Surface Subsidence Over Longwall Panels in the Western United States by United States. Bureau of Mines. Download PDF EPUB FB2
Measured subsidence values were obtained over four adjacent longwall panels. Major subsidence characteristics such as longitudinal and transverse profiles, angles of draw, time-related subsidence development, and critical width are discussed. The maximum subsidence value of Ft was 68 pct of the mining thickness.
Get this from a library. Surface subsidence over longwall panels in the western United States: final results at the Deer Creek Mine, Utah. [Frederick K Allgaier]. As part of its mine subsidence research program, the Bureau of Mines and the American Electric Power Company cooperated on a study, conducted at the Price River Coal Company No.
3 Mine, directed toward developing the capability to estimate the surface subsidence resulting from longwall mining in a geologic, topographic, and mining environment common to coalfields in the Western United States.
Surface subsidence over longwall panels in the western United States. [Avondale, Md.]: U.S. Dept of the Interior, Bureau of Mines, (OCoLC) Online version: Allgaier, Frederick K. Surface subsidence over longwall panels in the western United States.
[Avondale, Md.]: U.S. Dept of the Interior, Bureau of Mines, (OCoLC) Surface subsidence over longwall panels in the western United States: monitoring program and preliminary results at the Deer Creek Mine, Utah / ([Avondale, Md.]: U.S. Dept of the Interior, Bureau of Mines, ), by Frederick K.
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Publication date Topics Mine subsidences, Longwall mining Publisher Pgh. [i.e. Pittsburgh] Pa.: U.S. Dept. of the Interior, Bureau of MinesPages: longwall panel and it can be seen that the majority of the subsidence occurs over the centre of the longwall and tapers off around the perimeter of the longwall.
The subsidence is typically less than the thickness of coal extracted underground. Fig. Typical Subsidence Profile Drawn to a True Scale The angle at which the subsidence spreads File Size: 1MB. 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 Cited by: Surface subsidence over longwall panels in the western United States: monitoring program and final results at the Price River Coal Co.
3 mine Utah / (Pittsburgh, Pa.: U.S. Dept. of the Interior, Bureau of Mines, ), by A. Fejes (page images at HathiTrust). Author of Investigation of A Laboratory Test For Determination of the Free-Swelling Index of Coal, Physical Properties of Mine Rock, Laboratory Experiments in Electrokinetic Densification of Mill Tailings (in Two Parts), Vanadium, Surface Subsidence Over Longwall Panels in the Western United States, Podiform Chromite Occurrences in the Caribou Mountain and Lower Kanuti River Areas, Central.
Subsidence from longwall coal mining (PDF - KB) Subsidence is a localised lowering of the land surface. It occurs when underground voids or cavities collapse, or when soil or geological formations (including coal seams, sandstone and other sedimentary strata) compress due to changes in moisture content and pressure within the ground.
Mining. Several types of sub-surface mining, and specifically methods which intentionally cause the extracted void to collapse (such as pillar extraction, longwall mining and any metalliferous mining method which uses "caving" such as "block caving" or "sub-level caving") will result in surface subsidence.
Mining-induced subsidence is relatively predictable in its magnitude, manifestation and. Suggested Citation:"THE SUBSIDENCE PROBLEM."National Research Council. Mitigating Losses from Land Subsidence in the United gton, DC: The. Fcjes, A. Surface Subsidence Over Longwall Panels in the Western United States: Monitoring Program and Final Results at the Price River Coal Co.
3 Mine, Utah. BuMines IC ,21 pp. Studies involving subsidence measurements over longwall panels have shown that additional surface subsidence may occur over a mined-out panel as an adjacent panel is being mined, King referred to this as a “triggered subsidence.” This concept can also be applied to multiple seams when mining above a mined-out panel.
PDF | The surface movement in an area of about 22 km² above the underground coal mine of Houthalen was analyzed based on Interferometry with Synthetic | Find, read and cite all the research Author: A. Vervoort. of underground coal mining in the Western United States appears to be the implementa-tion of longwall mining techniques developed in Europe.
Although longwall mining is used virtually exclusively to produce coal from un-derground mines in Europe, it accounts for only 5 percent of annual underground coal production in the United States. Longwall. Purchase Subsidence, Volume 56 - 1st Edition.
Print Book & E-Book. ISBNBook Edition: 1. Critical review of numerical stress analysis tools for deep coal longwall panels under strong strata SURFACE SUBSIDENCE OVER LONGWALL PANELS IN THE WESTERN UNITED STATES -FINAL RESULTS AT THE.
Another study by the Bureau of Mines (Fejes, ) found that subsidence over to foot wide panels at depths of to 1, feet with extraction of feet of coal resulted in subsidence at the center of the panel of to feet (width/depth ratios of ). Surface deformation was found to continue beyond the panel edge and.
8 Types of land subsidence, by Alice S. Allen, Bureau of Mines, U.S. Department of the Interior, Washington, D. INTRODUCTION Land subsidence is merely the surface symptom, and the last step, of a variety of subsurface displacement mechanisms. Not all of these mechanisms are well understood.
Subsidence processes. Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production.
In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is a pit, and the. Surface subsidence over longwall panels in the western United States: monitoring program and final results at the Price River Coal Co. 3 mine, Utah. Information Circular/ Technical.
This report summarizes the results from the subsidence research study completed by the U.S. Bureau of Mines at the Roadside Mine, Powderhorn Coal Co., Palisade, CO.
This research was conducted from February to Augustwith additional data obtained during Julyto evaluate residual subsidence. The Bureau studied subsidence at three distinct room-and-pillar sections at separate.
Subsidence can also be caused by natural events such as earthquakes, soil compaction, glacial isostatic adjustment, erosion, sinkhole formation, and adding water to fine soils deposited by wind (a natural process known as loess deposits).
Subsidence can happen over very large areas like whole states or provinces, or very small areas like the. State-Of-The-Art of Ground Control in Longwall Mining and Mining Subsidence [Chugh, Yoginder P.] on *FREE* shipping on qualifying offers.
State-Of-The-Art of Ground Control in Longwall Mining and Mining Subsidence. UNITED STATES DEPARTMENT OF THE I. Report of Investigations Case study of the effects of longwall mining induced subsidence on shallow observation wells above a series of four adjacent longwall panels in southwestern Pennsylvania, for about 4 yr.
Subsidence occurs when large areas of coal are mined and the resulting settlement of roof material into the void (the goaf) results in the surface subsiding over the affected area.
The degree of subsidence that may result from mining will be determined by the thickness of coal extracted, the extent of the area mined, the nature of overburden. ic / a feasibility study of the use of surface redox measurements to detect subsurface methane, coal burns, and hydrothermal deposits, pb, $ 12 ic / surface subsidence over longwall panels in the western united states, monitoring program and preliminary results at the deer creek mine, utah, pb, $.
Impacts of Longwall Coal Mining on the Environment in New South Wales Page 3 Longwall mining is a form of underground coal mining that was introduced to Australia and the United States from Europe in the early s.
It allows mining companies better access and vastly improved recovery rates than older methods of underground mining.Surface subsidence profiles for dipping seams [Whittaker and Reddish, ].
Figure Location of arching over longwall mining [Whittaker and Reddish, ]. Figure Subcritical, critical and supercritical subsidence surface effects [Whittaker and Reddish, ].
Figure It can be seen that in the cases of longwall mining panels with gob caved without packing, the deeper the longwall panel is, the longer the time to reach the final subsidence is. However, it also can be found that the subsidence is completed within 6 months even though the depth of longwall panel is greater than that in FBS mine such as case E Cited by: