Controlling coal mine floor heave: an overview



Publisher: U.S. Dept. of the Interior in Washington

Written in English
Published: Pages: 17 Downloads: 648
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Subjects:

  • Rock mechanics,
  • Coal mines and mining

Edition Notes

11

The Physical Object
Pagination17 p.
Number of Pages17
ID Numbers
Open LibraryOL22019871M

coal mines ground movements such as roof convergence and floor heave are inevit­ able, and supplemental roof supports (timbers and cribs) should be installed at the site. 2. The bulkhead, in most cases, should be designed to withstand the maximum hy­ drostatic pressure that can develop. Coal Mine Inspector Tom Meredith Coal Mine Inspector machine sections develop a maximum of six entries and use various size pillars to control strata subsidence and floor heave. Coal is transported by belt conveyor to the production shaft and hoisted by skips to the surface. A review of the weekly examination record book and information. Blevins, C.T., and Dopp, D., , Ground control experiences in a high horizontal stress field at the Inland Steel Coal Mine No. 2: Morgantown, University of West Virginia, Fourth Conference on Ground Control in Mining, Proceedings, p. – The study site is the Petersburg Mine, an underground limestone mine owned by East Fairfield Coal Company, located in eastern Ohio in Mahoning County. The mining horizon is generally from 60 to 75 m below the surface. The mine is developed from a box cut, with portals into the Vanport limestone seam with slightly less than 45 m of overburden.

  Contributions are included on roof bolting, wooden cribs, entry support design, shield support monitoring and analysis, overburden movement and face moves in longwall mining, mine design in complex geological conditions, stiff and yield pillar design, rock and coal seam properties, mechanisms of floor heave and determination of floor bearing. (E), of the Coal Mine Safety Laws of Virginia for failure of the mine operator to comply with the Emergency Response Plan, Section I (No. 2). The DM was not contacted promptly (within fifteen minutes) after it had been determined that an accident, as defined by the Coal Mine Safety Laws of Virginia, Section , had occurred. ^-develop. This is usually equal to the coal mines ground movements such as roof depth of the bulkhead below the surface. convergence and floor heave are inevit-Emergency.—Bulkheads constructed under able, and supplemental roof supports emergency conditions to seal off unex- (timbers and cribs) should be installed pected inrushes of water. View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: coal mining machine, truck, and track jack. Pyrene Manufacturing Company, New York; fire extinguishers.

Signal Peak Energy’s Bull Mountains mine No. 1, located 30 miles north of Billings, Montana, USA, mines bituminous coal from the ft-high Mammoth coal seam. Longwall recovery history was made here in late January by successfully mining into and recovering the longwall in a ft-wide predeveloped full-face recovery entry.   An MSHA coal mine inspector was conducting an E01 inspection at the mine when the accident occurred and was immediately notified of the accident. At approimately p.m. on Thursday, , Tim Thompson, Manager of Safety at the Oak Grove Mine, contacted the MSHA District 11 Office and reported a serious accident that could result in a. - West Virginia Miner's. See more ideas about west virginia, virginia, coal pins. The threatening coal strike Summary Five miners ascending a mine shaft in cage, Kingston Coal Co., Pennsylvania. - Coal mining--Pennsylvania Library of Congress Control Number Reproduction Number LC-USZ (b&w film copy neg.).

Controlling coal mine floor heave: an overview Download PDF EPUB FB2

This US Bureau of Mines report presents an overview of ground control considerations associated with floor heave. Factors affecting heave, such as in situ stress, floor characteristics, and mine geometry, are described.

Floor-displacement monitoring and data analysis methods are outlined. Finally, floor heave remediation is discussed. Additional Physical Format: Online version: Wuest, William J.

Controlling coal mine floor heave (OCoLC) Material Type: Government publication, National government publication. Get this from a library. Controlling coal mine floor heave: an overview.

[William J Wuest; United States. Bureau of Mines.]. This U.S. Bureau of Mines report presents an overview of ground control considerations associated with floor heave. Factors affecting heave, such as in situ stress, floor characteristics, and mine geometry, are described. Floor-displacement monitoring and data analysis methods are outlined.

Finally, floor heave remediation is discussed. Controlling coal mine floor heave: an overview / By William J. Wuest. Abstract. Includes bibliographical references (page 17).Mode of access: Internet Topics: Rock mechanics., Ground control (Mining), Coal mines and Author: William J.

Wuest. This paper presents an overview of the Controlling coal mine floor heave: an overview book heave management at the Glencore Bulga Underground Operations and investigates the contributing factors to the behaviour of the floor.

The mine experienced a number of major floor heave events in gateroads on development. A West Kentucky mine operation in No.

11 seam encountered floor heave, due to the localized increase in the thickness of the fireclay mine floor. Floor heave has overridden seals installed in two. An important problem in the coal mining industry today is the control of newly exposed roof and floor in working places.

It has been established that the apparently simple phenomenon of floor lift. I first read Storming Heaven when it came out 30 years ago. I thought I’d re-read it given the attention coal mining is getting currently and the fact that people still don’t know how the coal companies stole the land in WV and KY and about the harsh treatment of miners and their families before s: Some aspects of subsidence caused by longwall coal mining are analysed using the finite element method.

Results of the analysis are compared with a true mine panel, where measurements on subsidence were available. Rock deformations in the overburden were modelled by using an elasto-plastic constitutive model.

