Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression
Isolated pillars in underground mines are subjected to uniaxial stress, and the load bearing cross-section of pillars is commonly rectangularly shaped. In addition, the uniaxial compression test (UCT) is widely used for determining the basic mechanical properties of rocks and revealing the mechanism...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | International Journal of Mining Science and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268622000040 |
| _version_ | 1811332198791380992 |
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| author | Kun Du Xuefeng Li Rui Su Ming Tao Shizhan Lv Jia Luo Jian Zhou |
| author_facet | Kun Du Xuefeng Li Rui Su Ming Tao Shizhan Lv Jia Luo Jian Zhou |
| author_sort | Kun Du |
| collection | DOAJ |
| description | Isolated pillars in underground mines are subjected to uniaxial stress, and the load bearing cross-section of pillars is commonly rectangularly shaped. In addition, the uniaxial compression test (UCT) is widely used for determining the basic mechanical properties of rocks and revealing the mechanism of isolated pillar disasters under unidimensional stress. The shape effects of rock mechanical properties under uniaxial compression are mainly quantitatively reflected in the specific shape ratios of rocks. Therefore, it is necessary to study the detailed shape ratio effects on the mechanical properties of rectangular prism rock specimens and isolated pillars under uniaxial compressive stress. In this study, granite, marble and sandstone rectangular prism specimens with various height to width ratios (r) and width to thickness ratios (u) were prepared and tested. The study results show that r and u have a great influence on the bearing ability of rocks, and thin or high rocks have lower uniaxial compressive strength. Reducing the level of r can enhance the u effect on the strength of rocks, and increasing the level of u can enhance the r effect on the strength of rocks. The lateral strain on the thickness side of the rock specimen is larger than that on the width side, which implies that crack growth occurs easily on the thickness side. Considering r and u, a novel strength prediction model of isolated pillars was proposed based on the testing results, and the prediction model was used for the safety assessment of 179 isolated pillars in the Xianglu Mountain Tungsten Mine. |
| first_indexed | 2024-04-13T16:32:19Z |
| format | Article |
| id | doaj.art-543011398b94429283c85b2df735eb35 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-04-13T16:32:19Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-543011398b94429283c85b2df735eb352022-12-22T02:39:31ZengElsevierInternational Journal of Mining Science and Technology2095-26862022-03-01322347362Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compressionKun Du0Xuefeng Li1Rui Su2Ming Tao3Shizhan Lv4Jia Luo5Jian Zhou6School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaHunan Research Institute for Nonferrous Metals CO., LTD, Changsha 410100, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, China; Corresponding author.Isolated pillars in underground mines are subjected to uniaxial stress, and the load bearing cross-section of pillars is commonly rectangularly shaped. In addition, the uniaxial compression test (UCT) is widely used for determining the basic mechanical properties of rocks and revealing the mechanism of isolated pillar disasters under unidimensional stress. The shape effects of rock mechanical properties under uniaxial compression are mainly quantitatively reflected in the specific shape ratios of rocks. Therefore, it is necessary to study the detailed shape ratio effects on the mechanical properties of rectangular prism rock specimens and isolated pillars under uniaxial compressive stress. In this study, granite, marble and sandstone rectangular prism specimens with various height to width ratios (r) and width to thickness ratios (u) were prepared and tested. The study results show that r and u have a great influence on the bearing ability of rocks, and thin or high rocks have lower uniaxial compressive strength. Reducing the level of r can enhance the u effect on the strength of rocks, and increasing the level of u can enhance the r effect on the strength of rocks. The lateral strain on the thickness side of the rock specimen is larger than that on the width side, which implies that crack growth occurs easily on the thickness side. Considering r and u, a novel strength prediction model of isolated pillars was proposed based on the testing results, and the prediction model was used for the safety assessment of 179 isolated pillars in the Xianglu Mountain Tungsten Mine.http://www.sciencedirect.com/science/article/pii/S2095268622000040Uniaxial compression testIsolated pillarRectangular prismShape ratio effectFailure property |
| spellingShingle | Kun Du Xuefeng Li Rui Su Ming Tao Shizhan Lv Jia Luo Jian Zhou Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression International Journal of Mining Science and Technology Uniaxial compression test Isolated pillar Rectangular prism Shape ratio effect Failure property |
| title | Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| title_full | Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| title_fullStr | Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| title_full_unstemmed | Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| title_short | Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| title_sort | shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression |
| topic | Uniaxial compression test Isolated pillar Rectangular prism Shape ratio effect Failure property |
| url | http://www.sciencedirect.com/science/article/pii/S2095268622000040 |
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