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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 187616, 9 pages
http://dx.doi.org/10.1155/2015/187616
Research Article

Experimental Researches on Long-Term Strength of Granite Gneiss

Lin Liu1,2 and Weiya Xu1,2

1Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
2Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China

Received 9 June 2015; Accepted 6 September 2015

Academic Editor: Fernando Lusquiños

Copyright © 2015 Lin Liu and Weiya Xu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is important to confirm the long-term strength of rock materials for the purpose of evaluating the long-term stability of rock engineering. In this study, a series of triaxial creep tests were conducted on granite gneiss under different pore pressures. Based on the test data, we proposed two new quantitative methods, tangent method and intersection method, to confirm the long-term strength of rock. Meanwhile, the isochronous stress-strain curve method was adopted to make sure of the accuracy and operability of the two new methods. It is concluded that the new methods are suitable for the study of the long-term strength of rock. The effect of pore pressure on the long-term strength of rock in triaxial creep tests is also discussed.