Tensile strength of large-scale incipient rock joints : a laboratory investigation
Author
Shang, Junlong
West, L. J.
Hencher, S. R.
Zhao, Zhiye
Date of Issue
2017School
School of Civil and Environmental Engineering
Version
Published version
Abstract
In this paper, a testing methodology was developed in the laboratory to measure the tensile strength of large-scale incipient rock joints. In the test, an expansive grout was used to develop the tensile force. Each test comprises two phases: Phase i test and Phase ii test. The Phase i test identified sample failure time, while the Phase ii test measured the corresponding tensile force arising from the expansive grout. Ostensibly homogeneous rock samples without incipient joints were firstly tested to establish the methodology. Tensile strength of block samples containing incipient rock joints was then measured using the established testing scheme. The test results have been compared with those obtained from conventional Brazilian and uniaxial tension tests as suggested by ISRM. The proposed approach is capable of giving a measure of tensile strength of large-scale incipient rock joints, although somewhat smaller strength than that from the standard approaches was occasionally measured in the preliminary tests on ostensibly homogeneous samples. Effects of stress concentration, sample scale, loading rate and expansive tensile force on the testing results were discussed. Furthermore, this simple and practical testing scheme is proposed for the measurement of the in situ tensile strength of rock and incipient discontinuities in the field, which if successful will provide a more scientific guidance on the rock mass classification and engineering design.
Subject
Expansive Grout
Incipient Rock Joints
Engineering::Civil engineering
Incipient Rock Joints
Engineering::Civil engineering
Type
Journal Article
Series/Journal Title
Acta Geotechnica
Rights
© 2017 The Author(s). Published by Springer Berlin Heidelberg. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Collections
http://dx.doi.org/10.1007/s11440-017-0620-7
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