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In deep mine applications, GPR is invaluable for identifying geologic features that may be potential areas for rock bursts, such as fractures, shear zones and faults. This data illustrates a GPR scan of the roof in a salt mine and shows the variable thickness of salt in the roof structure. This data was collected with a SIR 30E and a 400 MHz ...
Mar 19, 2016· Abstract. Mine water and mine inflow water are closely linked to the risk of mine water disasters. The relationships between various geophysical parameters and the volume of water in mine tunnels were considered by using an integrated suite of appropriate geophysical methods [ direct current (DC) resistivity, transient electromagnetic method (TEM), and the seismic scattered wave .
Katja Essen, Thomas Bohlen, Wolfgang Friederich, Thomas Meier, Modelling of Rayleigh‐type seam waves in disturbed coal seams and around a coal mine roadway, Geophysical Journal International, /, 170, 2, (511526), (2007).
Fortunately, coal mines are rarely dry and it is not necessary for the mine to contain much water for the mine openings to be detectable. Mine water with conductivity in the range of typical surface water could be about 500 S/cm, which corresponds to a resistivity of 20 ohmmeters.
In addition, the water detection technology for the roof of fully mechanized sublevel caving face was researched and applied in several coal mines, which has been verified by boreholes and mining ...
Controlling water in underground coal mines is an important safety consideration. There are very few methods that can detect or map water remotely within the working face of a mine. The twodimensional (2D) electrical resistivity tomography (ERT) method is sufficient for detecting water directly above the roof and below the floor, but it fails ...
will be the most important problem for abandoned coal mines in China in the next few decades. The old goaf water accumulation disasters are the most serious disasters in the coal mines in recent years. From 2011 to 2017, there were 75 serious water accidents in coal mines, including 61 old goaf water accumulation accidents, accounting for %.
Detection and delineation of coal mine fire in Jharia coal field, India using geophysical approach: A case study Rakesh Kumar Mishra1,PNSRoy2,3,4,*, Virendra Kumar Singh1 and Jai Krishna Pandey1 1CSIRCentral Institute of Mining and Fuel Research (CIMFR), Dhanbad, India.
Underground Mine Voids in Ohio WaterResources Investigations Report 024041 ... abandoned coal mines can be an important source of potable water (Crouch and others, 1980). In other areas, water qual ... Detection of abandoned mine voids by use of resistivity 5 72 m (horizontal distance). These anomalous areas are
For integrated resource coal mines, especially those that arethreatened by water inrush hazards, it is recommended to adapt the principles of ''forecasting in advance, detection before tunneling or mining''. Undermine detection includes undermine drilling detection, geophysical detection, and geochemical detection.
Katja Essen, Thomas Bohlen, Wolfgang Friederich, Thomas Meier, Modelling of Rayleigh‐type seam waves in disturbed coal seams and around a coal mine roadway, Geophysical Journal International, /, 170, 2, (511526), (2007).
May 19, 2020· The safety, efficiency, and green production of coal mines require more advanced geophysical detection technologies. In particular, the accurate detections of the locations of water .
NIOSH''s Safety Research Coal Mine. The mine roof area was scanned using ground penetrating radar technology before and after grout injection in an attempt to determine the extent of grout infiltration. A comparison of the preand postgrouting radar records showed a significant change at a mine roof depth of about four to five feet.
abandoned underground coal mine, eastern Illinois. This investigational program, in cooperation with the US Department of Labor Mine Safety and Health Administration (MSHA), was designed to advance current stateofpractices of geophysical technologies for detecting underground mine voids.
Due to the influence of mining technology, some coal mines will leave minedout areas (or goafs) in the rock mass after mining. If the distribution law and influence scope of minedout areas cannot be accurately explored and controlled, it will bring great potential safety hazards to subsequent coal mining and cause serious harm to adjacent houses, roads, bridges, railways, and so on.
Sep 01, 2017· A hidden waterbearing collapse column (WBCC), directly exposed during coal mining, is a potential source of serious mine flooding. Presently, the transient electromagnetic method (TEM) is widely used, which shows good performance in detecting WBCCs in coal mines.
DETECTION OF ABANDONED UNDERGROUND COAL MINES BY GEOPHYSICAL METHODS by HRBSinger, Incorporated Environmental Sciences Branch Science Park State College, Pennsylvania 16801 for the ENVIRONMENTAL PROTECTION AGENCY and the PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL RESOURCES Project 14010 EHN April 1971 For salo by the Superintendent of .
article{osti_, title = {Detection of coal mine workings using highresolution earth resistivity techniques. Final technical report, September 1979September 1980}, author = {Peters, and Campbell, and Sturdivant, }, abstractNote = {Shallow underground voids resulting from early coal mining and other resource recovery activities over the past several decades are now being ...
YCS2000A Transient electromagnetic instrument (TEM) for coal mines. Main application. This TEM is an intrinsic safety instrument designed for waterbearing/intruding structure detection in the gas or coal dust explosive dangerous environment of underground coal mine.
Although many geophysical techniques have been used to detect the disaster geological anomalous body in the Huaibei coal mine company, there are still many mining disasters happening. The main reason is that the coal seam is rich of water in Huaibei coal areas. If the ground water connects with tunnels, it will cause the flood to collapse the coal seam.
Aug 01, 2015· The DC resistivity method is an important geophysical detection method in tunnels and coal mines. Some progress has been made in routine detection, advanced detection, and realtime monitoring, which facilitates the development of DC resistivity method. The observation mode, nonuniqueness of inversion, and realtime monitoring need further ...
Coal mining Coal mining Prospecting and exploration: The fundamental objective of coal prospecting is to discover coal resources through a search. In areas where coal mining has not been previously practiced, the search process should result in obtaining coal samples that give reasonable evidence of the existence of a coal seam. Once a seam has been discovered, considerable further work is ...
23rd International Conference on Ground Control in Mining, Morgantown, WV, August 3–5, 2004 Author: F. S. Kendorski (AAI) One of the most dangerous events in underground coal mining is unexpectedly encountering water inrushes from undetected abandoned mines in the same seam. The surest and most confident method is probe drilling either from the mine or [.]
Old mine location maps (1958 vintage) indicate that the northwestern part of an undeveloped property near the town of Belleville, St. Clair County, Illinois, is situated above an abandoned and now waterfilled, roomandpillar type coal mine. The central and southeast parts of the Belleville property are shown as overlying intact (nonmined) coal.
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