Anisotropic Characteristics of Post Sheared Fracture Surface
Publication: International Journal of Geomechanics
Volume 20, Issue 7
Abstract
In this study, a novel servocontrolled direct shear test set-up is proposed for testing of both intact and jointed rocks, and direct shear tests under different conditions were applied on intact sandstone samples and artificial joint samples. A three-dimensional (3D) laser-scanning profilometer system was employed to detect fracture surfaces and obtain the data of point clouds. Also, the anisotropic characteristics of the fracture surfaces were discussed based on data in variograms. Results revealed that crack initiation and propagation were affected by normal stresses in terms of path and mode. Based on the morphology of sheared fracture surfaces, the processes of crack initiation and propagation during shear failures were investigated. Two parameters (C and a) in the variogram were employed to quantify the anisotropy of fracture surfaces: the sill (C) reflects the height of the fluctuation body in fracture surfaces and the range (a) reflects the single fluctuation body and its fluctuation frequency. Additionally, a novel peak shear strength criterion was developed based on anisotropy indexes and it exhibited improved accuracy. Hence, it is concluded that the proposed model is superior to various conventional models.
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Acknowledgments
The authors would like to thank the General Project of the National Natural Science Foundation of China (Grant Numbers 51934004, 51974176, and 51674158) and the Natural Science Foundation of Shandong Province, China (Grant Numbers ZR2019QEE029 and ZR2018ZA0602) for their financial support.
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Published In
International Journal of Geomechanics
Volume 20 • Issue 7 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jul 10, 2019
Accepted: Dec 3, 2019
Published online: Apr 22, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 22, 2020
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