Verma, H.K. and Singh, M. and Samadhiya , N.K. and Prasad, V.V.R. (2014) Investigation of excavation damage zone in Himalayan tunnel. journals of mines metals and fuels, 62 (7). pp. 196-200. ISSN 0022-2755

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Abstract

Expreiments were carried out to measure blast induced damage in 99 MW L7T-Singoli-Bhatwari hydroelectric power project, Rudraprayag. Repetitive NX size rock core up to 5.0 m depth were taken from side wall and face with triple trube core barrel drill. The rock samples were tested using ultrasonic techniques. Ultrasonic tests on NX size core reveal that the 2.0 m of the zone surrounding the opening are adversely affect by the tunnel excavation blasting process. The ultrasonic velocities reduce to 70% of the average values in the initial 0.5 m from the excavation line. It is also observed that characterization of blast induced damage zone beyond 2.0 m with ultrasonic techniques is inconclusive due to natural variation in ultrasonic velocity on account of the anisotropy of the rock

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	13 Jan 2020 06:24
Last Modified:	13 Jan 2020 06:24
URI:	http://cimfr.csircentral.net/id/eprint/2145

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