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Sastry, V. R.
- Generation and Accuracy Assessment of Digital Elevation Model Using Digital Photogrammetry and Differential Global Positioning System Techniques
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Authors
Affiliations
1 Department of Mining Engineering, NITK, Surathkal, Mangalore-575025, IN
2 Department of Civil Engineering, NITK, Surathkal, Mangalore-575025, IN
1 Department of Mining Engineering, NITK, Surathkal, Mangalore-575025, IN
2 Department of Civil Engineering, NITK, Surathkal, Mangalore-575025, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 122-133Abstract
Blasting can be considered as the most crucial process in an opencast mine. It is therefore important for mining engineers to understand the effect of geological discontinuities and blast design parameters on the results of blasting. Bench height and burden are very important parameters affecting stiffness of bench. Joints alter the results of blasting, by making explosive energy utilization ineffective. Modern tools like high speed videography reveal many aspects of fragmentation process, which otherwise are difficult to visualize and understand. An attempt is made through this paper to present some of the research results of model scale studies, coupled with field study results related to bench height and joints in order to improve blast results.Keywords
Rock Fragmentation, Geological Discontinuities, Bench Height, Burden, Joint Orientation, Gas Energy, Shock Energy, High Speed Videography.- Analysis of Surface Subsidence and Relative Movements of Underground Rock Strata over an Inclined Longwall Panel
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Authors
Affiliations
1 General Manager (Retired), SCCL, Kothagudem – 507101, Telangana, India;, IN
2 Deputy Manager, SCCL, Kothagudem – 507101, Telangana, India;, IN
3 Professor, HAG, Department of Mining Engineering, NITK Surathkal - 575025, Karnataka, India;, IN
1 General Manager (Retired), SCCL, Kothagudem – 507101, Telangana, India;, IN
2 Deputy Manager, SCCL, Kothagudem – 507101, Telangana, India;, IN
3 Professor, HAG, Department of Mining Engineering, NITK Surathkal - 575025, Karnataka, India;, IN
Source
Journal of Mines, Metals and Fuels, Vol 70, No 9 (2022), Pagination: 484 - 491Abstract
Subsidence monitoring and analysis is an integral part of longwall operation. It provides an assessment of the effect of mining on the surface. In this study, subsidence data is recorded periodically over a longwall panel of 250m of face length and 2333m of gate roadway length for a duration of 12 months. The working seam is inclined at 10 degrees (1 in 5.5) towards tailgate side. Based on the measured data, a profile function is derived indicating vertical ground movement over the major section of the longwall panel. The bed separation of layers in the roof rock is also measured by installing Multi-Point Borehole Extensometer (MPBX) at the centre of the longwall panel and its results are correlated with those of subsidence monitored data. It is found from the analysis of subsidence and MPBX data that there is a good correlation between the bed separation sequence and the subsidence over longwall panel.Keywords
Longwall, Multipoint Borehole Extensometer, Profile Function, SubsidenceReferences
- Asadi, A., Shakhriar, K. & Goshtasbi K. (2004). Profiling function for surface subsidence prediction in mining inclined coal seams. Journal of Mining Science, 40. https:// doi.org/10.1023/B:JOMI.0000047856.91826.76
- John Loui Porathur & Chandrani P. Verma. (2017). Subsidence prediction studies and field validation over Panel LW1 in seam I at Adriyala Longwall Project, SCCL. Report of Scientific Study of Adriyala Longwall Project by CSIR-CIMFR.
- Mine Subsidence Engineering Consultants. (2007). Introduction to Longwall Mining and Subsidence. Revision A Report.