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Measurements of mechanical properties of discontinuities by rheological tests

FENG LI1,2, XUAN WANG3,* , BINBIN SHI4, YONGFEI XUE1, KECHAO ZHAO1

Affiliation

  1. School of Civil Engineering, Henan Institute of Engineering, Zhengzhou, Henan 451191, China
  2. Henan Huaan Construction Co., Ltd. Taihang Road No. 48, Linzhou City, Henan 456550, China
  3. School of Civil Engineering , Henan Polytechnic University, Jiaozuo, Henan 454000, China
  4. School of Arts and Design, Henan Institute of Engineering, Zhengzhou, Henan 451191, China

Abstract

The stress state, deformation and failure characteristics of rock discontinuity are constantly changing over time under long-term loads, exhibiting significant time effect. The time-dependent deformation and long-term strength of the rock mass are controlled significantly by the creep mechanical behavior of the discontinuities, and the study of creep properties of the rock mass discontinuities is an important area. According to Barton’s standard profiles, this study adopted the first (JRC= 0-2), fourth (JRC = 6-8), and tenth (JRC = 18-20) profiles to prepare the specimens of discontinuity. A series of shear tests and shear creep tests were carried out on the specimens. According to the test results, the failure state and mechanisms of rock discontinuity under shearing condition were analyzed. Furthermore, the method for identifying the long-term strength of discontinuity with different surface roughness was investigated. The long-term strength of rock discontinuity was compared to its instantaneous strength, and some valuable conclusions were obtained..

Keywords

Discontinuity, Creep, Long-term strength.

Submitted at: Jan. 6, 2015
Accepted at: April 5, 2016

Citation

FENG LI, XUAN WANG, BINBIN SHI, YONGFEI XUE, KECHAO ZHAO, Measurements of mechanical properties of discontinuities by rheological tests, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 3-4, pp. 407-413 (2016)