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HGT Hydraulic Gyratory Crusher

HGT Hydraulic Gyratory Crusher

HGT Gyratory Crusher is a new-type intelligent coarse crusher with big capacity and high efficiency. It integrates mechanical, hydraulic, electric, automated, and intelligent controlling technologies which grant it with advantages traditional crushing

European Type Jaw Crusher PEW

European Type Jaw Crusher PEW

Jaw crushers has stationary jaw crusher, portable jaw crusher and mobile jaw crusher (crawler jaw crusher). Jaw crusher (PEW Series) is not only able to be used together with mine-selecting and gravel processing equipments but also be used independen

Jaw Crusher PE

Jaw Crusher PE

Jaw crusher is driven by a motor, and the moving jaw moves up and down via eccentric shaft. The angle between fixed jaw and moving jaw becomes smaller when the moving jaw runs down, then the materials are crushed into pieces. It will become bigger whe

HPT Hydraulic Cone Crusher

HPT Hydraulic Cone Crusher

Base on the latest technology and decades of years’ producing experience, Our Company designed the HPT series cone crusher. It has excellent crushing efficiency and good hydraulic control system. Now the HPC series cone crusher has wide application

HST Hydraulic Cone Crusher

HST Hydraulic Cone Crusher

HST Single Cylinder Hydraulic Cone Crusher is a new high-efficiency cone crusher independently researched, developed and designed by SBM through summarizing over twenty years of experience and widely absorbing advanced American and German technologies

CI5X Series Impact Crusher

CI5X Series Impact Crusher

CI5X Impact Crusher breaks materials with impact force. When materials enter the working area of hammer, they may be crushed under the high-speed shock and then thrown onto the impact device above the rotor for another crushing. Next, materials bounce

VSI6X Series Vertical Crusher

VSI6X Series Vertical Crusher

Due to the increasing market demand for the scale, intensification, energy conservation, environment protection and high-quality machine-made sand, SBM, a Chinese professional sand maker manufacturer, further optimizes the structure and function of tr

VSI5X Vertical Shaft Impact Crusher

VSI5X Vertical Shaft Impact Crusher

VSI Crushers Working Principle Raw material falls down into feed hopper, and then enters rotor through central entrance hole. It is accelerated in high-speed rotor, and then is thrown out at speed of 60-75m/s. When hitting anvil, it is crushed. Final

VSI Vertical Shaft Impact Crusher

VSI Vertical Shaft Impact Crusher

VSI Series vertical shaft impact crusher is designed by reputed German expert of SBM and every index is in worlds leading standard. It incorporates three crushing types and it can be operated 720 hours continuously. Nowadays, VSI crusher has replaced

VUS aggregate optimization system

VUS aggregate optimization system

The VU system is a global most-advanced dry-process sand-making system. The system is constructed like a tower. Its fully-enclosed layout features high integration. It integrates the functions of high-efficiency sand making, particle shape optimizatio

MTW-Z European Trapezium Mill

MTW-Z European Trapezium Mill

MTW European Grinding Mill is innovatively designed through deep research on grinding mills and development experience. It absorbs the latest European powder grinding technology and concept, and combines the suggestions of 9158 customers on grinding m

5X Series Roller Grinding Mill

5X Series Roller Grinding Mill

Grinding roller of MB5X Pendulum Roller Grinding Mill l adopts diluted oil lubrication. It is a technology initiated domestically which is maintenance-free and easy to operate. Diluted oil lubrication is oil bath lubrication, more convenient than grea

MTW Trapezium Mill

MTW Trapezium Mill

MTW European Grinding Mill is innovatively designed through deep research on grinding mills and development experience. It absorbs the latest European powder grinding technology and concept, and combines the suggestions of 9158 customers on grinding m

LM Vertical Mill

LM Vertical Mill

LM Vertical Grinding Mill integrates crushing, drying, grinding, separating and transport. The structure is simple while the layout is compact. Its occupational area is about 50% of that of the ball-milling system. The LM grinding mill can also be arr

TGM Trapezium Mill

TGM Trapezium Mill

TGM Super Pressure Trapezium Mill The operation principle of main unit of Trapezium mill is that main unit runs with the central shaft that is driven by a gear box. The top of the shaft is connected with a quincunx stand on which a grinding roller is

geophysical detection of water in coal mines

Detecting and monitoring of water inrush in tunnels and

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 real-time monitoring, which facilitates the development of DC resistivity method. The observation mode, non-uniqueness of inversion, and real-time monitoring need further

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Water Detection within the Working Face of an Underground

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 two-dimensional (2D) electrical resistivity tomography (ERT) method is sufficient for detecting water directly above the roof and below the floor, but it fails

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Detection of abandoned water-filled mine tunnels using the

The study showed that the downhole TEM effectively solves the problem of detecting and locating water-filled tunnels in the vicinity of a borehole. This information is a valuable complement to the geophysical detection of abandoned coal mine tunnels.

