Hydraulic fracturing emerged from the oil industry and realized its first successful commercial application in 1949 (Clark, 1949). ... the hard roof in coal mine [5][6][7] [8] [9][10]. hydraulic ...
اقرأ المزيد
This paper provides a brief introduction to hydraulic mining, describes the present system used at Strongman 2 and discusses future potential development. HYDRAULIC …
اقرأ المزيد
With the increase of coal mining depth, hydraulic supports with large mining height and high working resistance are widely used, and the length of working …
اقرأ المزيد
The Future for Coal. A fundamental re-think is needed to ensure the coal industry continues to be successful in 2030. CSIRO's Matthew Brace sums up the most recent vision for the future. If you want to create a vision for the Australian coal industry in 2030, you can, with some confidence, base it on two elements: underground and high …
اقرأ المزيد
Coal mining. extraction. automation. artificial intelligence. surface mining. longwall. room and pillar. communication system. renewable energy. 8.1.
اقرأ المزيد
hole hydraulic fracturing technique with a field tests being carried out in 3022 roadway of Daliangwan coal mine in Yulintoassessthedevelopedtechnique,equipment,andfrac-turing …
اقرأ المزيد
Successful hydraulic mining requires that the threshold nozzle pressure must be greater than the rock compressive ... 1982, Elements of Hydraulic Coal Mine Design, Trans Tech Pub, Rockport MA, 158 pp Link, J.M., 1982, Pipelining Bulk Minerals, Mining Eng., Vol. 34 No. 10, Oct, pp 1444 – 14447, 1456 . IJournals: International Journal of ...
اقرأ المزيد
In this study, a field trial was carried out involving large-scale hydraulic fracturing (LHF) to weaken strong, hard-to-cave rock strata above a longwall panel in an …
اقرأ المزيد
Increasing seam permeability by water jet is a typical example of the successful application of water jets in the field of mining engineering. The theoretical study of seam permeability enhancement by water jet is mainly focused on the mechanism of coal breaking by water jet and how gas migration occurs in a coal seam after water jet slotting ...
اقرأ المزيد
Mar 06, 2017 · It allowed small scale hydraulic mining but required a silt retention pond to prevent the damage to rivers and streams. In the past, hydraulic mining was successful because it was cheep. But these new regulations left the practice mostly unprofitable. Today, hydraulic mining is mostly relegated to use in developing countries.
اقرأ المزيد
The currently improved techniques make the hydraulic fracturing technique reliable to be used at great depth. (2) Successful in-situ stress measurement at great depth in Wanfu Coal Mine with the improved hydraulic fracturing technique has been completed. The maximum measuring depth in Wanfu Coal Mine is 1105 m.
اقرأ المزيد
Innovation plays a critical role in the mining industry as a tool to improve the efficiency of its processes, to reduce costs, but also to meet the increasing social and environmental concerns among communities and authorities. Technological progress has also been crucial to allow the exploitation of new deposits in more complex scenarios: …
اقرأ المزيد
Directional hydraulic coal mining technology mainly utilizes the combination of kilometer-oriented technology and hydraulic coal mining technology to accurately …
اقرأ المزيد
DOI: 10.1016/J.COAL.2018.06.023 Corpus ID: 134136819; Understanding mechanisms of destressing mining-induced stresses using hydraulic fracturing @article{Kang2018UnderstandingMO, title={Understanding mechanisms of destressing mining-induced stresses using hydraulic fracturing}, author={Hongpu Kang and …
اقرأ المزيد
Roof strata control is crucial to production safety in underground coal mines. In this study, a field trial was carried out involving large-scale hydraulic fracturing (LHF) to weaken strong, hard-to-cave rock strata above a longwall panel in an underground coal mine. Comprehensive monitoring was performed to monitor the generated hydraulic …
اقرأ المزيد
Nevertheless, a detailed characterization of hydraulic parameters is crucial for the successful applications of these engineering measures as well as for the safe mining. Due to the presence of fractures, faults, and karst conduits, limestone aquifers are highly heterogeneous and hydrological characterization of limestone aquifers are ...
