3 edition of Large-scale strata response to longwall mining found in the catalog.
Large-scale strata response to longwall mining
by U.S. Dept. of the Interior, Bureau of Mines in Washington, D.C. (810 7th St., N.W., Washington 20241-0001)
Written in English
|Other titles||Large scale strata response to longwall mining.|
|Statement||by R.O. Kneisley and K.Y. Haramy.|
|Series||Report of investigations -- 9427., Report of investigations (United States. Bureau of Mines) -- 9427.|
|Contributions||Haramy, Khamis Y., United States. Bureau of Mines.|
|The Physical Object|
|Number of Pages||25|
During longwall mining, a total of mm tensile deformation was recorded in the overburden strata and as a result horizontal bed separations and gaps were formed. Bed separations were observed to start in the roof of the mining seam and gradually propagate toward the surface as Cited by: 5. Longwall mining Weak interface Shear offset abstract Gas wells traversing active longwall panels are susceptible to failure on account of various strata movements induced by mining activities. To reveal the dynamic impacts of longwall mining on the survivability of these shale gas wells, particularly during the mining cycle as the twin.
This paper reproduces the behaviour of the longwall face and shield in response to roof loading through a physical modelling study with a consideration of the basic operating principles of the shield leg cylinder. The extension and retraction of the leg cylinder and important characteristics of longwall shields are Cited by: 2. on longwall and room-and-pillar mining of coal. It has been estimated that coal extraction is respon sible for over 90 percent of worldwide mining-in duced subsidence (Alien, ), Longwall mining currently accounts for less than 10 percent of the coal mined in the United States, although it hasCited by:
Longwall mining Hardcover – January 1, by Syd S Peng (Author) › Visit Amazon's Syd S Peng Page. Find all the books, read about the author, and more. See search results for this author. Are you an author? Learn about Author Central 5/5(1). Longwall mining. See also what's at Wikipedia, your library, or elsewhere.. Broader term: Coal mines and mining; Used for: Mining, Longwall; Longwall method of mining; Filed under: Longwall mining Longwall gate road roof instability and methods of control in the lower Kittanning Coalbed of Central Pennsylvania /, by Eric R. Bauer, E. D. Krupa, and Jeffrey M. Listak (page images at HathiTrust).
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This U.S. Bureau of Mines report summarizes a study of large-scale strata response to longwall mining at a western U.S. coal mine. This study utilized surface and subsurface measurements, geologic mapping, in situ stress measurements, and pressure cell readings to characterize strata behavior.
Additional Physical Format: Online version: Kneisley, R.O. (Richard O.). Large-scale strata response to longwall mining (OCoLC) Material Type.
Get this from a library. Large-scale strata response to longwall mining: a case study. [R O Kneisley; Khamis Y Haramy; United States.
Bureau of Mines.]. This U.S. Bureau of Mines report summarizes a study of large-scale strata response to longwall min ing at a western U.S. coal mine. This study utilized surface and subsurface measurements, geologic mapping, in situ stress measurements, and pressure cell readings to characterize strata behavior.
Large-scale strata response to longwall mining: a case study / By R. (Richard O.) Kneisley, Khamis Y. Haramy and United States.
Bureau of Mines. Abstract. Includes bibliographical references (p. ).Mode of access: Internet. Large-scale strata response to longwall mining: a case study. Abstract "This report describes laboratory studies by the U.S.
Bureau of Mines to determine the suitability of a static oxygen (o2) adsorption test for evaluating the self-heating tendencies of coals. Reliable minimum self-heating temperature (sht) values from adiabatic oven.
Purchase Strata Mechanics, Volume 32 - 1st Edition. Large-scale strata response to longwall mining book Print Book & E-Book. ISBNBook Edition: 1. Surface and subsurface strata are inevitably disturbed above the longwall mined out gob. Figure 1 shows the four zones of disturbance in the overburden strata in response to longwall mining.A longwall shear cuts the coal seam and allows the immediate roof strata to cave into irregular blocky material to fill the void.
This is called the caved. By employing the longwall mining method, a series of intensive strata structure responses and activities will be induced including stress redistribution, fracture extension and strata movement.
NSW code of practice: Strata control in underground coal mines Scope and application This code is a practical guide to assist the mine operator to identify and control strata failure hazards as part of developing and implementing a principal mining hazard management plan, as required under the WHS (Mines) Regulation.
This code applies to the. Pages (December ) Download full issue. Previous vol/issue select article Evaluation of fully-coupled strata deformation and groundwater flow in response to longwall mining.
Research article Full text access Evaluation of fully-coupled strata deformation and groundwater flow in response to longwall mining. Jun-Mo Kim, R.R. The need for strata control may extend into a goaf area for a short distance, essentially to the goaf edge, however strata control within the goaf is generally of no interest.
In order to analyse strata reactions, properties such as strength (tensile and compressive), modulus of elasticity, Poisson's ratio, etc are required, as well as details.
Overburden response to longwall mining. In book: Advances in Coal Mine Ground Control, pp It demonstrates an integrated approach to studies of longwall mining-induced strata. 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.
longwall mining Mining. a mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal the coal is cut, the working area is protected by a movable, powered roof support system.
As the face progresses, the immediate roof. Advances in Longwall Mining Method have made this system more economically attractive because of its efficiency and production potential. The high productivity being achieved by longwall mining demonstrates its potential for being a substantial segment of underground coal production.
Longwall mines produce more than 30 pct of all underground. The longwall face is indicated by the number 8 in the diagram. Fig. Cutaway View of a Typical Longwall Mine In longwall mining, a panel of coal, typically around to metres wide, to metres long and 2 to 5 metres thick, is totally removed by longwall shearing machinery, which travels back and forth across the Size: 1MB.
Underground longwall mining of coal causes large scale disturbance of the surrounding rock mass. Stress changes and mining induced fracturing of the rock can increase the permeability and can liberate methane from the surrounding strata.
The influx of methane can be a significant hazard in longwalling operations and extensive methane mitigation. 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. Hasenfus, G.J., et al.: A hydrogeomechanical study of overburden aquifer response to longwall mining.
In: Peng Syd, S. (ed.) Proceedings of the 7th International Conference on Ground Control in Mining, pp. – West Virginia University, COMER, Department of Mining Engineering, Morgantown () Google ScholarAuthor: Samar S.
Ahmed, Samar S. Ahmed, Marwan AlHeib, Yann Gunzburger, Vincent Renaud. Advances in Coal Mine Ground Control is a comprehensive text covering all recent advances in coal mine ground control, the most advanced subsystem of the rapidly advancing coal mining systems. This complete resource is written by Professor Syd Peng who, alongside leading experts from the world’s major coal producing countries, has contributed extensively to the understanding of subsidence.
"In coal mining in China, the cutting height of the shearer in longwall faces is increasing. Owing to the increase of extraction height, the caved roof strata area is enlarged, and new issues are being encountered, such as determination of a suitable working resistance for the shield and control of.
The fracturing and caving process of key strata in overburden strata and the distribution law of abutment stress over key strata and immediate roof are investigated and the effect of the rupture of key strata on abutment stress in coal rib and the subsidence of earth’s surface are also analyzed.
The simulated results show that the abutment stress over key strata and immediate roof are not Cited by: