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Article: Shear behavior and off-fault damage of saw-cut smooth and tension-induced rough joints in granite
| Title | Shear behavior and off-fault damage of saw-cut smooth and tension-induced rough joints in granite |
|---|---|
| Authors | |
| Keywords | Micro-cracks Off-fault damage Planar joint Rough joint Shear behavior |
| Issue Date | 7-Sep-2023 |
| Publisher | Elsevier |
| Citation | Journal of Rock Mechanics and Geotechnical Engineering, 2023 How to Cite? |
| Abstract | The damage of rock joints or fractures upon shear includes the surface damage occurring at the contact asperities and the damage beneath the shear surface within the host rock. The latter is commonly known as off-fault damage and has been much less investigated than the surface damage. The main contribution of this study is to compare the results of direct shear tests conducted on saw-cut planar joints and tension-induced rough granite joints under normal stresses ranging from 1 MPa to 50 MPa. The shear-induced off-fault damages are quantified and compared with the optical microscope observation. Our results clearly show that the planar joints slip stably under all the normal stresses except under 50 MPa, where some local fractures and regular stick-slip occur towards the end of the test. Both post-peak stress drop and stick-slip occur for all the rough joints. The residual shear strength envelopes for the rough joints and the peak shear strength envelope for the planar joints almost overlap. The root mean square (RMS) of asperity height for the rough joints decreases while it increases for the planar joint after shear, and a larger normal stress usually leads to a more significant decrease or increase in RMS. Besides, the extent of off-fault damage (or damage zone) increases with normal stress for both planar and rough joints, and it is restricted to a very thin layer with limited micro-cracks beneath the planar joint surface. In comparison, the thickness of the damage zone for the rough joints is about an order of magnitude larger than that of the planar joints, and the coalesced micro-cracks are generally inclined to the shear direction with acute angles. The findings obtained in this study contributes to a better understanding on the frictional behavior and damage characteristics of rock joints or fractures with different roughness. |
| Persistent Identifier | http://hdl.handle.net/10722/338445 |
| ISSN | 2023 Impact Factor: 9.4 2023 SCImago Journal Rankings: 2.154 |
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Meng, Fanzhen | - |
| dc.contributor.author | Wang, Feili | - |
| dc.contributor.author | Wong, Louis Ngai Yuen | - |
| dc.contributor.author | Song, Jie | - |
| dc.contributor.author | Li, Muzi | - |
| dc.contributor.author | Zhang, Chuanqing | - |
| dc.contributor.author | Zhang, Liming | - |
| dc.date.accessioned | 2024-03-11T10:28:57Z | - |
| dc.date.available | 2024-03-11T10:28:57Z | - |
| dc.date.issued | 2023-09-07 | - |
| dc.identifier.citation | Journal of Rock Mechanics and Geotechnical Engineering, 2023 | - |
| dc.identifier.issn | 1674-7755 | - |
| dc.identifier.uri | http://hdl.handle.net/10722/338445 | - |
| dc.description.abstract | <p>The damage of rock <a href="https://www.sciencedirect.com/topics/engineering/joints-structural-components" title="Learn more about joints from ScienceDirect's AI-generated Topic Pages">joints</a> or fractures upon shear includes the surface damage occurring at the <a href="https://www.sciencedirect.com/topics/engineering/asperity-contact" title="Learn more about contact asperities from ScienceDirect's AI-generated Topic Pages">contact asperities</a> and the damage beneath the shear surface within the host rock. The latter is commonly known as off-fault damage and has been much less investigated than the surface damage. The main contribution of this study is to compare the results of <a href="https://www.sciencedirect.com/topics/engineering/direct-shear-test" title="Learn more about direct shear tests from ScienceDirect's AI-generated Topic Pages">direct shear tests</a> conducted on saw-cut planar joints and tension-induced rough granite joints under normal stresses ranging from 1 MPa to 50 MPa. The shear-induced off-fault damages are quantified and compared with the <a href="https://www.sciencedirect.com/topics/engineering/optical-microscope" title="Learn more about optical microscope from ScienceDirect's AI-generated Topic Pages">optical microscope</a> observation. Our results clearly show that the planar joints slip stably under all the normal stresses except under 50 MPa, where some local fractures and regular stick-slip occur towards the end of the test. Both post-peak stress drop and stick-slip occur for all the rough joints. The residual shear strength envelopes for the rough joints and the peak shear strength envelope for the planar joints almost overlap. The <a href="https://www.sciencedirect.com/topics/engineering/root-mean-square" title="Learn more about root mean square from ScienceDirect's AI-generated Topic Pages">root mean square</a> (RMS) of <a href="https://www.sciencedirect.com/topics/engineering/asperity-height" title="Learn more about asperity height from ScienceDirect's AI-generated Topic Pages">asperity height</a> for the rough joints decreases while it increases for the planar joint after shear, and a larger normal stress usually leads to a more significant decrease or increase in RMS. Besides, the extent of off-fault damage (or damage zone) increases with normal stress for both planar and rough joints, and it is restricted to a very thin layer with limited micro-cracks beneath the planar joint surface. In comparison, the thickness of the damage zone for the rough joints is about an order of magnitude larger than that of the planar joints, and the coalesced micro-cracks are generally inclined to the shear direction with acute angles. The findings obtained in this study contributes to a better understanding on the <a href="https://www.sciencedirect.com/topics/engineering/frictional-behavior" title="Learn more about frictional behavior from ScienceDirect's AI-generated Topic Pages">frictional behavior</a> and damage characteristics of rock joints or fractures with different roughness.<br></p> | - |
| dc.language | eng | - |
| dc.publisher | Elsevier | - |
| dc.relation.ispartof | Journal of Rock Mechanics and Geotechnical Engineering | - |
| dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
| dc.subject | Micro-cracks | - |
| dc.subject | Off-fault damage | - |
| dc.subject | Planar joint | - |
| dc.subject | Rough joint | - |
| dc.subject | Shear behavior | - |
| dc.title | Shear behavior and off-fault damage of saw-cut smooth and tension-induced rough joints in granite | - |
| dc.type | Article | - |
| dc.description.nature | published_or_final_version | - |
| dc.identifier.doi | 10.1016/j.jrmge.2023.07.008 | - |
| dc.identifier.scopus | eid_2-s2.0-85171972270 | - |
| dc.identifier.eissn | 2589-0417 | - |
| dc.identifier.issnl | 1674-7755 | - |