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Hydraulic Borehole Mining Conference Ostigov Extensive factory and fieldtestingof thehydraulic borehole coal miningtool was performed the tests 1 characterized cutting nozzle and crusher wear and reliability 2 characterized cutting cavity slurry flow crushing and slurry pumping processes under field conditions and 3 compared laboratory cutting and pumping rates with those obtained in the field Study On Borehole Arrangement Methods For Gas Extraction The extraction simulation optimization analysis has been carried out on the arrangement ofborehole spacingand slot spacing arrangement in this method and the results that have been obtained are the following the optimalborehole arrangementspacing is 285 m and the optimal slot arrangement spacing is 31 m 3 the efficiency of gas extraction of the method of networked slotting in longdistance Hydraulic Borehole Mining System Patent Ostigov Extensive factory and fieldtestingof thehydraulic borehole coal miningtool was performed the tests 1 characterized cutting nozzle and crusher wear and reliability 2 characterized cutting cavity slurry flow crushing and slurry pumping processes under field conditions and 3 compared laboratory cutting and pumping rates with those obtained in the field Borehole Mining Kinley Exploration Kinley Exploration Borehole miningno longer a science projectborehole miningis proving itself as a workable technology that can be applied to a number of industries hydraulically jetcutting a cavern of rock 20 feet in diameter from a drilledbore holeallows thissystemto recover resources previously uneconomical for open pit or undergroundminingoperations
Crossborehole Hydraulic Slotting Technique For Preventing Sep 01 2015 considering thecoaland gas outburst disasters that occur while excavatingcoalroadways inahighgas lowpermeability singlecoalseam we propose the application ofa crossborehole hydraulicslotting technique to increase the permeability ofa coalseam Aroadheaderassisted Coal Cutterbased On Tensile Failure 31 the column model as shown in figure 1b thecoalsidewall is conceptualized as a column withoneend fixed and the other end hingedin the axial direction we have in order to obtain the deflection of the column the coordinatesystemshown in figure 1b is used to describe the problem the axis is in the axial compression column and vertical downward is the positive direction Experimentalresearchon The Performances Of Water Jet Jun 20 2018 in the beginning of 20th century the united states carried out the research on borehole hydraulic mining technology and successfully carried out the mining of uranium deposits asphaltene sand granular phosphorite and sandstone which was subsequently applied in production practice in russia yugoslavia and other countries 1116 in the world many countries have successfully used Study Onboreholearrangement Methods For Gas Extraction 41 reasonable slot spacing in the same alongseamborehole figure 2 is a nephogram of gas distribution incoalmatrix under different slot spacing after 15day extraction it can be seen from figure 2 that under the influence of negative pressure of extraction from the slottedborehole the closer to the slottedborehole the faster the gas pressure in thecoalseam decreased
Rationalboreholesarrangement Of Gas Extraction From In order to enhancegas extraction from unloaded coal seamby drillingboreholein the floor roadway the mechanism of stress relief improving permeability by protectivecoalseamminingwas analyzed based on the multiphysics field theory thehydraulicmechanical coupling model of gas extraction in the unloadingcoalseam was established and the gas extraction process by drillingborehole Application Of Crossing Borehole Hydraulic Fracturing In In order to solve technical problems which restrictedcoal miningoperation such as low penetrability ofcoalmass and low efficiency of gas extraction according to geologicalminingcondition of yuyang mine crossingborehole hydraulicfracturingsystemwas designed and investigated in n3704 west gas tunnel below thesystemwas based oncoalor rock masshydraulicfracturing theory and Cdc Mining Effects Ofhydraulicstimulation On In studies conducted by the bureau of mines two test areas were hydraulically stimulated and exposed byminingonein the pittsburgh coalbed at the vesta no 5 mine washington county pennsylvania andonein the illinois no 6 coalbed at the inland mine jefferson county illinois Professor Phd Researchgate Find And Shareresearch Insufficient breaking and falling of topcoalis a technical problem in hard thick or superthickcoalseams during topcoal mining based on topcoalweakening byhydraulicfracturing and main
