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Saturday, May 2, 2020 | History

2 edition of Interactions between multiple seam longwall and room-and-pillar operations found in the catalog.

Interactions between multiple seam longwall and room-and-pillar operations

G. J. Chekan

Interactions between multiple seam longwall and room-and-pillar operations

a cse study in Boone County, WV

by G. J. Chekan

  • 66 Want to read
  • 14 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Pgh [Pittsburgh], PA .
Written in English

    Places:
  • West Virginia,
  • Boone County.
    • Subjects:
    • Ground control (Mining) -- Case studies.,
    • Ground control (Mining) -- West Virginia -- Boone County.,
    • Pillaring (Mining) -- Environmental aspects -- West Virginia -- Boone County.,
    • Longwall mining -- Environmental aspects -- West Virginia -- Boone County.

    • Edition Notes

      Includes bibliographical references (p. 13-14).

      Statementby Gregory J. Chekan and Rudy J. Matetic.
      SeriesReport of investigations / Bureau of Mines, United States Department of the Interior ;, 9299, Report of investigations (United States. Bureau of Mines) ;, 9299.
      ContributionsMatetic, Rudy J.
      Classifications
      LC ClassificationsTN23 .U43 no. 9299, TN288 .U43 no. 9299
      The Physical Object
      Pagination14 p. :
      Number of Pages14
      ID Numbers
      Open LibraryOL1811381M
      LC Control Number89600352

      Process mining is the missing link between model-based process analysis and data-oriented analysis techniques. Through concrete data sets and easy to use software the course provides data science knowledge that can be applied directly to analyze and improve processes in a variety of domains.


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Interactions between multiple seam longwall and room-and-pillar operations by G. J. Chekan Download PDF EPUB FB2

Get this from a library. Interactions between multiple seam longwall and room-and-pillar operations: a case study in Boone County, WV. [G J Chekan; Rudy J Matetic]. NIOSHTIC-2 Publications Search. Interactions Between Multiple Seam Longwall and Room-and-pillar Operations--a Case Study in Boone County, WV.

mine planning, and development, the U.S. Bureau of Mines is investigating the effects of multiple seam interactions associated with longwall coal mining. Field investigations were conducted at a.

Headgate pillars and entries were instrumented and monitored to study their behavior during side-abutment loading as the longwall panel approached and passed beneath the overlying room-and-pillar developments. The two operations are separated by ft of interburden, and although interactions between operations separated by this distance are uncommon, geomechanical measurements indicate the occurrence of an interaction.

Harris has experienced numerous interactions associated with the extensive room-and-pillar and longwall mining operations which have been conducted in the overlying No.

2 Gas Coalbed. The problems have included roof falls, excessive rib sloughage, and gateroad and bleeder entry closure. The prevalence of full extraction adds greatly to the potential for multiple seam interactions.

The Western U.S. is the next most significant area for multiple seam mining. Here, in the states of UT, CO, WY, and NM, nearly 95% of underground production comes from 13 longwall operations (DOE-EIA, ; Fiscor, ).

Abstract This paper presents an investigation on the interactions of overburden failure zones induced by the mining of adjacent coal seams using the longwall caving method. Overburden failure is an important factor in safety assessments in the fields of mining engineering geology and safety geology, especially when mining under water bodies.

The study of seam interaction is crucial for developing multiple seams longwall mining especially when it comes to weak rock conditions which are usually found in most of the coal reserves in. Forrest also studied the use of yield pillars for controlling multiple-seam longwall interactions.

Using photo-elastic models, he showed that yield pillars can reduce. shear stress in the roof and floor of the lower seam better than conventional pillar designs can.

Mining Science and Technology, 9 () Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands 57 Evaluation of success probability in multiple seam room-and-pillar mining E.C.K. CHANDA Department of Mining Engineering, University of Zambia School of Mines, P.O.

BoxLusaka (Zambia) (Received October 6, ; revised and accepted January 9, ) Abstract Chanda Cited by: 3. PDF | The objective of the research is choosing and finding rational parameters of preparation and development of multiple seams of coal under the | Find, read and cite all the research you.