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Application of Comprehensive Geophysical Prospecting

Due to the influence of mining technology, some coal mines will leave mined-out areas (or goafs) in the rock mass after mining. If the distribution law and influence scope of mined-out 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.

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[PDF] Application of Comprehensive Geophysical Prospecting

DOI: 10.1155/2019/2368402 Corpus ID: 202099420. Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas @article{Luo2019ApplicationOC, title={Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas}, author={X. Luo and Shuang Gong and Zhonggang Huo and H. Li and Xinpin Ding},

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A Review of Geophysical Exploration Technology for Mine

Jun 12, 2017· Geophysical exploration can be effective in detecting and monitoring potential sources of coal mine water in-rushes and underground watercourses. Generally, in-mine seismic, DC resistivity, and transient electromagnetic methods are used for such purposes in China. However, such technologies can be influenced by many factors, such as roadways, fissures in the surrounding rocks, and various

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Overview on the application of geophysics in coal mining

Geophysical logging reflects the physical and chemical properties of coal through the characteristics of acoustical, electrical, radioactive detections [2,8,9].

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SURFACE GEOPHYSICAL METHODS FOR DETECTION OF

the electrical resistance. Mine voids in coal mines are usually encountered as resistiv-ity 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

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Geothermal Water at a Coal Mine: From Risk to Resource

Geothermal Water at a Coal Mine: From Risk to Resource. July 2015; Mine Water and the Environment 35(3) DOI: 10.1007/s10230-015-0352-6. Authors:

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NIOSHTIC-2 Publications Search 10005536 Coal Mine

Underground coal mining is hazardous due to changing geological conditions. One geophysical method showing promise for in-seam hazard detection is ground-penetrating radar (GPR). The Bureau of Mines recently completed preliminary studies to demonstrate the feasibility of using GPR for in-seam hazard detection.

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Geophysical Technologies to Image Old Mine Works (Journal

@article{osti_21149664, title = {Geophysical Technologies to Image Old Mine Works}, author = {Hanna, Kanaan and Pfeiffer, Jim}, abstractNote = {ZapataEngineering, Blackhawk Division performed geophysical void detection demonstrations for the US Department of Labor Mine Safety and Health Administration (MSHA). The objective was to advance current state-of-practices of geophysical

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Detection of Water-Filled Mining Goaf Using Mining

Water-filled mining goaves are extremely prone to water inrush accidents in coal mines, and the transient electromagnetic method (TEM) is a good geophysical method for detecting water-rich areas. Considering that conventional TEM was mainly carried out on the ground, to increase the detection resolution, the underground TEM was used to detect

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Research progress and development direction on advanced

In recent years, as the coal mine is gradually entering the deep mining stage, higher requirements of advanced detection in tunnel face are put forward due to geological environment changes such

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Detecting and monitoring of water inrush in tunnels and

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 real-time monitoring, which facilitates the development of DC resistivity method. The observation mode, non-uniqueness of inversion, and real-time monitoring need further

More

[PDF] Application of Comprehensive Geophysical Prospecting

DOI: 10.1155/2019/2368402 Corpus ID: 202099420. Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas @article{Luo2019ApplicationOC, title={Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas}, author={X. Luo and Shuang Gong and Zhonggang Huo and H. Li and Xinpin Ding},

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China Hydro-geophysical Instruments Manufacturers and

YCS2000A Transient electromagnetic instrument (TEM) for coal mines. Main application. This TEM is an intrinsic safety instrument designed for water-bearing/intruding structure detection in the gas or coal dust explosive dangerous environment of underground coal mine.

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Synergetic System for Water Body Detection in Coal Mine: A

Request PDF Synergetic System for Water Body Detection in Coal Mine: A Case Study Detection of water yield property is one of the most important tasks for mine water control. Because of low

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Experimental study on comprehensive geophysical advanced

Water-bearing structures in front of coal mine shaft drivages require effective advanced prediction. Based on the characteristics of coal field logging curve carrying rich geological information, it is introduced into the advanced prediction of water-bearing bodies in mine shafts. At the same time, mine geophysical prospecting technology, such as the DC resistivity method, can accurately and

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Borehole Geophysics USGS

Borehole geophysics is used in ground-water and environmental investigations to obtain information on well construction, rock lithology and fractures, permeability and porosity, and water quality. The geophysical logging system consists of probes, cable and drawworks, power and processing modules, and data recording units. State-of-the-art

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Numerical Simulation and Application of Mine TEM Detection

A hidden water-bearing 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.

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Archived: Interstate Technical Group on Abandoned

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 ohm-meters.

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Use of Electrical Resistivity to Detect Underground Mine

Underground Mine Voids in Ohio Water-Resources Investigations Report 02-4041 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

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Coal Mine Outburst Mining Science and Technology

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 structures and with zones of anomalous []

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Geophysical characterization of derelict coalmine workings

Geophysical interpretations were then verified with subsequent geotechnical intrusive investi-gations. Comparisons of historical map records with intrusive geotechnical site investigations . show care must be taken using map data alone, as the latter mineshaft locations was found to be inaccurate. Geophysical characterization of derelict coalmine

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