An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures
Abstract This study aims to investigate the dynamic mechanical properties and failure mechanisms of red sandstone under varying strain rates and confining pressures, using a modified confining pressure split Hopkinson pressure bar system, focus on investigating the mechanical behavior, stress–strain...
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| Format: | Article |
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Springer
2025-06-01
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| Series: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
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| Online Access: | https://doi.org/10.1007/s40948-025-00985-9 |
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| author | Sheng-Qi Yang Ye Li Wen-Ling Tian Bo-Wen Sun Zhen Zhong Xiao-Shuang Li |
| author_facet | Sheng-Qi Yang Ye Li Wen-Ling Tian Bo-Wen Sun Zhen Zhong Xiao-Shuang Li |
| author_sort | Sheng-Qi Yang |
| collection | DOAJ |
| description | Abstract This study aims to investigate the dynamic mechanical properties and failure mechanisms of red sandstone under varying strain rates and confining pressures, using a modified confining pressure split Hopkinson pressure bar system, focus on investigating the mechanical behavior, stress–strain response, energy dissipation mechanisms, and ultimate failure modes of red sandstone specimens subjected to varying strain rates and confining pressures. The findings reveal that red sandstone exhibited significant plastic yielding, with strain rate effects enhancing its ductility and peak strain. As strain rate and confining pressure increased, parameters for instance elastic modulus, compressive strength, and strain rate strengthening also elevated. Confining pressure constrained deformation, resulting in a decrease in strain rate as confining pressure increased, while maintaining a constant impact velocity. Reflection energy exhibited a positive correlation with strain rate but remained unaffected by confining pressure, suggesting that it was solely influenced by the strain rate. Dissipated energy demonstrated a clear dependence on both confining pressure and strain rate, with an increase observed for both factors. Furthermore, a positive correlation was established between dissipated energy and dynamic compressive strength. Additionally, the failure mode of red sandstone was found to be predominantly shear failure, characterized by core-retaining cones and large fragments, with fragmentation following a fractal distribution law. The fractal dimension of the fragments ranged from 2.20 to 2.80 under active confining pressure. |
| format | Article |
| id | doaj-art-a6b66d4b9f964e099ff7fddb72fef990 |
| institution | DOAJ |
| issn | 2363-8419 2363-8427 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Springer |
| record_format | Article |
| series | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
| spelling | doaj-art-a6b66d4b9f964e099ff7fddb72fef9902025-08-20T03:21:05ZengSpringerGeomechanics and Geophysics for Geo-Energy and Geo-Resources2363-84192363-84272025-06-0111112410.1007/s40948-025-00985-9An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressuresSheng-Qi Yang0Ye Li1Wen-Ling Tian2Bo-Wen Sun3Zhen Zhong4Xiao-Shuang Li5State Key Laboratory of Intelligent Deep Metal Mining and Equipment, School of Civil Engineering, Shaoxing UniversitySchool of Civil Engineering, Hunan University of Science and TechnologyState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and TechnologyState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and TechnologyState Key Laboratory of Intelligent Deep Metal Mining and Equipment, School of Civil Engineering, Shaoxing UniversityState Key Laboratory of Intelligent Deep Metal Mining and Equipment, School of Civil Engineering, Shaoxing UniversityAbstract This study aims to investigate the dynamic mechanical properties and failure mechanisms of red sandstone under varying strain rates and confining pressures, using a modified confining pressure split Hopkinson pressure bar system, focus on investigating the mechanical behavior, stress–strain response, energy dissipation mechanisms, and ultimate failure modes of red sandstone specimens subjected to varying strain rates and confining pressures. The findings reveal that red sandstone exhibited significant plastic yielding, with strain rate effects enhancing its ductility and peak strain. As strain rate and confining pressure increased, parameters for instance elastic modulus, compressive strength, and strain rate strengthening also elevated. Confining pressure constrained deformation, resulting in a decrease in strain rate as confining pressure increased, while maintaining a constant impact velocity. Reflection energy exhibited a positive correlation with strain rate but remained unaffected by confining pressure, suggesting that it was solely influenced by the strain rate. Dissipated energy demonstrated a clear dependence on both confining pressure and strain rate, with an increase observed for both factors. Furthermore, a positive correlation was established between dissipated energy and dynamic compressive strength. Additionally, the failure mode of red sandstone was found to be predominantly shear failure, characterized by core-retaining cones and large fragments, with fragmentation following a fractal distribution law. The fractal dimension of the fragments ranged from 2.20 to 2.80 under active confining pressure.https://doi.org/10.1007/s40948-025-00985-9Dynamic rock mechanicsActive confining pressuresSHPBSPH-FEM coupling simulation |
| spellingShingle | Sheng-Qi Yang Ye Li Wen-Ling Tian Bo-Wen Sun Zhen Zhong Xiao-Shuang Li An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures Geomechanics and Geophysics for Geo-Energy and Geo-Resources Dynamic rock mechanics Active confining pressures SHPB SPH-FEM coupling simulation |
| title | An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| title_full | An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| title_fullStr | An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| title_full_unstemmed | An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| title_short | An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| title_sort | experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures |
| topic | Dynamic rock mechanics Active confining pressures SHPB SPH-FEM coupling simulation |
| url | https://doi.org/10.1007/s40948-025-00985-9 |
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