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Rock Mechanics and Rock Engineering
Published in: Rock Mechanics and Rock Engineering 3/2015

01-05-2015 | Original Paper

An Analysis of Consolidation Grouting Effect of Bedrock Based on its Acoustic Velocity Increase

Authors: Ming Chen, Wen-bo Lu, Wen-ju Zhang, Peng Yan, Chuang-bing Zhou

Published in: Rock Mechanics and Rock Engineering | Issue 3/2015

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Abstract

Acoustic velocity is an important parameter to evaluate the mechanical properties of fractured rock masses. Based on the in situ acoustic velocity measurement data of ~20 hydropower stations in China, we assessed the acoustic velocity increase of rock masses as a result of consolidation grouting in different geological conditions, such as fault sites, weathered areas and excavation-induced damage zones. We established an empirical relationship between the acoustic velocity of rock masses before and after consolidation grouting, and examined the correlation between acoustic velocity and deformation modulus. A case study is presented about a foundation consolidation grouting project for an intake tower of Pubugou Hydropower Station. The results show that different types of rock masses possess distinct ranges for resultant acoustic velocity increase by consolidation grouting. Under a confidence interval of 95 %, the ranges of the increasing rate of acoustic velocity in a faulted zone, weathered zone, and excavation-induced damage zone are observed to be 12.7–43.1, 12.3–31.2, and 6.9–14.5 %, respectively. The acoustic velocity before grouting and its increasing rate can be used to predict the effectiveness of consolidation grouting.
previous article The Importance of Geochemical Parameters and Shale Composition on Rock Mechanical Properties of Gas Shale Reservoirs: a Case Study From the Kockatea Shale and Carynginia Formation From the Perth Basin, Western Australia
next article Study on the Failure Mechanism of Basalts with Columnar Joints in the Unloading Process on the Basis of an Experimental Cavity

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Metadata
Title
An Analysis of Consolidation Grouting Effect of Bedrock Based on its Acoustic Velocity Increase
Authors
Ming Chen
Wen-bo Lu
Wen-ju Zhang
Peng Yan
Chuang-bing Zhou
Publication date
01-05-2015
Publisher
Springer Vienna
Published in
Rock Mechanics and Rock Engineering / Issue 3/2015
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-014-0624-7

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