The study indicates that the shape of the subsidence profile can be. Wuest, W.J.,Controlling coal mine floor heave: An overview: U.S. Bureau of Mines Information Circular17 p. Back to "Coal Mining Geology" Mining and Mineral Resources Building, University of Kentucky, Lexington, KY   Floor heave is a dynamic phenomenon that often occurs in a coal mine roadway.

This can cause the roadway to narrow and hinder transport, ventilation, and walking through it. Finally the roadway may have to be abandoned, seriously affecting coal production safety. The continuous miner sections develop a maximum of six entries and use various size pillars to control strata subsidence and floor heave.

The last MSHA regular health and safety inspection was completed on J and an MSHA health and safety inspection which began on July 5, was in progress at the time of the accident. Compared with shallow roads, deep roadway floor heave is more common and severe, which has become an urgent problem for deep mining.

This effect not only causes great difficulty in controlling the rock surrounding the roadway but also seriously threatens the safety of the coal mine.

In-mine measurement indicates that the magnitude of floor heave in the gateroads may reach up to – mm, depending on the geological and mining conditions [2,16]. Severe floor heave significantly reduces the accessibility of the entries and, in some cases, causes longwall panels to.

@article{osti_, title = {Coal mine floor heave in the Beckley coalbed, an analysis. Report of investigations }, author = {Aggson, J.R.}, abstractNote = {The floor heave ground control problems that have been encountered in a new underground coal mine in West Virginia are described.

Previous experience in the coal seam, the results of physical property investigations, and in situ. Roadway Maintenance. Whether rail or free steered transport is used, the importance of roadway maintenance cannot be stressed enough.

Provided there is no floor heave, maintenance of rail is somewhat simpler and entails ensuring clearance is adequate at all times, the trackwork is securely held on the sleepers and fishplates at rail joins are tight (some mines use welded joints, often using a.

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Full text of "In situ strength characteristics of coal mine floor strata in Illinois". The proposed floor heave control strategy achieved good results, and as the deformation of the floor heave decreased, the workload of the floor heave was also greatly reduced.

This study considered the mining roadway with coal pillar protection in the fully mechanized caving face of the Dananhu No.1 Coal Mine. Below the coal seam an upward component of force also acts toward the center of the void. As the cavity increases in size, fractures develop in the overburden which may result in subsidence of the surface and sometimes heaving of the mine floor.

Figure Pit subsidence. (From Elbert, J. and L. Guernsey. Although the protective coal pillar is left, the floor heave is still the most serious problem in roadway deformation. At present, generally, the methods of undercutting the floor, reinforcement, or pressure relief are used to control the floor heave [10–12].

Stress/Strata Control Along the Longwall Face. Along the face, the roof control function is a matter of providing sufficient resistance to control the dead load of the mass of strata which is breaking, or has broken, away from the bulk of the overlying strata.

from the Illinois coal basin. Illinois coal bearing strata creates unique and challenging mining conditions and unique subsidence conditions.

The immediate floor is often a weak clay-rich rock (underclay or fireclay) and of a highly variable thickness. Pillar punching and floor heave can be highly variable and unpredictable. A paper is available. The floor heave was exacerbated by the presence of floor coal, which buckled upward near the center of the beltline.

Roof movement was occasionally aggravated by laminated roof conditions, but was kept in check by aggressive supplemental support. The demand for increased productivity and the problems associated with mining at greater depths have increased the interest in using the yield pillar concept in the United States.

This paper summarizes chain pillar behaviour in a mine that historically experienced coal bumps in both room-and-pillar and longwall sections.

Results indicate that, generally, the chain pillars yield as designed. The bottom coal was further fractured and dispersed under the action of tension, shear, and extrusion in the process of floor heave. Based on the floor heave induced by the narrow coal pillar, a recovery technique of the bottom coal with thick coal seams in the gob-side entry was developed.

Control of mine floor heave depends on the cause and type of floor heave. Wuest (9) describes physical characteristics and mining conditions that contribute to floor heave, as well as procedures for control of heave.

The latter include methods of mine maintenance, supplemental support, and mine design and layout. 6 ‘Floor heave’ can occur if upward pressures from aquifers below the mine floor exceed the remaining weight of coal and sediments above the aquifer.

Floor heave in the Latrobe Valley coal mines is prevented by pumping large quantities of groundwater out of the aquifers (termed ‘aquifer depressurisation’). 7 Pumping large quantities of. Floor Heave Control Outby the Seal Line in No. 11 West Kentu Underground Measurement of Gateroad Stability at the Depth A Multiple–seam mining in the United States: An Analysis of Mu Analysis of Roof and Pillar Failure Associated with Weak Flo A Case Study of Multi–Seam Coal Mine Entry Stability Analysi.

ISBN: 39th International Conference on Ground Control in Mining (ICGCM ) Canonsburg, Pennsylvania, USA 28 - 30 July. Chapter 1: Mine Ventilation – An Overview Page 2 Revolution, the working of seams rich in methane gas, inadequate ventilation, furnaces located in methane-laden return air and the open flames of candles.

There are many graphic descriptions of methane and coal dust explosions, the suffering of mining communities, the heroism of rescue at.Detection and control of spontaneous heating in coal mine pillars - a case study. Published Date: Series: "Coal mines that undergo self-heatings, and specifically mines that sustain both floor heave and self-heatings, would benefit from the use of sealants to minimize air ingress to susceptible areas.

The U.S. Bureau of Mines (USBM.Hossein Masoumi graduated from Tehran University, Iran with Bachelor of Science degree in Mining Engineering in and completed the level of Master of Mining Engineering, major in Mine Management and Mine Geomechanics in at the School of Mining Engineering, UNSW.