اقرأ المزيد
The successful application of the backfilling hydraulic support in the Tangshan mine showed the rationality of the reform design. Discover the world's research 25+ million members
اقرأ المزيد
With the increase of coal mining depth, hydraulic supports with large mining height and high working resistance are widely used, and the length of working face and the number of supports are ...
اقرأ المزيد
Based on the success of the Phase I test, El Paso also leached part of the ore in the pit bottom. ... Further development of this concept to test a full-scale hydraulic borehole coal mining system is planned under the Advanced Mining Systems subprogram and will most likely be accomplished through the formal request for proposal route.
اقرأ المزيد
iv. Hydraulic mining 3. stThe 21 Century era (year 2000 and beyond) i. Bord and system base ii. Longwall system base 2.1 The Pre-nationalisation era of the Indian coal mining history can be conveniently classified further into two bases namely: Bord And Pillar Base and Longwall System Base. The National Coal Development Corporation (NCDC) was ...
اقرأ المزيد
Coal resources distribution and subsidence related surface damage characteristics.Proven coal reserves are estimated as 1.53 trillion mt as of 2015 and rank third in the world (Xiao et al. 2014a, b).Their distribution is shown in Fig. 1.The degree of subsidence-related damage in different mining regions varies due to the geological and …
اقرأ المزيد
Hydraulic mining with very soft coal reserve, extraction with high pressure jet monitor has been and tried and found successful in some cases. But, here we are examining extraction by Longwall Shearer or Continuous Miner, transportation by hydraulic pumps.
اقرأ المزيد
@article{osti_6417179, title = {Hydraulic mining studies of Storm King Mines}, author = {Arentz, S S}, abstractNote = {Although the United States coal industry is slow to accept hydraulic mining, continued expansion is taking place in Russia, China, India, and Canada. With strip ratios constantly expanding on surface mines, the cost effectiveness …
اقرأ المزيد
In a reliability assessment of hydraulic fracturing, the efficacy of hydraulic fracturing must be evaluated, and the source properties and magnitude of micro-earthquakes induced by hydraulic fracturing in a coal mine need to be quantified. Firstly, the changing trends of the number and energy of micro-seismic events induced by …
اقرأ المزيد
1. Introduction. With the increase of the mining depth and mining intensity, the coal mining industry is entering an era of confronting with severe dynamic disasters due to the high static stress and severe perturbance stress [1].Coal burst is a dynamic disaster induced by elastic strain energy emitted in a sudden, rapid and violent way from …
اقرأ المزيد
Hydraulic fracturing has long been applied in the petroleum industry, and it has also been successfully used in the coal mining applications, such as coal seam methane drainage, top-coal degradation, and pressure relief by roof cutting.
اقرأ المزيد
In order to mitigate the risk of roof-dominated coal burst in underground coal mining, horizontal long borehole staged hydraulic fracturing technology has been prevailingly employed to facilitate the weakening treatment of the hard roof in advance. Such weakening effect, however, can hardly be evaluated, which leads to a lack of a …
اقرأ المزيد
In the process of coal mining, the remaining coal pillars in the overlying strata have a greater impact on the lower mining pressure. Hydraulic fracture can provide a strong control effect, but ...
اقرأ المزيد
In Australia so-called "hydraulic mining" was used in open pit mining 16 with hydro-monitors of mining effectiveness at the level of 500 Mg/h and water pressure from 1.0 to max. 4.0 MPa ...
اقرأ المزيد
NZ underground goes hydraulic. Staff Reporter. 19 June 2000. Two new underground coal mining projects on the West Coast of New Zealand's South Island may serve as a catalyst to lift the country's export coal trade from current levels of around 1.5 million tonne per annum to over 3 Mtpa. The Pike River coalfield development and the …
اقرأ المزيد