Journal
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
Volume 63, Issue -, Pages 50-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2013.06.007
Keywords
Fully grouted rockbolts; Bolt-grout interface; Analytical approach; Pull-out test; Semi-empirical formulation
Funding
- European Union Research Fund for Coal and Steel (PROSAFECOAL project)
- French Public Agency in Charge of the Management of Radioactive Waste (Andra, MIBOULAND project)
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The bolt-grout interface of fully grouted rockbolts has been studied with the aim of determining its constitutive law. For this purpose, axial loadings acting on the bar have been considered and theoretical and experimental research conducted. The theoretical investigations link the response of the surrounding materials (bolt, grout and ground) to that of the interface, which is not directly accessible. Pull-out tests have been carried out to obtain experimental information. Combining the theoretical developments with the test results, the interface variables can be determined. This procedure proves that, in order to study the bolt-grout interface accurately, the behaviour of the surrounding materials should be well known. From the available data, a semi-empirical formulation of the interface response is proposed. The tangential behaviour suggests that friction is not the only component to the shear stress. The normal response, which is more difficult to ascertain, depends on the bolt profile. (C) 2013 Elsevier Ltd. All rights reserved.
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