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Geophysical survey for cavity detection is one of the most common near surface application. The usage of resistivity methods are also very straightforward for the air filled underground voids, which should have theoretically very high resistivity in the ERT image, whereas the water filled cavities have low resistivity in Electrical Resistivity Tomography (ERT) image.
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.
Geophysics is one of the leading business with long history, covers mainly highly efficient investigation of coal resources, fine investigation of mining geological conditions, detection of the hidden disasterinducing factors, monitoring and early warning of mining dynamic hazard in coal mines, production and manufacturing of mining geophysical instruments, etc.
Detection of abandoned underground coal mines by geophysical methods. Technical Report Not Available. Acid drainage produced by abandoned coal mines continues to cause serious water pollution problems. Without knowing the exact location of the concealed openings and the extent of the mine, source abatement techniques are virtually impossible ...
the electrical resistance. Mine voids in coal mines are usually encountered as resistivity lows because of the presence of acidic mine water. Other Methods, such as magnetics and ground penetrating radar have been used for detecting subsurface cavities, but can be subject to precision, interference, or depth
Detection of Underground Voids in Ohio by Use of Geophysical Methods By Jens Munk and Rodney A. Sheets GEOLOGICAL SURVEY WaterResources Investigations Report 974221 Prepared in cooperation with the OHIO DEPARTMENT OF TRANSPORTATION and the DEPARTMENT OF TRANSPORTATION Columbus, Ohio 1997
Exploration geophysics is also used to map the subsurface structure of a region, to elucidate the underlying structures, spatial distribution of rock units, and to detect structures such as faults, folds and intrusive rocks. This is an indirect method for assessing the .
From the Arctic to Australia, from coal mines to windfarms, energy developments to skyreaching superstructures, Robertson Geo technologies have been used to acquire quality geophysical data from over 160 countries around the globe.
Abstract: Waterbearing goaves are one of the main causes for water inrush accidents in Chinese coal mines. At present, both the surface and subsurface geophysical technologies cannot fully meet the technical requirements of high precision detection for coal mines safety development and production.
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.
Coal Mine Outburst. Home / Archive by category: Coal Mine Outburst. ... has been explored as a stress relief mechanism to prevent outbursts. The water pressure fractures the coal in advance of the face and provides for slow relaxation of stress through lateral movement enhanced by the presence of [.] Read More ... Geophysical detection of ...
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 ...
Literature survey on the advance detection of dykes in underground coal mine workings Prof. G A Fourie Laboratory for Advanced Engineering ... mining companies and the geophysical companies in terms of the needs of the one and the capabilities of the other. Clarke (1976 a,b) and Ziolkowski (1981) ...
Get this from a library! Detection of abandoned underground coal mines by geophysical methods.. [Wilson Fisher, Jr.; HRBSinger, Inc. Environmental Sciences Branch.; United States. Environmental Protection Agency.; Pennsylvania. Department of Environmental Resources.] Acid drainage produced by abandoned coal mines continues to cause serious water pollution problems.
While coal mining in the UK and West Germany is now much reduced, these geophysical techniques have been taken up elsewhere in countries such as China, Australia and the USA. This paper provides an overview on the current status of the geophysical effort in coal mining.
The accurate and effective detection of underground goafs and their water abundance is the key to ensure the safety of mine production. On the basis of the relevant research, this paper defines different goaf types from the perspective of geophysical exploration and discusses the geophysical prerequisites for goaf detection.
offers 1,038 mineral detection equipment products. About 13% of these are industrial metal detectors, 4% are testing equipment, and 1% are mine drilling rig. A wide variety of mineral detection equipment options are available to you, such as free samples.
In coal mining, a poorly sealed borehole is one of the channels that can lead to an inrush of water and quicksand movement, seriously compromising the safety of the coal mine. In this paper, we ...
Keys to Successfully Using Geophysics to Detect Mine Voids and Covered Sinkholes Geotechnical, Geophysical, Geoenvironmental ... Geophysical Imaging of an Underground Coal Mine Geophysical Imaging of a Karst Sinkhole and Void Beneath Airport Runway. ... 2B2_G1543_Mine Void Detection_Brent
of unexpectedly encountering intrusive bodies during future mining justifies the upfront detection efforts and associated costs. possible geophysical solutions – The benefit of wellplanned and executed airborne magnetic surveying has already been demonstrated to the coal mining industry.
Detection of igneous intrusions Discontinuities in coal seams at the margins of dykes and other igneous intrusions can also be the sites of outbursts. Igneous intrusions can be investigated by geophysical surveys. Airborne and ground surface magnetic surveys are frequently conducted to locate dykes that might disrupt underground mining.
Request PDF on ResearchGate | Overview on the application of geophysics in coal mining | Since their introduction to the coal mining industries of the United Kingdom and West Germany in the 1970s ...
COMPUTERASSISTED INTERPRETATION OF GEOPHYSICAL WELL LOGS IN A COAL DEPOSITIONAL ENVIRONMENT, ILLINOIS BASIN, KENTUCKY By jEFFREY J. DANIELS andjAMES H. SCOTT ABSTRACT Physical properties detected by welllogging probes include density, porosity, water
An Interdisciplinary Response to Mine Water Challenges Sui, Sun Wang (eds) ©2014 China University of Mining and Technology Press, Xuzhou, ISBN 349 Tracing Groundwater Flow Paths in Coal Mine by Means of Geophysical and Borehole Flow Data
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