The Harris No. 1 Mine, located in Boone County, WV, has been longwalling the Eagle Coalbed for over 30 years. Harris has experienced numerous interactions associated with the extensive room-and-pillar and longwall mining operations which have been co Author: Thomas M. Barczak, Frank E.

Chase, John A. Organiscak. Coal deposition is usually in the form of multiple seams with different interburden thicknesses and geologies. Much research on the interactions of strata stress and deformation due to multiple seam mining have been carried out for room-and-pillar and longwall panels since the s (Mark ; Mark et by: Longwall and/or room-and-pillar mining operations in multiple coal seams may not only induce subsurface and surface subsidence but also cause interactions between these mined coal seams.

Headgate pillars and entries were instrumented and monitored to study their behavior during side-abutment loading as the longwall panel approached and passed beneath the overlying room-and-pillar developments.

The two operations are separated by ft of interburden, and although interactions between operations separated by this distance are uncommon, geomechanical measurements. Tabas coal mine (Parvadeh-I), with a total geological reserve of 98 Mt is located about 65 km south east of the city of Tabas, Yazd province, Iran.

Seam C with an average dip of 22° and an average thickness of 2 m is the main workable seam in this mine. Room and pillar and mechanized longwall Cited by: LONGWALL MINING Overview.

In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range to m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face.

In room and pillar mining, pillar extraction can be so designed that mined out area is submerged in water. This provides excellent inertization but is possible only in highly inclined coal seams. Most commonly, self-inertization is provided by the methane gas released from coal seams in the gas emission space.

Multiple seaminteractionsinvolving longwall operations have been documented in various case and model studies ().2 There are a variety of geologic and engineering design parameters that influence interactive distance, magnitude, and location.

Researchers have demonstrated the importance of geology in seam interaction (1). Over­Author: G. Chekan, Rudy J. Matetic. Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically – m (2 ft 0 in–3 ft 3 in) thick).

The longwall panel (the block of coal that is being mined) is typically 3–4 km (– mi) long and – m (–1, ft) wide. Early multiple seam mining took place at the Deseret, Beehive and Little Dove mines utilizing room and pillar methods.

In the late 70`s and early 80`s longwall mining was introduced at the Deer Creek and Wilberg-Cottonwood Mines and multiple seam mining, using. This report investigates four case studies involving interactions between operations that used both room-and-pillar and longwall mining methods.

In each case, geologic and mine design parameters are addressed, and those parameters found critical to the interaction are further defined in relation to observed ground problems.

Analysis and design considerations for superimposed longwall gate roads [microform] / by Gregory J. Chek Effects of abandoned multiple seam workings on a longwall in Virginia [microform] / by Gregory J. Cheka Interactions between multiple seam longwall and room-and-pillar operations [microform]: a case study in.

Longwall mines produce more than 30 pct of all underground coal, up from 5 pct just 15 years ago. The continued growth of longwall mining without appropriate multiple-seam planning may increase the cost and risk of mining.

Optimization of the mine design factors is arguably the primary means for controlling interactions between operations. The simultaneous mining of two or more coalbeds may cause instability between room-and-pillar operations, resulting in an interaction known as pillar load transfer.

Although pillars may be adequately designed for single-seam mining, the development of a second seam may complicate loading conditions in both by: 5. Multiple-seam mining in the United States. Design based on case histories (pp.

15–27). Paper presented at the symposium on new technology for ground control in multiple-seam mining. NIOSH. Google ScholarAuthor: J. Galvin.

Pramod Thakur Ph.D., in Advanced Mine Ventilation, Abstract. Longwall mining or coal pillar extraction by any other method causes the roof to subside and the floor to heave. The “gas emission space” created by such coal extraction can extend ft above and ft below the working seam depending on the width of the panel.

Any coal seam contained in the gas emission space will. PROCEEDINGS: NEW TECHNOLOGY FOR GROUND CONTROL IN MULTIPLE-SEAM MINING Edited by Christopher Mark, Ph.D., P.E.,1 and Robert J.

Tuchman2 ABSTRACT Multiple-seam interactions are a major ground control hazard in many U.S. underground coal mines. Relationship between joint movement and mining subsidence ), the interaction between coal seams worked at different levels, variations in the topography and eighteenth and nineteenth centuries, was the room and pillar form of mining, where galleries (rooms) wereCited by: The Power of Longwall Pillar Design.