Strata Behavior At Fullymechanized Coal Miningand Solid Sep 20 2016 taking ping dingshancoalmine group 12 as an example this paper explains thesystemlayout key equipment and backfilling technology in detail it probes into the characteristic of rock strata movement behavior and surface deformation above the gob area through insite measurement method the results show that as the overburden strata are effectively supported by the backfill body in mined Energies Free Fulltext Combination Of Prepulse And The weakening of hardcoalrock mass is the core common problem that is involved in the topcoalweakening in hard and thickcoalseams the hard roof control during the initialminingstage in the longwallminingface and the hanging roof control in the gob of noncoalmine based on the characteristics of pulsehydraulicfracturing and constant pumping ratehydraulicfracturing a Undergroundcoal Miningtechnology Coal Mining The Hydraulic miningofcoalby large highvolume monitors has been practiced in thick steeply dipping seams in western canada but thesystemhas not presently been used in the united states it is possible that thick seams too deep for surfaceminingmay be mined by Read "coal Mining" At Napedu The National Academies Press In the advancedminingsystems area new and improved methods ofminingthick thin and multiplecoalseams are being investigated emphasis is on advanced concepts and techniques such ashydraulic miningand automated andborehole miningthat would allowcoalrecovery without the presence of the miners underground
Application Of Crossing Borehole Hydraulic Fracturing In In order to solve technical problems which restrictedcoal miningoperation such as low penetrability ofcoalmass and low efficiency of gas extraction according to geologicalminingcondition of yuyang mine crossingborehole hydraulicfracturingsystemwas designed and investigated in n3704 west gas tunnel below thesystemwas based oncoalor rock masshydraulicfracturing theory and Theresearchon Characteristics Ofhydraulic Support Jan 18 2018 it provides a newresearchidea and method for the study of the overall stability and effectively reduces the failure rate of electrohydrauliccontrolsystemof thehydraulic support it also plays practical significance and value to improve theminingefficiency of thecoal miningface Researchon Nonpillarcoal Miningfor Thick And Hard 1 day ago this article introduces a new nonpillarcoal miningtechnology ie gobside entry retaining by roof cutting gerrc under the condition of thick and hard roofs first we theoretically analyzed the solution to the large suspension span of the thick and hard roof incoal mining threezone presplit blasting design in nonpillarcoal miningfor thick and hard roofs was proposed based on Theresearch On Coal Mining Environmentalpdf The Theresearch on coal mining environmentalimpact post assessment mai fangdai wangsuiquanqin hongzheng zhangwei sinocoalinternational engineering design andresearchinstitute beijing huayu engineering co ltd beijing100120china abstract the environmental impact post assessment is a further extension and improvement on the basis of environmental impact assessment
The Design And Analysis Of A New Slippertypehydraulic Aug 17 2018 introductionhydraulicsupports 110 are important equipment in mechanizedcoal miningsystems it mainly supports the working face in the mine cooperating with the shearer and scraper the stability and reliability of ahydraulicsupport plays an important role to not only guarantee the safe operation of thecoalmine but also to improve the mines efficiency and economic Energies Free Fulltext Experimental Study Of Crack Highpressurehydraulicfracturing technology incoalandcoalbed methane mines can lead to roof and floor damage and fracture initiation disorder that leads to a blank area and other issues a new method ofhydraulicfracturing is proposed to increase the homogeneous permeability ofcoalin underground coalmines numerical and other simulation tests for different forms of a treetype Research Progress Of Monitoring Forecasting And Nov 11 2014 asoneof the dynamic disasters ofcoalmines rockburst seriously affects underground safecoal mining based on the laboratory test field test and theoretical analysis this study proposed the principle of the rock burst induced by the combination of dynamic and static stresses and divided such rock burst into three types including induced by primary dynamic stress mainly induced by