.Himanshu, Vivek K. and .Roy, M.P and Vishwakarma, Ashish K. and Singh, P.K. (2021) Numerical simulation based approach for assessment of blast induced deformation pattern in slot raise excavation. International Journal of Rock Mechanics and Mining Sciences , 144 ( 10481). ISSN 1365-1609

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The excavation of long-hole slot raises in a single lift comes with the difficulties of face jamming, insufficient face movement and boulder formation. The main reasons behind these problems are improper blast design, presence of geological discontinuities or inaccuracy in drilling. The proper blast design to get uniform breakage pattern for slot raise excavation consists of design of drilling, charging and delay parameters. This paper has discussed the numerical simulation based approach for assessment of blast induced deformation pattern in slot raise blasting. The numerical models with different variants of slot raise blast design was made for this purpose in Ansys-Explicit Dynamics. The model was given tested rock mass properties data of Rampura Agucha underground Lead–Zinc mine. The deformation pattern output for these variants were analysed. The analysis of deformation pattern suggests that the ratio of number of reamer holes and blast holes have more impact on deformation pattern. The more uniform deformation contour was observed for the cut hole blast with six reamer holes and five blast holes for the experimental site. The deformation pattern output for excavation of periphery holes were also analysed. The drilling pattern and delay timing for the slot raise blast was decided on the basis of model output. The experimental trials at the mine was taken on the basis of revised blasting pattern. The face jamming has been reduced with revised pattern. The blasting pattern has also been advantageous in reducing overall blasting cost by reducing the number of drill holes in cut portion.

Item Type: Article
Uncontrolled Keywords: StopingSlot raiseReamer holeNumerical simulationBlast induced damageDeformation
Subjects: Blasting
Depositing User: Mr. B. R. Panduranga
Date Deposited: 30 Aug 2021 11:51
Last Modified: 30 Aug 2021 11:51
URI: http://cimfr.csircentral.net/id/eprint/2404

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