An Advanced Shear Strength Criterion for Rock Discontinuities Considering Size and Low Shear Rate
Open Access
- 13 June 2020
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 10 (12), 4095
- https://doi.org/10.3390/app10124095
Abstract
The shear strength of the rock discontinuities under different shear rates is of great importance to evaluate the stability of rock mass engineering, which is remarkably influenced by the size effects induced by both the length and the undulated amplitude of discontinuities. An advanced shear strength criterion taking into account the size and the shear rate simultaneously was proposed. There is an advantage of the dimension unity in terms of the new shear strength criterion in comparison to previous related empirical equations. Additionally, it can be degraded into the International Society for Rock Mechanics (ISRM)-suggested Barton shear strength empirical equation on the peak shear strength of the rock discontinuities. Then, based on a new dynamic direct shear testing device on rock joints, the granite discontinuities with various lengths (200 mm to 1000 mm) and undulated amplitudes (3 mm to 23 mm) were designed to conduct direct shear tests under different low shear rates (0 mm/s to 1 mm/s) to verify the involved empirical equations. It was found that the results predicted by the new shear strength criterion agreed well with the experimental results. It was proved that the new shear strength criterion had a better applicability to characterize the shear strength of the rock discontinuities.Keywords
Funding Information
- National Natural Science Foundation of China (41825018, 41672307, 41902289, 41702345, 41807273)
- China Postdoctoral Science Foundation (2017M620903)
This publication has 45 references indexed in Scilit:
- ARMR, a new classification system for the rating of anisotropic rock massesBulletin of Engineering Geology and the Environment, 2018
- Plastic-strain-dependent strength model to simulate the cracking process of brittle rocks with an existing non-persistent jointEngineering Geology, 2017
- Experimental and numerical study of asperity degradation in the direct shear testEngineering Geology, 2016
- Numerical study on progressive failure of hard rock samples with an unfilled undulate jointEngineering Geology, 2015
- Spatial distribution analysis of landslides triggered by 2008.5.12 Wenchuan Earthquake, ChinaEngineering Geology, 2010
- Source characteristics of long runout rock avalanches triggered by the 2008 Wenchuan earthquake, ChinaJournal of Asian Earth Sciences, 2010
- Constitutive models for rock discontinuities with dilatancy and surface degradationInternational Journal for Numerical and Analytical Methods in Geomechanics, 1987
- Strength, deformation and conductivity coupling of rock jointsInternational Journal of Rock Mechanics and Mining Sciences, 1985
- Strength of jointed rock massesGéotechnique, 1983
- A Model for the Mechanics of Jointed RockJournal of the Soil Mechanics and Foundations Division, 1968