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Engineering-geophysical methods are used at present for locating mine shafts close to the surface. In practice, the simultaneous application of seismic, gravimetric, geoelectric and electromagnetic methods is an effective tool to specify locations of concealed shafts. However, this ability to detect ...
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Geophysical Methods & Applications SubSurface Surveys & Associates, Inc., established in 1988, specializes in near-surface geophysics and utility locating services and is dedicated to establishing strong client relationships. SubSurface Survey's extensive education and experience
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Geophysical detection of outbursts. Geophysical techniques provide the opportunity for remote assessment of the state of a rock mass and to remotely monitor changes in its behaviour. Geophysical techniques are widely used for these purposes in resource exploration and extraction. Because coal outbursts can be associated with geological ...
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Geophysical Technologies for Detecting Underground Coal Mine Voids, Lexington, KY, July 28-30, 2003 2 Resistivity of a material is a fundamental physical property related to the ability of a ma-terial to conduct electricity. If R is the resistance of a block of conductive material hav-
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Geophysical methods may from part of a larger survey and thus geophysicists must be in contact with the whole survey team and particularly to the client. ... (coal, gas, oil) Regional geological studies (over areas of 100s of km2 ) ... Electromagnetic methods detect anomalies in the inductive properties of the earth's subsurface rocks.
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2.2. Geophysical Characteristics. In order to avoid the multisolution of the single geophysical exploration method, improve the accuracy of exploration, and have a qualitative understanding of the geophysical characteristics of the exploration area, the resistivity logging method [24, 25] is used to study the resistivity distribution law of different depth strata in the exploration area.
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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. Drilling is the only known method for accurately determining the location and extent of the mine voids, but this is extremely expensive.
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Geophysical Methods for Void Detection ... Geophysical Imaging of an Underground Coal Mine Geophysical Imaging of a Karst Sinkhole and Void Beneath Airport Runway. 5/5/2015 10 Geophysical Imaging of Sinkholes and Underground Voids Aerial Photo Sink - Electrodes 130 – 170 ERI Profile
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(1989). Geophysical and Image Processing Methods for Detection of Fireholes in Brown Coal, Latrobe Valley. Exploration Geophysics: Vol. 20, No. 1-2, pp. 153-158.
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In order to realize fine comprehensive geophysical detection for coal mine goafs,based on the analysis of type classification,characteristic and applicabl e conditions of the mature surface geophysical methods,comprehensive geophysical cases,the optimization of surface comprehensive geophysical methods was carried out.The results showed that in order to achieve accurate comprehensive surface ...
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Abstract: Geophysical technologies have played an important role in the investigation of mine goaf. Usually, geophysical data are processed using individual inversion method and the imaging precision is decreased for the ambiguity. It is the most difficult to detect mine goaf accurately and effectively for geophysical technologies.
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A gamma ray log is the most versatile of the geophysical logs for the following reasons: (1) it does not require fluid in the hole; (2) it is not sensitive to small variations in hole diameter; and (3) it can be used to detect coal beds through well casing. In fact, near-surface gamma ray logs of cased oil and gas wells are a prime source of ...
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Since their introduction to the coal mining industries of the United Kingdom and West Germany in the 1970s, geophysical methods are now utilised in coal mining around the world. The range of applications in both surface and underground mining is extensive. Applications include coal seam mapping and geological fault detection, lithological ...
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A coal mine in Datong is an integrated mine. At present, there is goaf in the upper and lower part of the mining coal seam. There is a lot of ponding in the goaf, which has great potential safety hazards for production. In order to find out the scope and location of ponding in goaf, the comprehensive geophysical exploration method combining transient electromagnetic method and high-density ...
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Detection of water yield property is one of the most important tasks for mine water control. Because of low reliability of a single water detection method, it is necessary to find an effective water detection system. In this study, we established a circulatory system for water detection (CSWD) and analyzed working principles of each module of the system. The system was then tested in a China ...
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The geophysical technologies demonstration at the site has verified the effectiveness of the.… RVSPRVSP When Complemented by Sonar or Laser Mapping Combined with Engineering Practices – the most viable geophysical method to… Accurately and Economically Detect Mine Voids ¾Conclusions and Recommendations
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The geophysical characteristics of coal and rock (such as magnetic susceptibility, remanent magnetization, self-potential and resistivity) in coal-fire areas will be changed dramatically at high temperature, which constitutes the foundation of corresponding geophysical methods to detect coal …
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Geophysical methods, including gravity, electrical resistivity, ground penetrating (GPR), and airborne thermal imaging methods (e.g. Breytenbach and Bosch 2011;Van Schoor 2002; Van Schoor and ...
