Himanshu, Vivek K and Roy, M.P. and Kaushik, Amar P and Kushwaha, Saurabh (2020) Directional Controlled Blasting for Extraction of Composite Strata in An Indian Coal Mine. Journal of Mining Technologies and Mineralogy, 1 (1).
Full text not available from this repository. (Request a copy)Abstract
Extraction of thin coal seam and associated overburden using drilling and blasting is a cost expansive task. In such scenario, the separate excavation of each stratum needs blasting of shallow deep holes. The shallow deep hole blasting comes with many associated safety and productivity threats such as – flyrock ejection, frequent marching of machinery, extra manpower effort etc. The simultaneous excavation of thin strata with overburden can be an alternative to this problem. However, simultaneous excavation may lead to the problems of dilution. Accordingly, a directional controlled blasting is a need to restrict the throw of the blasted material from each stratum within the desired distance. This paper has dealt with the methodology to excavate two numbers of coal seams with two layers of associated overburden simultaneously. The scientific methodology consisting of near field vibration assessment and empirical formulation based approach was used to design the blast. The optimal burden and charge factor estimation were carried out for different strata using this approach. The charging quantification and delay sequence arrangements were designed to suit the requirements of material movements. The blast for the excavation of composite strata was conducted using the devised blasting patterns. The blasting outputs were excellent in terms of the throw of the blasted materials and fragmentation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Composite Strata; Dilution Control; Throw Optimization; Coal Seam; Blast Design |
| Subjects: | Blasting |
| Divisions: | UNSPECIFIED |
| Depositing User: | Mr. B. R. Panduranga |
| Date Deposited: | 03 Nov 2022 10:09 |
| Last Modified: | 03 Nov 2022 10:09 |
| URI: | http://cimfr.csircentral.net/id/eprint/2545 |
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