Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation
In this study, the uniaxial compression test and the numerical simulation of the twodimensional particle flow code (PFC2D) were used to study the mechanical properties and failure laws of rock masses with parallel cracks. The experiment considers the influences of crack length (��º, crack angle (��1...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2022-03-01
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| Series: | Archives of Civil Engineering |
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| Online Access: | https://journals.pan.pl/Content/122726/PDF/art07_corr_int.pdf |
| _version_ | 1811314359210606592 |
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| author | Jie Yang Haijun Chen Xiong Liangxiao Zhongyuan Xu Tao Zhou Changheng Yang |
| author_facet | Jie Yang Haijun Chen Xiong Liangxiao Zhongyuan Xu Tao Zhou Changheng Yang |
| author_sort | Jie Yang |
| collection | DOAJ |
| description | In this study, the uniaxial compression test and the numerical simulation of the twodimensional particle flow code (PFC2D) were used to study the mechanical properties and failure laws of rock masses with parallel cracks. The experiment considers the influences of crack length (��º, crack angle (��1, ��2), and numerical changes in the rock bridge length (ℎ) and bridge angle (��) on failures of rock-like specimens. The results indicate that the uniaxial compressive strength (UCS) of the rock-like specimens with parallel cracks decreases with increasing �� under different �� values. The smaller angle between the preset crack and the loadinging direction (��) resulting in higher UCS. In addition, a larger ℎ results in higher UCS in the specimen. When ��1 or ��2 is fixed, the UCS and elastic modulus of the specimen show an ‘M’ shape with an increase in ��. Moreover, the crack growth or failure mode of samples with different �� values is similar. When ��1 or ��2 is small, the failure of the specimen is affected by the development and expansion of wing cracks. If one of ��1 and ��2 is large, the failure of the specimen is dominated by the expansion and development of the secondary cracks which is generated at the tip of the prefabricated crack. Furthermore, when the angle between the prefabricated crack and the loading direction is ��1 = 0°, the rock bridge is less likely to reach penetration failure as ℎ increases. Secondary crack connections between the prefabricated cracks occur only when �� is small. When �� ¡ 30°, the failure mode of the specimen is crack tip cracking which leads to penetration failure of the specimen, or the overall splitting failure. |
| first_indexed | 2024-04-13T11:11:26Z |
| format | Article |
| id | doaj.art-c73fc298a4ce41b19f7b422f33ac1ffc |
| institution | Directory Open Access Journal |
| issn | 2300-3103 |
| language | English |
| last_indexed | 2024-04-13T11:11:26Z |
| publishDate | 2022-03-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Civil Engineering |
| spelling | doaj.art-c73fc298a4ce41b19f7b422f33ac1ffc2022-12-22T02:49:07ZengPolish Academy of SciencesArchives of Civil Engineering2300-31032022-03-01vol. 68No 1111128https://doi.org/10.24425/ace.2022.140159Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulationJie Yang0https://orcid.org/0000-0001-8430-480XHaijun Chen1https://orcid.org/0000-0003-0094-9649Xiong Liangxiao2https://orcid.org/0000-0002-6366-5187Zhongyuan Xu3Tao Zhou4https://orcid.org/0000-0003-4303-1870Changheng Yang5https://orcid.org/0000-0001-8811-4632College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, PR ChinaGeotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu Province, 210029, PR ChinaSchool of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, PR ChinaDepartment of Earth Sciences, University of Delaware, Delaware 19716, United StatesCollege of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, PR ChinaSchool of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, PR ChinaIn this study, the uniaxial compression test and the numerical simulation of the twodimensional particle flow code (PFC2D) were used to study the mechanical properties and failure laws of rock masses with parallel cracks. The experiment considers the influences of crack length (��º, crack angle (��1, ��2), and numerical changes in the rock bridge length (ℎ) and bridge angle (��) on failures of rock-like specimens. The results indicate that the uniaxial compressive strength (UCS) of the rock-like specimens with parallel cracks decreases with increasing �� under different �� values. The smaller angle between the preset crack and the loadinging direction (��) resulting in higher UCS. In addition, a larger ℎ results in higher UCS in the specimen. When ��1 or ��2 is fixed, the UCS and elastic modulus of the specimen show an ‘M’ shape with an increase in ��. Moreover, the crack growth or failure mode of samples with different �� values is similar. When ��1 or ��2 is small, the failure of the specimen is affected by the development and expansion of wing cracks. If one of ��1 and ��2 is large, the failure of the specimen is dominated by the expansion and development of the secondary cracks which is generated at the tip of the prefabricated crack. Furthermore, when the angle between the prefabricated crack and the loading direction is ��1 = 0°, the rock bridge is less likely to reach penetration failure as ℎ increases. Secondary crack connections between the prefabricated cracks occur only when �� is small. When �� ¡ 30°, the failure mode of the specimen is crack tip cracking which leads to penetration failure of the specimen, or the overall splitting failure.https://journals.pan.pl/Content/122726/PDF/art07_corr_int.pdfuniaxial compressionparallel cracksnumerical simulationmechanical propertiesfailure characteristics |
| spellingShingle | Jie Yang Haijun Chen Xiong Liangxiao Zhongyuan Xu Tao Zhou Changheng Yang Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation Archives of Civil Engineering uniaxial compression parallel cracks numerical simulation mechanical properties failure characteristics |
| title | Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation |
| title_full | Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation |
| title_fullStr | Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation |
| title_full_unstemmed | Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation |
| title_short | Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation |
| title_sort | analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and pfc2d numerical simulation |
| topic | uniaxial compression parallel cracks numerical simulation mechanical properties failure characteristics |
| url | https://journals.pan.pl/Content/122726/PDF/art07_corr_int.pdf |
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