Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

In India, after nationalization of coal mines, the coal production has been enormously increased with the drastic increased in demand. Fulfilment of demand is met by opening up the highly mechanized surface mines. In the past, the Indian surface coal mines were, in general, using conventional drilling-blasting technique with conjugation of a number of combinations like shovel-dumper, dragline, FEL-dumper etc. In the overburden benches, large scale blasting generated ground vibrations leading to structural damage. In order to control this, reduction in maximum charge per delay has got the importance in the mind of the mining as well as geotechnical engineers. This reduction of charge per delay, have deployed either by using more number of delays in each hole or sometimes by using hole to hole delay. This concept was used and the study was conducted in the Indian surface coal mines and the detailed investigation was carried out and comparison on the ground vibration was made between hole to hole delay blasting and row blasting. The vibrations were carefully measured with the help of two Minimates plus Seismographs of Instantel Inc. Predictor equations have been established to arrive at the vibration levels considering both maximum charge per delay and total charge per delay. Calculation of scaled distance has got added place. From field investigations, it has been observed that the vibration level is lesser for the row to row blasting than the hole to hole blasting for a same scaled distance. The result shows the reverse trend of the earlier researchers dealing with blasting operations. To explain this typical result in proper justification a large number of case studies were conducted and the geological parameters are simulated with the scaled distance, maximum charge per delay and total charge blasted. Accordingly, a simulation package is developed which can help the practicing engineers dealing with this problems.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Ground Vibration — Unique Case Studies in Indian Coal Mines

Arlington, Virginia

In India, after nationalization of coal mines, the coal production has been enormously increased with the drastic increased in demand. Fulfilment of demand is met by opening up the highly mechanized surface mines. In the past, the Indian surface coal mines were, in general, using conventional drilling-blasting technique with conjugation of a number of combinations like shovel-dumper, dragline, FEL-dumper etc. In the overburden benches, large scale blasting generated ground vibrations leading to structural damage. In order to control this, reduction in maximum charge per delay has got the importance in the mind of the mining as well as geotechnical engineers. This reduction of charge per delay, have deployed either by using more number of delays in each hole or sometimes by using hole to hole delay. This concept was used and the study was conducted in the Indian surface coal mines and the detailed investigation was carried out and comparison on the ground vibration was made between hole to hole delay blasting and row blasting. The vibrations were carefully measured with the help of two Minimates plus Seismographs of Instantel Inc. Predictor equations have been established to arrive at the vibration levels considering both maximum charge per delay and total charge per delay. Calculation of scaled distance has got added place. From field investigations, it has been observed that the vibration level is lesser for the row to row blasting than the hole to hole blasting for a same scaled distance. The result shows the reverse trend of the earlier researchers dealing with blasting operations. To explain this typical result in proper justification a large number of case studies were conducted and the geological parameters are simulated with the scaled distance, maximum charge per delay and total charge blasted. Accordingly, a simulation package is developed which can help the practicing engineers dealing with this problems.