Himanshu, Vivek Kumar and Mishra, A. K and Roy, M. P. and Shankar, Ravi and Priyadarshi, Vivek and Vishwakarma, A. K. (2023) Influence of Joint Orientation and Spacing on Induced Rock Mass Damage due to Blasting in Limestone Mines. Mining, Metallurgy & Exploration, 40. pp. 2349-2359.

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Abstract

The nature and orientation of joints in rock strata affect the damage pattern under explosive loading. Most of the limestone deposits in India are found with severity of joints. Categorically, these joints may have variable orientations such as dipping out of the blast face, inside the face, horizontally or having strike parallel to the face. The damage pattern under the varying category of orientation will be different. Accordingly, a numerical model in Ansys-Explicit Dynamics was prepared to compare the damages of rock mass under different joint orientations. The physical nature of a joint reflects frictional and stiffness behaviour. Accordingly, the damages have been compared under bonded and frictional nature of joints. The output damage pattern from the model has been validated on the basis of blastability index proposed by Lilly. Different limestone mines in India show different nature of jointing in their rock strata. Accordingly, the blasting outputs from three different limestone mines, viz. Rawan limestone mine, Sagmania and Birhauli limestone mine and Injepalli limestone mine, have been compared along with their blast design parameters and the nature of joint. The comparative results show that the closely spaced horizontal joints support maximum in burden movement and rock fragmentation due to blast.

Item Type:	Article
Uncontrolled Keywords:	Joint orientation Frictional joints Blast-induced damage Limestone mine Numerical simulation
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	09 Apr 2024 08:23
Last Modified:	09 Apr 2024 08:23
URI:	http://cimfr.csircentral.net/id/eprint/2719

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