This paper presents a field seismic investigation that is effective in evaluating the in situ geotechnical properties and liquefaction potential of fine coal tailings subjected to mine blasting. In this study, seismic refraction, multichannel analysis of surface waves, and seismic monitoring are performed on two coal tailings impoundments 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 ...

The #15 coal seam in the Carboniferous Taiyuan Formation is a stable and recoverable coal seam that spans the entire area and is the main coal mining seam in the Lower Taiyuan Formation, with a thickness of 4.07–6.90 m and a mean thickness of …

To overcome these massive problems and to get prior information of strata behavior in the Indian coal mining industry, a real time microseismic study has been carried out for the first time during 2001–2004 in the coal panel-P2 of the Rajendra longwall underground coal …

India is a country rich in coal reserves. Estimation of geo-mechanical properties of the coal has a direct bearing on the production of the mine. It is directly related to the design and stability of slope benches, dumps, in surface mine and pillar

lighting, and coal-fired power plants. Coal is also widely used in water purification as activated carbon (Pryor et al., 1999). Coal mining dates back to 2000-1000 BC. Early coal extraction methods were small scale and near the ground surface. Typical methods of extraction were bell pits, drift mining, and small scale shaft mining.

The earlier applications of seismic monitoring method in India are restricted mainly to various underground mines,,, . Chouhan has reported induced seismicity from the Raniganj coal seam in the form of bumps from the Chinakuri colliery [20] .

Finally, the seismic response of joints and beddings in rocks was revealed. This work put forward some references for early weakening and controlling coal-rock dynamic disasters triggered by seismic wave in coal mines based on the attenuation effect of artificial discontinuity such as joint and bedding.

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Coal mining activities began in this area about 300 years back in a random manner and standard coal mining practices such as board and pillar were adopted during the late 19th century (Srivastava & Mitra 1995; Lahiri-Dutt 2003). The sizes of the panel and coal pillar vary around 200 m, and between 20 and 24 m, respectively.

Longitudinal wave velocities in numerous synthetic and natural porous media at room temperature and pressure have been measured. Basic characteristics of the measuring device are briefly described. Wave velocities have been found for aggregates of uniform spheres of various diameters both when dry and when saturated with water, brine, organic liquids and plastics. The effect of porosity on the ...

7.5 m and has an average seismic velocity of about 390 m/s. It overlies high- velocity, relatively strong sedimentary bedrock that has velocities greater than about 1330 m/s. The low-velocity layer is also present at the other eight seismic refraction sites in the basin; a similar layer has also been

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

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

In iron ore areas of Goa the practical results obtained with seismograph were as follows- Seismic velocity in overburden (practically laterite) was 600 to 1,200 m per second. In iron ore it was 1,050 to 1,500 m per second, but in some cases velocities as high as 1,800 to …

of actual blast damage or weak zone in the coal mine roof leads to roof stability problems3. In situ seismic refraction is a technique that can be used in the coal mine roof in order to determine seismic wave velocity and the extent of weak zones in the surrounding rock4. A pre- and post-survey usually identifies the extent of damage zone due

With multi-component seismic data, Brodic et al. predicted fracture systems by mode-conversions 28. With the increase in the depth of coal mines, P …

Rockburst is a typical dynamic disaster in underground coal mines which its occurrences relate to the mechanical quality of coal seam and surrounding rock mass and also the condition of stress distribution. The main aim of this paper is to study the potential of rockburst in a longwall coal mine by using of passive seismic velocity tomography and image subtraction technique. For this purpose ...

Request PDF | On Oct 1, 2014, Wu Cai and others published Application of seismic velocity tomography in underground coal mines: A case study of Yima mining area, Henan, China | …

Problem Definition. Coal is an indispensable resource currently as it accounts for 38% of the world's electricity and over 71% of the world's steel production (World Coal Association 2019).In many countries, coal fuels a dominating percentage of power generation, such as India, South Africa, Australia, and China in particular, where coal accounts for almost 70% of the energy structure ...

12%The Nirsa block, a coal mining area, and an industrial town lies in the southern part of Dhanbad district, at the border between the Indian states of Jharkhand and West Bengal. This area manifests the significant seismic risk posed by earthquakes, natural as well as induced, of high enough seismic intensity VI and VII from regional and local earthquakes. Hence, it is …

Assessment of Geo-mech anical properties of some. Gondwana Coal using P-Wave Velocity. Dhananjai Verma, Ashutosh Kainthola*, Rajesh Singh and T …

The seismic velocity tomography of these three wave groups can be used to detect structures, coal thickness changes, and areas of stress concentration and gas enrichment in the coal panel (Cardarelli and Cerrto 2002; Zhang and Liu 2006). Traditional P-wave and S-wave tomography are based on the theory of minimum time and mainly reflect the ...

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

or velocity in terms of the rock mass properties. While the seismic refraction and reflection surface methods are currently the most established methods for this purpose in 3Italic numbers in parentheses refer to items in the list of references at the end of this report. mining, these have limitations for applications in the as­

The network was used to predict the elastic and shear moduli of the coal-measure rocks over a longwall coal mine in SW Pennsylvania. This approach demonstrated that it could be used for prediction of elastic and shear moduli of coal-measure rocks with reasonable accuracy. 1. Introduction The properties of coal-measure rocks within the longwall

Monitoring and early-warning are critical for the prevention and controlling of rock burst in deep coal mining. In this study, rock burst risk assessment criterion was built based on the correlativity between seismic velocity and stress state in coal and rock body. Passive seismic velocity tomography using mining-induced seismic waves was conducted regularly and continuously.

Indian Institute of Technology (Indian School of Mines), Dhanbad. Report this profile ... (Seismic Interpretation, Well to Seismic Tie, Structural contouring, Seismic Attributes, Velocity Model Building) 3) Interactive Petrophysics (Log Interpretation ) 4) Hampson …

Technology project sponsored by Ministry of Coal, Govt. of India with CMPDI (Central Mine Planning and Design Institute) as the nodal agency and CIMFR (Central Institute of Mining and Fuel Research) and CMPDI as implementing agencies. Peak particle velocities in the underground coal mine roofs, pillars and floors were monitored using geophones.

Bumps in underground coal mines are violent events that result from a buildup of stress, usually in mines underlain and overlain by massive strata. 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 active and passive seismic velocity tomograms were simultaneously applied on the longwall mining panels at the Yima Yuejin coal mine, Henan Province, China, and the ability of the seismic velocity tomography to illustrate geological discontinuity, stress redistribution, and rock burst hazard has been shown with two case studies and many of ...

2 Geological outline and seismicity. The Nirsa region, located at 23.780 N 86.720 E in the Indian state of Jharkhand, has an. average ele vation of 139 m (456 ft). The study region is a part of ...

Blast optimisation studies were conducted at an opencast coal mine in India for selection of a site specific explosive for different rock types. This seismic refraction survey technique was applied at sandstone benches of a coal mine for rock mass characterisation and blast optimisation by impedance matching of explosives. Field experiments were conducted on seismic profiling to characterise ...

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).

velocity as per the current DGMS standard is 5 mm/s. In complying with such a low statutory limit, coal mines located close to surface structures are struggling for their survival. Other conditions being similar, non-coal mines are in a better position because frequencies are relatively high for which permissible levels are also high.