India Remote Sensing (IRS) satellite data ... Pennsylvania Coal Mine example. Engineering GP Methods •Seismic Reflection and Refraction velocity contrasts needed •Ground Penetrating Radar need very resistive ground but generally not …

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.

To overcome these colossal problems, an underground real time microseismic monitoring technique has been implemented in the working panel-P2 in the Rajendra longwall underground coal mine at South Eastern Coalfields Limited (SECL), India. The target coal seams appears at the panel P-2 within a depth of 70 m to 76 m.

Mar 24, 2017· 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 …

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

Sep 23, 2014· Seismic velocity tomography. Using the artificially created or mining-induced sources and geophones mounted on the surface or underground, the seismic velocity V(x, y, z) distribution can be inversed in the spatial coverage area of the source–geophone geometry, which depends on the relationship that the velocity along a seismic ray is the raypath distance L …

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

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 …

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

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 seismic disturbances induced by blasting will depend on the total explosive energy released during ... of cracks in the coal roof at peak particle velocity of 297 mm/s but spalling of coal chips from pillars and roof started ... 250 mm/s. [27] conducted an extensive study in six coal mines in India and established the threshold value of ...

2007 - 2012 Indian School of Mines, Integrated Master of Science in Applied Geophysics GPA 8.64/10.0 (1 st class 1 st rank) Thesis: Prediction of coal …

Tomographic images showed two distinct and significant P wave velocity anomalies: a low-velocity zone at the source region of a M sub N 2.3 mining-induced tremor recorded in 1985 and a …

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.

control safety hazards. Seismic event waveforms collected with a 23-station three-dimensional sensor array during longwall coal mining provide the data set used in the analyses. A spatially variable seismic velocity model is constructed using seismic event sources in a passive tomographic method.

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

wave or Secondary (S) wave. These waves are observed at costal seismic stations that record sub-ocean earthquakes at regional distances. Fig 3: T-phase of the 2004 Sumatra main shock recorded at Visakhapatnam, India. Similar to low velocity layer in the upper mantle, there is also low velocity channel in deep ocean.

Jun 12, 2017· 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 ...

Sep 01, 2015· The maximum value of P-wave velocity is up to 5700 m/s, while the maximum positive anomalies of velocity and velocity gradient are 0.23 and 0.21, respectively, which indicates that the areas mentioned above were at a middle seismic hazard risk at present stage and in the further mining period, due to the rupture or movement of overburden above ...

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

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 sandstone rock mass on the basis of P-wave velocity (Vp) measurements.

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

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.

disturbances and other mining activ ities has bee n initiated at the Opencast Coal Mines, India using . ... defined with a P wave velocity of ... Seismic monitoring in surface mines could be ...

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 …

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 …

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.

DEPARTMENT OF MINING ENGINEERING INDIAN INSTITUTE OF TECHNOLOGY (ISM) DHANBAD ... o Seismic velocity of rocks ... index for finding the susceptibility of coal to spontaneous heating. o Precise instruments, for carrying out …

Seismic Velocity In Iron Mines In Goa India. 11/09/2018· Seismic Velocity In Iron Mines In Goa India. Mineral Processing Equipment: Seismic velocity in iron mines in goa india A type of mining equipment that can trigger the development and change of the beneficiation technology industry.The main core machines are ball mills, rod mills, flotation machines, magnetic …

Based on the calculation of coal resources, Indo-nesia retains 161 billion tons of coalif such quanti-ties are exploited at current production levels, it will satisfy the need of coal up to 150-200 years. Approximately 120 billion tons of coal can be mined using an open pit method and the rest by underground mining technique (Badan Geologi, 2012).

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.

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).

Apr 28, 2021· 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 …