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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/21023
Title: Blast induced rock mass damage around tunnels
Authors: Verma H.K.
Samadhiya, Narendra Kumar
Singh, Mahendra
Goel R.K.
Singh P.K.
Published in: Tunnelling and Underground Space Technology
Abstract: Drilling and blasting is a preferred method of rock excavation world-wide due to low initial investment, cheap explosive energy, easy acceptability among the blasting engineers and, possibility to deal with different shapes and sizes of openings. Although, drill and blast method has witnessed significant technological advancements, it has inherent disadvantage of deteriorating surrounding rock mass due to development of network of fine cracks in it leading to safety and stability problems. The damage in the peripheral rock mass culminates in the form of overbreak and damaged zone beyond overbreak. In some cases the projects cost has increased more than 15% because of overbreak. Although significant efforts have been made to assess damage to the surrounding rock mass using different methods, the solution based on easily available site parameters is still lacking. Authors have carried out field investigations at five different tunnels located in Himalaya, India to study blast induced damage for wide range of rock mass quality Q values (0.03–17.8). In addition to Q, specific charge, perimeter charge factor, maximum charge per delay, advancement and confinement factors have also been used. Data sets of 113 experimental blasts are collected from the five tunnel sites. All the parameters, easily available to the site engineers, have been used for developing an empirical correlation to estimate the rock mass damage around the tunnel, which is discussed in the paper. The proposed empirical correlation has been validated using ultrasonic tests on rock core samples obtained from one of the experimental location. © 2017
Citation: Tunnelling and Underground Space Technology, 71: 149-158
URI: https://doi.org/10.1016/j.tust.2017.08.019
http://repository.iitr.ac.in/handle/123456789/21023
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: Attenuation characteristics
Blasting
Maximum charge per delay
Perimeter charge factor
Rock mass damage
Vibration
ISSN: 8867798
Author Scopus IDs: 57204684362
6506534111
57421997600
35783110100
57208536559
Author Affiliations: Verma, H.K., CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, 826015, India
Samadhiya, N.K., Indian Institute of Technology Roorkee, Roorkee, 247667, India
Singh, M., Indian Institute of Technology Roorkee, Roorkee, 247667, India
Goel, R.K., CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, 826015, India
Singh, P.K., CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, 826015, India
Funding Details: Authors express their gratitude to the project authorities of National Thermal Power Corporation Ltd, New Delhi, THDC India Ltd., Rishikesh, M/s L&T, Tapovan-Vishnugaad Hydropower Project. Team of engineers and geologists from L&T Singoli-Bhatwari Hydropower Project have also provided great help in field investigations. Their contribution is also thankfully acknowledged. National City Corporation; DBT India Alliance
Corresponding Author: Verma, H.K.; CSIR-Central Institute of Mining and Fuel Research, Barwa Road, India; email: drharsh77@gmail.com
Appears in Collections:Journal Publications [CE]

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