Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression
To investigate the failure effects of critical fissures in rock specimens subjected to plane strain compression (PSC), five types of internal fissures in rock specimens were designed and twelve PSC tests were conducted for two lithologies based on the discrete element method (DEM). The results were...
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2023-01-01
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| author | Jiaqi Wen Lei Tang Shenghang Zhang Qibing Zhan Yukun Wang |
| author_facet | Jiaqi Wen Lei Tang Shenghang Zhang Qibing Zhan Yukun Wang |
| author_sort | Jiaqi Wen |
| collection | DOAJ |
| description | To investigate the failure effects of critical fissures in rock specimens subjected to plane strain compression (PSC), five types of internal fissures in rock specimens were designed and twelve PSC tests were conducted for two lithologies based on the discrete element method (DEM). The results were analyzed in terms of the fracture mode, data characteristics, and crack evolution. The results indicated the following. (1) The rock samples with a critical fissure under PSC showed a weak face shear fracture mode, which was influenced by lithology, fissure angle, and fissure surface direction. (2) There were four critical expansion points (CEPs) of axial stress of the rocks under PSC, which were the stage signs of rock materials from local damage to complete fracture. The rock-bearing capacity index (RockBCI) was further proposed. (3) The bearing capacity of rock samples with horizontal fissures, fissures whose angles coincided with the fracture surface, and fissures whose surface was perpendicular to the lateral confine direction was the worst; their BCI<sup>2</sup> values were found to be 80.6%, 70.8%, and 56.9% of the rock samples without any fissures, respectively. The delayed fracture situation under PSC was identified and analyzed. (4) The crack evolution followed the unified law of localization, and the fissures in the rocks changed the mode of crack development and the path of the deepening and connecting of crack clusters, as well as affecting the time process from damage to collapse. This research innovatively investigated the behavior characteristics of rock samples with a fissure under PSC, and it qualitatively and quantitatively analyzed the bearing capacity of rock mass from local damage to fracture. |
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| id | doaj.art-85b532e9070a4fe2b92faf876ca3e565 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:50:32Z |
| publishDate | 2023-01-01 |
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| series | Materials |
| spelling | doaj.art-85b532e9070a4fe2b92faf876ca3e5652023-11-30T23:15:42ZengMDPI AGMaterials1996-19442023-01-0116261110.3390/ma16020611Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain CompressionJiaqi Wen0Lei Tang1Shenghang Zhang2Qibing Zhan3Yukun Wang4State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, ChinaDepartment of Materials and Structures, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaDepartment of Materials and Structures, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaTo investigate the failure effects of critical fissures in rock specimens subjected to plane strain compression (PSC), five types of internal fissures in rock specimens were designed and twelve PSC tests were conducted for two lithologies based on the discrete element method (DEM). The results were analyzed in terms of the fracture mode, data characteristics, and crack evolution. The results indicated the following. (1) The rock samples with a critical fissure under PSC showed a weak face shear fracture mode, which was influenced by lithology, fissure angle, and fissure surface direction. (2) There were four critical expansion points (CEPs) of axial stress of the rocks under PSC, which were the stage signs of rock materials from local damage to complete fracture. The rock-bearing capacity index (RockBCI) was further proposed. (3) The bearing capacity of rock samples with horizontal fissures, fissures whose angles coincided with the fracture surface, and fissures whose surface was perpendicular to the lateral confine direction was the worst; their BCI<sup>2</sup> values were found to be 80.6%, 70.8%, and 56.9% of the rock samples without any fissures, respectively. The delayed fracture situation under PSC was identified and analyzed. (4) The crack evolution followed the unified law of localization, and the fissures in the rocks changed the mode of crack development and the path of the deepening and connecting of crack clusters, as well as affecting the time process from damage to collapse. This research innovatively investigated the behavior characteristics of rock samples with a fissure under PSC, and it qualitatively and quantitatively analyzed the bearing capacity of rock mass from local damage to fracture.https://www.mdpi.com/1996-1944/16/2/611fissure of rockfailure analysisplane strain compression (PSC)rock-bearing capacity index (RockBCI)discrete element method (DEM) |
| spellingShingle | Jiaqi Wen Lei Tang Shenghang Zhang Qibing Zhan Yukun Wang Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression Materials fissure of rock failure analysis plane strain compression (PSC) rock-bearing capacity index (RockBCI) discrete element method (DEM) |
| title | Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression |
| title_full | Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression |
| title_fullStr | Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression |
| title_full_unstemmed | Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression |
| title_short | Qualitative and Quantitative Investigations on the Failure Effect of Critical Fissures in Rock Specimens under Plane Strain Compression |
| title_sort | qualitative and quantitative investigations on the failure effect of critical fissures in rock specimens under plane strain compression |
| topic | fissure of rock failure analysis plane strain compression (PSC) rock-bearing capacity index (RockBCI) discrete element method (DEM) |
| url | https://www.mdpi.com/1996-1944/16/2/611 |
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