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Singh, K. K. K.
- Borehole Radar for Delineation of Unapproachable Underground Coal-Mine Galleries below Grand Chord Railway Lines
Abstract Views :228 |
PDF Views:83
Authors
Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
Source
Current Science, Vol 109, No 9 (2015), Pagination: 1729-1734Abstract
There are chances of railway lines being unsafe and thus directly affecting the safety of persons and goods due to the presence of old, abandoned and inaccessible mine workings below them. In the past, about 21 galleries in the leasehold of Kunstoria and Satgram areas of the Eastern Coalfields Limited (ECL), West Bengal and 33 galleries in the leasehold of Mugma area of ECL were driven below the Eastern Railway on the Grand Chord Howrah-Delhi railway line between Andal and Dhanbad. The abandoned mine plans of most of these galleries are not available and as such the exact locations of the galleries were not known. Keeping the above points in view, the present study was taken up for delineating the inaccessible and unknown mine galleries using borehole radar near Ratibati Colliery, Satgram area. A borehole radar survey has been conducted using an antenna frequency of 100 MHz along the six proposed railway sites. Six mine galleries were delineated in a radial distance varying from 4.5 to 5.0 m from the investigation boreholes and at the depths of 24, 27.5, 36.5, 51.5, 53.5 and 54.5 m respectively, from the surface. These mine galleries have been confirmed using direct non-coring drilling. It is also suggested that all mine galleries should be filled up with sand for the safety of the Grand Chord railway tracks in future.Keywords
Abandoned Mines, Borehole Radar, Coal-Mine Galleries, Railway Lines.Full Text
References
- Anon., Safety Action Plan 2000–01, Kuardi Colliery, Satgram Area, Unit-13&14; Pits, Eastern Coalfields Limited, West Bengal, 2001.
- Drossaert, F., Fenning, P. J., Giannopoulos, A., McCann, D. M. and McForde, Identifying mineshaft near railroads, School of Engineering and Electronics, University of Edinburgh, 2003.
- James, P., Conroy, M. S. and Erich, D. G., Borehole Tomography and Surface 3D Radar for Coal Mine Subsidence Detection, Springfield, Virginia, USA, 2005.
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- Everitt, R. A., Kozak, E. T., Lodha, G. S. and Serzu, M. H., Use of borehole radar techniques to characterize fractured granitic bedrock at AECL’s Underground Research Laboratory. J. Appl. Geophys., 2004, 137–150.
- MineVue Radar for Delineation of Abandoned Mine Galleries
Abstract Views :289 |
PDF Views:103
Authors
Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Dhanbad 826 015, IN
2 M/s International Groundradar Consulting Inc., 4389 Osler Street, Vancouer, BC V6H 2X6, CA
1 CSIR-Central Institute of Mining and Fuel Research, Dhanbad 826 015, IN
2 M/s International Groundradar Consulting Inc., 4389 Osler Street, Vancouer, BC V6H 2X6, CA
Source
Current Science, Vol 107, No 2 (2014), Pagination: 181-183Abstract
No Abstract.Full Text
- An Approach to Improve Shallow Surface Investigation Using Joint Analysis of Rayleigh and Love Waves
Abstract Views :274 |
PDF Views:84
Authors
Affiliations
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad 826 004, IN
2 CSIR-Central Institute of Mining and Fuel Research, Dhanbad 826 015, IN
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad 826 004, IN
2 CSIR-Central Institute of Mining and Fuel Research, Dhanbad 826 015, IN
Source
Current Science, Vol 109, No 7 (2015), Pagination: 1239-1242Abstract
No Abstract.Full Text
- Electrical Resistivity Imaging Technique to Delineate Coal Seam Barrier Thickness and Demarcate Water Filled Voids
Abstract Views :185 |
PDF Views:0
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 606 (Council of Scientific and Industrial Research), IN
2 Central Institute of Mining and Fuel Research, Dhanbad - 826 001, IN
1 National Geophysical Research Institute, Hyderabad - 500 606 (Council of Scientific and Industrial Research), IN
2 Central Institute of Mining and Fuel Research, Dhanbad - 826 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 5 (2009), Pagination: 639-650Abstract
Exploration and exploitation of coal seams is one of the major resources for the energy sector in any country but at the same time water filled voids/water logged areas in the old workings of these seams are very critical problems for the coal mining industry. In such situations, disasters like inundation, landslides, collapsing of the old seams may occur. In this regard, it is necessary to find out the water saturated/water filled voids and zones in the mining areas. Since no established technique is available to find such zones, an experimental study using Electrical Resistivity Imaging (ERI) has been carried out in one of the coal mining areas near Dhanbad, to find out the feasibility of finding the barrier thickness and the water logged area in underground coal mines. The area under study forms part of Jharia coalfield in Dhanbad district, Jharkhand state. The coal bearing rocks of Barakar Formation of Lower Permian age (Gondwana period) occur in the area under a thin cover (10 m to15 m) of soil and or alluvium. Coal bearing Barakar Formations consist mainly of sandstone of varying grain size, intercalation of shale and sandstone, grey and carbonaceous-shale and coal seams.Since the water saturation reduces the resistivity of a formation to a large extent, water filled voids and old coal workings are expected to have significant resistivity contrast with the surrounding host rock. Hence, ERI technique was applied in such an environment as this technique uses high-density data acquisition both laterally and vertically by using multiple number of electrodes. Along with ERI, mise-a-la-masse (also called charged body) technique was also employed at one of the promising sites to find out the connectivity of water logged areas and also detection of these old workings from the surface measurements was analyzed. The interpreted 2D resistivity sections have clearly indicated the water bearing zone(s) along the profile which was well confirmed with the existing water level in the nearby borewells. On the other hand, this technique did not identify the size of the coal pillar and gallery (air filled voids), which might be due to the small size of the voids (i.e. about 2 m × 2 m) below a depth of 15m and more but have indicated altogether as a high resistive zone ranging from 600-1000 Ohm-m.
Keywords
Coal Seams, Water Filled Voids, Electrical Resistivity Imaging, Jharia Coalfield, Dhanbad, Jharkhand.
References
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