Seismic Velocity Of Coal In Indian Mines

The role of seismic surveying in coal mining exploration ...

1-8-1984· The National Coal Board recognised the rewards that could be gained from improve- ments in the quality and resolution of seismic surveying methods, both on surface and un- derground, and has now developed both methods to the point where they are playing an increasingly important role in the planning of mining activities both at new and existing mines. 255 SURFACE SEISMIC …

Deterministic seismic hazard assessment of coal fractures ...

Particle velocity of the source seismic motions induced by coal fractures with different tensile strength from 0.6 MPa to 1.8 MPa; (a) P wave particle velocity, (b) S wave particle velocity. Then the source seismic waves were further applied on the boundary of the roadway geometry, as shown in Fig. 5 b, and the resultant seismic motions in the roadway were obtained using the MSHA program.

Seismic Monitoring Strategies for Deep Longwall Coal Mines

Figure A9. Shift in calculated event locations when seismic velocity model fails to match actual velocity. Frame A shows raypath lengths calculated for an unmined coal panel with known seismic velocity. Frame B shows the effect of a modest 10% reduction in seismic velocity. Frame C shows the resultant change of the calculated event location where

Acoustic properties of coal from lab measurement

Figure 1. Synthetic seismic reflection from cyclic coal seams. Acoustic properties of coal from lab measurement Qiuliang Yao *, De-hua Han, University of Houston Summary Ultrasonic velocities, densities and porosities for a set of coal and surrounding silty coal, silty shale, and shaly coal samples were measured in laboratory. The pressure effect,

(PDF) Application of a high-resolution seismic ...

The study reveals (1) seismic sections up to 1000m depth with thick, gently dipping Barakar Formation, (2) thick coal horizons at a depth range of 200 to 500m, and (3) NW-SE striking and gently ...

Seismic Coal Exploration, Volume 16 - 1st Edition

Purchase Seismic Coal Exploration, Volume 16 - 1st Edition. Print Book & E-Book. ISBN 9780080372266, 9781483287065

Time-lapse Passive Seismic Velocity Tomography of …

Toggle navigation. Log in; Toggle navigation. View Item VTechWorks Home

Location of high seismic activity zones and seismic hazard ...

Seismic velocity tomography ... Passive tomographic imaging has been used in Polish coal and copper mines to evaluate seismic hazard ... Germany, the United States, Canada, India, UK, China and ...

Estimation of rock load in development workings of ...

RESEARCH COMMUNICATIONS 2168 CURRENT SCIENCE, VOL. 114, NO. 10, 25 MAY 2018 In situ seismic refraction is a technique used in the coal mine roof to determine the seismic wave velocity and the extent of weak zones in the surrounding rock11.In seis-

STABILITY ANALYSIS OF OVERBURDEN INTERNAL DUMP …

2.3 Blasting and Seismic effect on dump material Ground vibration on account of earthquake and blasting, hampers the stability of dragline dumps.As per seismic map of India, Amlohri opencast mine falls under seismic zone-II with horizontal seismic coefficient of 0.02.The peak particle velocity and frequency of blast

Seismic Coal Exploration, Volume 16 - 1st Edition

Purchase Seismic Coal Exploration, Volume 16 - 1st Edition. Print Book & E-Book. ISBN 9780080372266, 9781483287065

Time-lapse Passive Seismic Velocity Tomography of …

Toggle navigation. Log in; Toggle navigation. View Item VTechWorks Home

Prediction of Fractures in Coal Seams with Multi …

Fractures that develop in coal seams threaten safety in many ways, but they can be predicted using fracture parameters derived from seismic data. However, the post-stack split shear waves are ...

Application of seismic velocity tomography in …

A better understanding of geological structures, stress regimes, and rock burst risks around longwall mining panels can allow for higher extraction efficiency with reduced safety concerns. In this paper, the stress change of rock mass was first examined by using ultrasonic technique into laboratory-scale rock samples. Subsequently, the active and passive seismic velocity tomograms were ...

University of Wollongong Research Online

Figure 2 - P-wave velocity determination of sandstone samples from Laboratory testing Seismic profiling at OCP coal mine . A seismic profiling survey was carried out to characterise sandstone rock mass on the basis of P-wave velocity measurements. The survey was carried out at the surface of sandstone rock mass towards N.E direction of the Mine.

Time-lapse Passive Seismic Velocity Tomography of …

Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the processes that lead to ground failure in mines, especially large, violent failures, such as bumps.

27th Seismic Research Review: Ground-Based Nuclear ...

