Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling
AbstractThe presence of discontinuities can significantly weaken rock masses, whose shear load-bearing capacity is always dictated by discontinuity failures. The shear response of rock discontinuity has been extensively studied under low loading rate conditions, while the effect of i...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-04-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/1192067/613346/Shear-Response-of-Rough-Rock-Discontinuities |
| _version_ | 1811236196382146560 |
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| author | Feili Wang Bangbiao Wu Shuhong Wang Fanzhen Meng Zhanguo Xiu Chonglang Wang |
| author_facet | Feili Wang Bangbiao Wu Shuhong Wang Fanzhen Meng Zhanguo Xiu Chonglang Wang |
| author_sort | Feili Wang |
| collection | DOAJ |
| description |
AbstractThe presence of discontinuities can significantly weaken rock masses, whose shear load-bearing capacity is always dictated by discontinuity failures. The shear response of rock discontinuity has been extensively studied under low loading rate conditions, while the effect of impact loading on its shear strength was unclear. To address this issue, rock discontinuity samples with quantified surface roughness were tested under six normal stresses (0%, 5%, 10%, 15%, 20%, and 25% of its uniaxial compressive strength) and different loading rates (varying from 100 MPa/ms to 700 MPa/ms) by a novel-designed impact shear testing system. Experimental results show that the impact shear strength is proportional to the loading rate and exhibits significant rate dependence. Moreover, the cohesion is clearly rate-dependent and the friction angle keeps constant during impact loading, which shows obviously different behaviors with those under static loading conditions. Considering the rate effect of the shear strength parameters, the shear strength criterion of rough rock discontinuity under impact loading was established. Furthermore, a statistical constitutive model was proposed by incorporating the Weibull distribution of the shear damage. The successful application of the theoretical model to the experimental data shows that the proposed models can well predict the shear strength and describe the shear damage of rough rock discontinuities under impact loading. |
| first_indexed | 2024-04-12T12:04:44Z |
| format | Article |
| id | doaj.art-910c92c682b7463bab9184333f52fec6 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T12:04:44Z |
| publishDate | 2022-04-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-910c92c682b7463bab9184333f52fec62022-12-22T03:33:44ZengGeoScienceWorldLithosphere1941-82641947-42532022-04-012022Special 1110.2113/2022/1192067Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical ModellingFeili Wang0http://orcid.org/0000-0001-7768-1084Bangbiao Wu1http://orcid.org/0000-0002-1611-8674Shuhong Wang2Fanzhen Meng3http://orcid.org/0000-0002-1401-1654Zhanguo Xiu4http://orcid.org/0000-0001-9295-858XChonglang Wang5http://orcid.org/0000-0001-6160-3620College of Science Qingdao University of Technology Qingdao 266033 China qust.edu.cnState Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil Engineering Tianjin University Tianjin 300072 China tju.edu.cnSchool of Resource and Civil Engineering Northeastern University Shenyang 110819 China neu.edu.cnCollege of Science Qingdao University of Technology Qingdao 266033 China qust.edu.cnSchool of Resource and Civil Engineering Northeastern University Shenyang 110819 China neu.edu.cnDepartment of Civil and Mineral Engineering University of Toronto Toronto Ontario Canada M5S 1A4 utoronto.ca AbstractThe presence of discontinuities can significantly weaken rock masses, whose shear load-bearing capacity is always dictated by discontinuity failures. The shear response of rock discontinuity has been extensively studied under low loading rate conditions, while the effect of impact loading on its shear strength was unclear. To address this issue, rock discontinuity samples with quantified surface roughness were tested under six normal stresses (0%, 5%, 10%, 15%, 20%, and 25% of its uniaxial compressive strength) and different loading rates (varying from 100 MPa/ms to 700 MPa/ms) by a novel-designed impact shear testing system. Experimental results show that the impact shear strength is proportional to the loading rate and exhibits significant rate dependence. Moreover, the cohesion is clearly rate-dependent and the friction angle keeps constant during impact loading, which shows obviously different behaviors with those under static loading conditions. Considering the rate effect of the shear strength parameters, the shear strength criterion of rough rock discontinuity under impact loading was established. Furthermore, a statistical constitutive model was proposed by incorporating the Weibull distribution of the shear damage. The successful application of the theoretical model to the experimental data shows that the proposed models can well predict the shear strength and describe the shear damage of rough rock discontinuities under impact loading.https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/1192067/613346/Shear-Response-of-Rough-Rock-Discontinuities |
| spellingShingle | Feili Wang Bangbiao Wu Shuhong Wang Fanzhen Meng Zhanguo Xiu Chonglang Wang Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling Lithosphere |
| title | Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling |
| title_full | Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling |
| title_fullStr | Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling |
| title_full_unstemmed | Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling |
| title_short | Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling |
| title_sort | shear response of rough rock discontinuities subjected to impact loading experimental study and theoretical modelling |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/1192067/613346/Shear-Response-of-Rough-Rock-Discontinuities |
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