Concept of Hydraulic Mining | Download Scientific …
However, application of hydraulic mining for thick coal seams in New Zealand has shown good results [7, 36] but for a scanty band width of the geomining conditions. This approach offered ...
Hydraulic support and coal wall coupling relationship in …
【Abstract】In terms of occurrence conditions of the hard and thick coal seam in Jinjitan coal mine, the 8.2 m ultra large height longwall mining method was proposed, and the …
The Effect of Hydraulic Coupling on Mechanical …
During coal mining, the mechanical and deformation behavior of the overburden is affected by water and stress. Therefore, it is of great significance to study the mechanical behavior of the surrounding rock under the action of hydraulic coupling. For high-intensity mining with shallow coal seam and large mining and strong strata behavior …
Potential hydraulic connectivity of coal mine aquifers …
Mining activities interfere with the natural groundwater chemical environment, which may lead to hydrogeochemical changes of aquifers and mine water inrush disasters. This study analyzed the hydrochemical compositions of 80 water samples in three aquifers and developed a water source identification model to explore the control …
The Effect of Hydraulic Coupling on Mechanical …
2.2. Characteristics of Mining pressure on Working Face. As shown in Figure 2(a), according to the thickness of the 1-2 seam in Shangwan coal mine, the mining height is 8.8 m, the hydraulic support is selected as ZY29000/43/92D, the support height is 9.2 m, and the minimum support height is 4.3 m.As shown in Figure 2(b), the spatial …
Effect of Strain-Dependent Hydraulic Conductivity of Coal …
Hydraulic conductivity is an important parameter for predicting groundwater inrush in coal mining worksites. Hydraulic conductivity varies with deformation and failure of rocks induced by mining. Understanding the evolution pattern of hydraulic conductivity during mining is important for accurately predicting groundwater inrush. In …
Hydraulic coal mining
The earliest attempts at hydraulic mining involved transporting coal from the mine mouth to the nearest road or rail transport. For example, in 1924 a flume (water race used for carrying coal) was constructed from the mouth of the Cardiff Bridge mine to the railway at Seddonville, a distance of 1.6 km.
Hydraulic mining of coal | Semantic Scholar
Hydraulic mining of coal @inproceedings{Parkes1975HydraulicMO, title={Hydraulic mining of coal}, author={D. M. Parkes and Allan Grimley}, year={1975} } D. Parkes, Allan …
Potential hydraulic connectivity of coal mine aquifers …
The Qianyingzi coal mine is located in the middle of the Huaibei Plain and southwest of Suzhou City, within a longitude belt of 116°51′E−117°E and a latitude belt of …
Hydraulic mining – Coal and coal mining – Te Ara …
Hydraulic mining. This diagram shows how water was used in hydraulic mining. Safety considerations and the drive to obtain as much coal as possible from an area led to the progressive replacement of underground mining by opencast mines. Underground mining in New Zealand was also revolutionised by the use of high-pressure water jets to extract ...
Hydraulic mining | Britannica
hydraulic mining, use of a powerful jet of water to dislodge minerals present in unconsolidated material, including mine tailings, placer deposits, alluvium, laterites (soil …
Hydraulic mining of coal (Journal Article) | OSTI.GOV
The U.S. Department of Energy's Office of Scientific and Technical Information
Introduction to the Special Issue "Rock Mechanics …
The mining advance rate influences the phenomenon. The induced ground deformations can trigger landslides as is the case in Southwestern China. In relation to this, Tang et al. present a theoretical model to predict fracture development in a bedded rock slope following underground coal mining. The results of a physical model in the laboratory ...
Hydraulic mining – Coal and coal mining – Te Ara …
Hydraulic mining. This diagram shows how water was used in hydraulic mining. Safety considerations and the drive to obtain as much coal as possible from an area led to the …
(PDF) Hydraulic conductivity of coal mine tailings
Extensive factory and field testing of the hydraulic borehole coal mining tool was performed. The tests: (1) characterized cutting nozzle and crusher wear and reliability; (2) characterized ...
University of Wollongong Research Online
G. J. Duncan, Hydraulic coal mining developments in New Zealand, in Naj Aziz and Bob Kininmonth (eds.), Proceedings of the 1998 Coal Operators' Conference, Mining Engineering, University of Wollongong, 18-20 February 2019 https://ro.uow.edu.au/coal/237 Research Online is the open access institutional …
Continuous three-dimensional stress monitoring in roof of …
The occurrence of rockburst in coal mines is closely related to the stress in coal and rock mass. Through hydraulic fracturing measurements in roof, the three-dimensional stress in roof before and after hydraulic fracturing as well as during working face advancing was monitored, and the effect of hydraulic fracturing in roof on controlling …
Application of Acoustic Emission Technique to the …
Hydraulic flushing has the advantages of reducing coal stress and improving coal seam permeability, so it is widely used in high gas outburst coal seams in China. However, the effect evaluation of stress relief and permeability enhancement will be necessary before coal mining. In this paper, an acoustic emission (AE) experiment …
Underground mining slurry transportation viability
Underground mining requires lot of water pumping to surface which increases cost. Because of safety, support, ventilation and environment costs …
University of Wollongong Research Online
G. J. Duncan, Hydraulic coal mining developments in New Zealand, in Naj Aziz and Bob Kininmonth (eds.), Proceedings of the 1998 Coal Operators' …
Hydraulic coal mining
The earliest attempts at hydraulic mining involved transporting coal from the mine mouth to the nearest road or rail transport. For example, in 1924 a flume (water race used for …
Research on One Borehole Hydraulic Coal Mining System
The ideal jet of the monitor in the borehole hydraulic coal-mining system is a nonsubmergible free jet. Through air lift, the nonsubmergible free jet can be set up in the mining hole. References [1] Dibble M F. Borehole mining: improved technology expands horizon. Mining Engineering, 1991, 290(3): 313–318. [2]
Research on Application of Hydraulic Fracturing Enhanced …
Coal/gas outburst is a strong dynamic process in underground gas-bearing coal and rock mass which moves rapidly from coal seam to mining site in the form of crushing and pulverizing accompanied by a large amount of gas emission; it would seriously threaten the safety of Coal Mine production (Yan et al. 2013).The main factor restricting …
Hydraulic support and coal wall coupling relationship in …
【Abstract】In terms of occurrence conditions of the hard and thick coal seam in Jinjitan coal mine, the 8.2 m ultra large height longwall mining method was proposed, and the strength, stiffness and stability coupling relationship between the hydraulic support and wall rock in the ultra large height longwall mining face were analyzed. ...
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