensity mining all enable an extensive application of the thick seam mining techniques in China. ... Set up the equipment for borehole drilling and grouting in place, and prepare …
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The low gas drainage efficiency of soft coal seam is a key factor that induces gas disasters, such as gas explosion and outburst, in China. This study aims to improve the gas drainage efficiency of a soft coal seam in Huainan, China, by conducting field trials with a new stimulation technique. The stimulation technique comprises two significant …
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Mount Sopris Instruments is a leading manufacturer & supplier of geophysical borehole equipment for the mining industry. Learn more about the tools we offer +1-303-279-3211 …
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Pros: Good sealing performance; Realize effective sealing in the soft coal, in which borehole is normally more likely to collapse. Cons: High costs; Complex sealing process; Need to collect the metal pipe before coal mining to avoid the coal shearer cutting metal pipe and causing mining accidents. Refer to Fig. 4.
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WebFind Borehole Mining Equipment related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Borehole Mining Equipment …
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The principles of coal mining, "drain gas before mining coal", ensure the safety of coal mining. ... SHI Zhi-jun, YAO Ning-ping, YE Gen-fei. Construction technology and equipment for gas drainage borehole drilling in underground coal mine [J]. Coal Science and Technology, 2009, 137(7): 1-4. [3] SHI Zhi-jun, HU Shao-yun, YAO Ning …
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A new study provides the first evidence of its kind that silica dust is responsible for the rising tide of severe black lung disease, including among coal miners in Appalachia. Exposure to a toxic ...
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1 Altmetric. Metrics. Abstract. The hydro-mining technology is considered as a promising method of bituminous coal excavation. The paper presents the results of the …
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PRIME MOVER TRACTORS. ROOF BOLTERS FOR COAL. ROOF BOLTERS FOR METAL/NON-METAL. SCALING MACHINES. SPECIALTY EQUIPMENT. MINING …
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The NMR system available from Mount Sopris can be used in mapping coal seam gas content and permeability for coal mining operations. BMR helps mine operators predict under what conditions coal walls may pose outburst risk. Additionally, BMR data allows operators to plan mine layout and ventilation systems in order to minimize …
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1. Borehole deviation of S-79–5-1: The construction hole depth of S-79–5-1 is 53.25 m, and the inclinometer hole depth is 53.25 m. The construction inclination is 26.8°, the downward deviation is 0.77 m, and the downward deviation is 0.52°, as shown in Fig. 11. Fig.11. S-79–5-1 Gas drainage borehole trajectory map.
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Olyphant. A half-hour north, near the town of Olyphant, a 15-acre fire in an underground coal mine vents a rotten egg smell through crevices and pipes. It has been burning for 17 years. After ...
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break blockage to dredge borehole. Abstract Draining gas from coal seams in under-ground coal mines is the main method of the coalbed methane exploitation in China. When the gas drain-age boreholes are located at soft, fractured coal rock seams, phenomena such as borehole collapse and blockage occur frequently, resulting in the signi-
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Proper rock dusting practices have proven to be an effective means of preventing coal dust explosions. Rock dust (generally pulverized limestone dust) serves as a heat sink material that prevents or suppresses a propagating coal dust explosion through the absorption of thermal energy from the heated gases and absorption of radiant energy, …
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Airflow measurements in mines. NIOSH Mining developed models to predict methane emissions at underground coal mines and the effects of various methane drainage techniques on emission rates. In …
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Location and placement of the equipment is presented in Fig. ... Borehole Mining of Coal, Uraniferous Sandston, Oil Sands, and Phosphate Ore (1971).
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inactive coal mines; and coal mining-related facilities will vary. There are a number of factors that influence to what extent significant materials from coal mines and coal mining-related facilities can affect water quality. Geographic location Hydrogeology Topography Extent of impervious surfaces (e.g., concrete or asphalt)
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China's coal seams have complex and variable endowment conditions, and mines are prone to serious gas disasters [1,2,3,4].In the process of gas management, the hole formation quality of a gas extraction borehole is an important factor in determining the efficiency of gas extraction [5,6,7,8,9].Under the influence of ground stress and mining, …
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The track roadway of the 14,301 tested working faces in the Shaqu Coal Mine was taken as an example, and the stress of the rocks surrounding the 14,301-track roadway was monitored in real time by CS-FBG borehole stress meter during the mining of the working face. The following conclusions are drawn from the fie...
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