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Know More ; Exploration geophysics - Wikipedia - Know More Exploration geophysics is an applied branch of geophysics, which uses physical methods, such, The most direct method of detection of ore via magnetism involves detecting iron, Electric-resistance methods such as induced polarization methods can be useful for directly detecting sulfide bodies, coal and resistive rocks....
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Su, Y., 2015, Application of transient electromagnetic method in goaf roadway detection in a coal mine in Shanxi Province: Site Investigation Science and Technology, 5, 55– 57. Google Scholar; Tarantola, A., 1984, Inversion of seismic reflection data in the acoustic approximation: Geophysics, 49, 1259– 1266. Abstract Google Scholar
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from previous detection gradually to monitoring, early warning and forecasting. • Other advanced geophysical methods are introduced to this field, such as frequency-domain IP, nuclear magnetic resonance, seismic-electric advanced detecting technology, underground and ground joint geophysical method and mine seismic prospecting (MSP).
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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 …
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Abandoned mines are often difficult to locate. Detailed mine maps may be unreliable or missing. Conventional exploration (drilling) can easily miss targets as small as a mine entry. Nevertheless, geophysical methods are seldom employed to help map abandoned mines, possibly because geophysics surveys are perceived to be too expensive or will not help to solve the problem at hand.
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Geophysical Technologies for Detecting Underground Coal Mine Voids Forum July 28-30, 2003 – Lexington, Kentucky LOCATING AND CHARACTERIZING ABANDONED MINES USING MICROGRAVITY by Richard C. Benson1, Ronald D. Kaufmann1, Lynn Yuhr1, Richard Hopkins2 ABSTRACT Surface geophysical methods can be an important part of any site characterization effort.
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GEOPHYSICAL METHODS The selected geophysical methods were employed at the same survey site to provide: 1) a more comprehensive data interpretation; 2) the basis for the performance evaluation; and 3) to determine the advantages and limitations of these technologies to detect accurately mine voids in a cost-effective manner.
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detect the water-rich area of underground karst structure and ensure the safety of coal mine production. In the Carboniferous coal seam of Datong coalfield, the comprehensive geophysical methods,including surface 3D Seismic and CSAMT exploration, can effectively detect the water rich area of …
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Zhi-fei, M. A., & Hai-ming, M. A. (2008). Application of Geophysical Exploration Methods in Prospecting Geological Disasters in Coal Mine. China Mining Magazine, 9, 46-50. has been cited by the following article: TITLE: Evaluation of Mine Geological Environment of Guqiao Coalmine
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The method of detecting Top of Coal while drilling brings significant benefits to surface mining operations, including: Providing a reliable indication of approach to Top of Coal that will enable drilling to be stopped before touching coal or at a minimum standoff distance. Increase production by reducing damage to coal from blasting.
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An AVAF inversion method for detecting hydrocarbons ... Shangxu Wang, i Yuan, An AVAF inversion method for detecting hydrocarbons, Journal of Geophysics and Engineering, Volume 14, Issue ... Geophysical investigations for stability and safety mitigation of regional crude-oil pipeline near abandoned coal mines . Advertisement. Advertisement.
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In recent years, geophysical testing has been used as a tool to initially screen undermined sites in an effort to detect the location of possible voids or disturbed geologic strata. Using geophysical data, borings may be located in areas underlain by anomalous conditions, rather than on an arbitrary grid pattern. Two methods that appear to show ...
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At present, the geophysical method is a hot topic in detecting the overburden damage, which has the characteristics of being fast, low cost and dynamic . Yang applied the magnetotelluric (MT) method to detect the water-rich properties of collapse columns in a coal mine and constructed boreholes on the ground surface for data validation. The ...
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Within the framework of the Sino-German research initiative "Innovative technologies for exploration, extinction and monitoring of coal fires in Northern China" a number of different geophysical methods have been applied to determine their use on coal fire detecting, accompanying the extinguishing processes, controlling of the extinction and finally monitoring the extinction success.
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