Shear relaxation characteristics of rock joints under stepwise loadings

Ang Liu; Guanghui Tian; Qingzhao Zhang; Wenli Lin; Jingcai Jiang

doi:10.1016/j.crme.2018.09.001

Shear relaxation characteristics of rock joints under stepwise loadings

Ang Liu ^1,² ; Guanghui Tian ³ ; Qingzhao Zhang ⁴ ; Wenli Lin ⁵ ; Jingcai Jiang ²

¹ Department of Geological Engineering, Nanjing Tech University, Nanjing 211800, China
² Department of Civil and Environmental Engineering, Tokushima University, Tokushima 770-0814, Japan
³ Department of Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China
⁴ Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China
⁵ Department of Geotechnical Engineering, The University of Tokyo, Tokyo 113-8654, Japan

Comptes Rendus. Mécanique, Volume 346 (2018) no. 12, pp. 1179-1191.

Résumé

The stress relaxation characteristic of rock mass is an important aspect of rheology and has important practical significance for rock engineering. In order to investigate the relaxation characteristic of rock joints with different slope ratios and normal stresses, a series of shear stress relaxation tests were conducted on artifical rock joints poured by cement mortar. Test results show that the relaxation curves can be divided into three stages, i.e. instantaneous relaxation stage, attenuation relaxation stage, and stable relaxation stage. Furthermore, the nonlinear Maxwell relaxation equation was obtained by using the relation between the viscosity coefficient and time, and the theoretical curves based on the empirical equation agreed well with the test results. Moreover, the change law of the initial viscosity coefficient was investigated. Accordingly, a stress relaxation method, termed as relaxation stress peak method, was proposed to determine the long-term strength of rock joints.

Reçu le : 2018-04-06
Accepté le : 2018-09-03
Publié le : 2018-11-07

DOI : 10.1016/j.crme.2018.09.001

Mots clés : Rock mass discontinuity, Shear stress, Stress relaxation, Nonlinear Maxwell relaxation equation, Long-term strength

Affiliations des auteurs :

Ang Liu ^{1, 2} ; Guanghui Tian ³ ; Qingzhao Zhang ⁴ ; Wenli Lin ⁵ ; Jingcai Jiang ²

¹ Department of Geological Engineering, Nanjing Tech University, Nanjing 211800, China
² Department of Civil and Environmental Engineering, Tokushima University, Tokushima 770-0814, Japan
³ Department of Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China
⁴ Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China
⁵ Department of Geotechnical Engineering, The University of Tokyo, Tokyo 113-8654, Japan

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     author = {Ang Liu and Guanghui Tian and Qingzhao Zhang and Wenli Lin and Jingcai Jiang},
     title = {Shear relaxation characteristics of rock joints under stepwise loadings},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {1179--1191},
     publisher = {Elsevier},
     volume = {346},
     number = {12},
     year = {2018},
     doi = {10.1016/j.crme.2018.09.001},
     language = {en},
}

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Ang Liu; Guanghui Tian; Qingzhao Zhang; Wenli Lin; Jingcai Jiang. Shear relaxation characteristics of rock joints under stepwise loadings. Comptes Rendus. Mécanique, Volume 346 (2018) no. 12, pp. 1179-1191. doi : 10.1016/j.crme.2018.09.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2018.09.001/

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