Ten years ago, “trial and error” was the only “method” available for sizing longwall pillars. As many mines first introduced longwalls, they first tried pillar dimensions that had been successful in their previous room-and-pillar developments. @article{osti_, title = {Continuous miners vs.

longwalls}, author = {Nilsson, D and Reddy, N A}, abstractNote = {This article argues that higher coal recovery and greater net present capital values (NPCV) makes longwall mining more profitable than continuous mining over a longer period.

Compares longwall mining with continuous room-and-pillar mining of a 6-ft coalbed covering almost. Strata interactions in multiple-seam mining--two case studies in Pennsylvania / (Pittsburgh, Pa.: U.S. Dept. of the Interior, Bureau of Mines, ), by G. Chekan, James A. Galek, and Rudy J. Matetic (page images at HathiTrust) More items available under narrower terms.

efficient than room-and-pillar mining, it is being promoted increasingly in the United States. Also, longwall mining induces a generally uniform and contemporaneous surface subsidence that can be Technical terms used herein are defined in the glossary, p.

more accurately forecast than subsidence caused by room-and-pillar by: Compare and contrast longwall advancing and retreating methods of coal mining. Question 13 Explain with the aid of sketches the interaction between the powered supports, the AFC and the power loader on a longwall coal face. Question 14 Describe in detail one method of pillar extraction in room and pillar mining.

Question @article{osti_, title = {Multi seam mining in the west}, author = {Moon, M R}, abstractNote = {Energy West Mining Company operates two mines in central Utah that supply coal for the PacifiCorp thermal power plants in Carbon and Emery Counties.

During the past 25 years, mining has consisted of multiple seam operations utilizing room and pillar, and longwall mining methods. Investigation of dust sources and control technology for longwall plow operations / (Pittsburgh, Pa.: U.S. Dept. of the Interior, Bureau of Mines, ), by John J.

McClelland and Robert A. Jankowski (page images at HathiTrust) Surface subsidence over longwall panels in the western United States: final results at the Deer Creek Mine, Utah / (Pgh.

Mining of these Wyoming trona beds is done by underground methods. Room-and-pillar and longwall mining operations are both present in the Green River Basin. The underground trona mines in the Green River Basin are classified as gassy by the Mine Safety and Health Administration (MSHA), the primary federal mining regulatory agency in the by: 1.

multiple seam interactions even when interburden thickness is substantial. 9 The direction of mining can influence the degree of multiple seam interaction.

Mining from the gob to the solid generally results in lower stress concentrations than from the solid to the gob. 9 The type of remnant pillar structure (gob-solid boundary or isolated.

To evaluate the potential interaction between the two mine works and to determine the pillar safety factor, Analysis of Multiple Seam Stability (AMSS) software was initially used to determine pillar dimensions to obtain a minimum safety factor of for areas under pooled water, as well as a minimum safety factor of for areas not under.

The mine is characterised by high methane content and outburst prone coal seams. Due to the mine is in an anticline region with steeply dipping nature of most of the coal seams (over 45°) in the coalfield, unlike prevailing longwall or room and pillar mining methods applied in horizontal coal deposits, the mining method used here is sublevel caving (SLC), as illustrated in Fig.

by: @article{osti_, title = {Mechanics of coal mine bumps and the interaction between coal pillars mine roof and floor. Research report, }, author = {Crouch, S.L. and Fairhurst, C.}, abstractNote = {The report describes research done on the mechanics of coal mine bumps over a month period at the University of Minnesota.

The general term 'coal mine bump' refers to the sudden. During the past 25 years, mining has consisted of multiple seam operations utilizing room and pillar, and longwall mining methods. Early multiple seam mining took place at the Deseret, Beehive and Little Dove mines utilizing room and pillar methods.

In the late 70`s and early 80`s longwall mining was introduced at the Deer Creek and Wilberg.Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars.

To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof ating the size, shape, and position of pillars is a complicated procedure, and is an area of.Multiple seam interactions: The severity of a multiple seam stress concentration typically depends on two factors: The thickness of the interburden between the active seam and the previously-mined seams.

In general, the thicker the interburden, the less likely that the interaction .