Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing
A long-term opening problem in geophysics and engineering is the generation mechanism of rock pulverization (e.g., fault gouge) within the shear zone when subjected to triaxial stress environment and dynamic loads. A novel triaxial Hopkinson bar is developed to apply quasi-static triaxial confinemen...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Springer
2024
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| _version_ | 1811139943574011904 |
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| author | Liu, K Hu, W Zhao, J |
| author_facet | Liu, K Hu, W Zhao, J |
| author_sort | Liu, K |
| collection | OXFORD |
| description | A long-term opening problem in geophysics and engineering is the generation mechanism of rock pulverization (e.g., fault gouge) within the shear zone when subjected to triaxial stress environment and dynamic loads. A novel triaxial Hopkinson bar is developed to apply quasi-static triaxial confinement and dynamic loads onto the testing rocks and to measure the energy release from the shearing zone. The results elucidate shear strain-rate threshold (i.e., over 125 s−1) for granite at the triaxial prestress of (10, 10, 10) MPa is required for fine fragments/gouge generation. The effects of shear and normal pre-stresses on dynamic shear strength and surface energy for rock pulverization are investigated, which will help explain fine fragments formed during the high-rate loading events. It is suggested that, except for the quasi-static cumulative slip attrition and multiple dynamic events, rock pulverization or fault gouge could be generated at relatively shallow depths (low geo-stress) in a single dynamic earthquake processes. |
| first_indexed | 2024-09-25T04:14:07Z |
| format | Journal article |
| id | oxford-uuid:923d6eff-554d-4daf-8a80-a7ddd747862e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:14:07Z |
| publishDate | 2024 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:923d6eff-554d-4daf-8a80-a7ddd747862e2024-07-11T20:10:43ZDynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate ShearingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:923d6eff-554d-4daf-8a80-a7ddd747862eEnglishJisc Publications RouterSpringer2024Liu, KHu, WZhao, JA long-term opening problem in geophysics and engineering is the generation mechanism of rock pulverization (e.g., fault gouge) within the shear zone when subjected to triaxial stress environment and dynamic loads. A novel triaxial Hopkinson bar is developed to apply quasi-static triaxial confinement and dynamic loads onto the testing rocks and to measure the energy release from the shearing zone. The results elucidate shear strain-rate threshold (i.e., over 125 s−1) for granite at the triaxial prestress of (10, 10, 10) MPa is required for fine fragments/gouge generation. The effects of shear and normal pre-stresses on dynamic shear strength and surface energy for rock pulverization are investigated, which will help explain fine fragments formed during the high-rate loading events. It is suggested that, except for the quasi-static cumulative slip attrition and multiple dynamic events, rock pulverization or fault gouge could be generated at relatively shallow depths (low geo-stress) in a single dynamic earthquake processes. |
| spellingShingle | Liu, K Hu, W Zhao, J Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title | Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title_full | Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title_fullStr | Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title_full_unstemmed | Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title_short | Dynamic Pulverization of Rock Under Triaxial Static-Stress and High-Rate Shearing |
| title_sort | dynamic pulverization of rock under triaxial static stress and high rate shearing |
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