SOURCE PARAMETERS OF SEISMIC EVENTS IN A COAL MINE IN INDIA C. Srinivasan, C. Sivakumar, and R. N. Gupta National Institute of Rock Mechanics Sponsored by Coal India, Ministry of Mines, Government of India. Contract No. WOS052121 ABSTRACT Longwall mining is one of the most widely used mining methods in underground coal mining. Longwall mining

STABILITY ANALYSIS OF OVERBURDEN INTERNAL DUMP …

2.3 Blasting and Seismic effect on dump material Ground vibration on account of earthquake and blasting, hampers the stability of dragline dumps.As per seismic map of India, Amlohri opencast mine falls under seismic zone-II with horizontal seismic coefficient of 0.02.The peak particle velocity and frequency of blast

Prediction of in situ rock strength using sonic velocity

2014 Coal Operators’ Conference The University of Wollongong 12 –14 February 2014 89 PREDICTION OF IN SITU ROCK STRENGTH USING SONIC VELOCITY Nicholas Butel1, Alex Hossack2 and Mehmet S Kizil1 ABSTRACT: Uniaxial Compressive Strength (UCS) and sonic velocity correlations are used widely in the Australian coal mining industry to predict in situ rock strength.

Coal India Limited Corporate Presentation

Coal India contributed 84% to India’s total coal production in FY2016 Coal accounts for 58%3 of India’s primary energy consumption Coal India operates 413 mines via 8 coal producing subsidiaries billion tons 68.6 19.8 88.4 Resources Reserves Total Coal India, 84.4% Singareni Collieries, 9.4% Others, 6.2% FY2016 India coal production: 639mt2 ...

Time-lapse Passive Seismic Velocity Tomography of …

Time-lapse passive seismic velocity tomography was conducted utilizing data from three underground longwall coal mines to produce a better understanding of the processes that lead to ground failure in mines, especially large, violent failures, such as bumps.

University of Wollongong Research Online

Figure 2 - P-wave velocity determination of sandstone samples from Laboratory testing Seismic profiling at OCP coal mine . A seismic profiling survey was carried out to characterise sandstone rock mass on the basis of P-wave velocity measurements. The survey was carried out at the surface of sandstone rock mass towards N.E direction of the Mine.

Time-lapse Passive Seismic Velocity Tomography of …

Seismic velocity tomography can be implemented to infer stress distribution at mines and determine when a dangerous situation is developing. Three different methods were employed to compare time-lapse passive seismic tomograms at a longwall coal mine. The dataset is well sampled with a …

Seismic Monitoring in Mines | Semantic Scholar

4-6-2020· Seismic transducers. Seismic monitoring systems. Deconvolution, polarisation and wavelet transform of seismic signals. Seismic ray tracing. Location of seismic events. Seismic velocity inversion from microseismic data. Seismic source radiation and moment tensor in time domain. Spectral analysis and seismic source parameters. Non-linear dynamics of seismic flow of rock.

27th Seismic Research Review: Ground-Based Nuclear ...

SOURCE PARAMETERS OF SEISMIC EVENTS IN A COAL MINE IN INDIA C. Srinivasan, C. Sivakumar, and R. N. Gupta National Institute of Rock Mechanics Sponsored by Coal India, Ministry of Mines, Government of India. Contract No. WOS052121 ABSTRACT Longwall mining is one of the most widely used mining methods in underground coal mining. Longwall mining

NIOSHTIC-2 Publications Search - 20042191 - Time-lapse ...

Seismic velocity tomography can be implemented to infer stress distribution at mines and determine when a dangerous situation is developing. Three different methods were employed to compare time-lapse passive seismic tomograms at a longwall coal mine. The dataset is well sampled with a …

Welcome to CMPDI

Central Mine Planning & Design Institute Limited (CMPDI) is a Government of India enterprise having its corporate headquarters at Ranchi in India. It is a fully owned subsidiary of Coal India Limited (CIL) and a Schedule-B company.

Densities, porosities, and seismic velocities of some ...

Densities, porosities, and seismic velocities ofsome rocks from Victoria Land, Antarctica P. J. BARRETT AND P. C. FROGGATT Antarctic Research Centre & Department of Geology, Victoria University of Wellington, Private Bag, Wellington, New Zealand ABSTRACT Density, porosity, and compressional wave velocity have been measured in the laboratory for 7S

Aspects of seismic hazards caused by the Mining

Underground mine explosions cause earthquakes of magnitude M = 3.4. On 23 February 2008, which occurred to date strongest vibration events in Saarland with a maximum vibration velocity of 93.54 mm / s, which corresponds to a value of 4.0 on the Richter scale? Experiences have shown that in situ coal mines seismic

Citizen's Guide to Coal Mine Blasting in Indiana

loosen the rock above the coal seam. Mine operators drill holes in which to load explosives to fracture the rock layers. The blasting agent commonly used in coal mines is called ANFO, which is a mixture of Ammonium Nitrate (a common fertilizer), and fuel oil. (Dynamite is not typically used in surface coal mining to fracture the rock).