Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study
To investigate the influencing factors of the shear failure behavior of rock joints, especially the shear instability characteristics, direct shear tests were performed on marble joints with various grain sizes under different constant normal loads (<i>CNLs</i>). The experimental results...
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2025-01-01
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| author | Hangyu Dong Baohua Guo Qing Ma Kai Si Hongjian Wang |
| author_facet | Hangyu Dong Baohua Guo Qing Ma Kai Si Hongjian Wang |
| author_sort | Hangyu Dong |
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| description | To investigate the influencing factors of the shear failure behavior of rock joints, especially the shear instability characteristics, direct shear tests were performed on marble joints with various grain sizes under different constant normal loads (<i>CNLs</i>). The experimental results show that the grain size and <i>CNL</i> have significant effects on the shear mechanical properties of rock joints. The peak shear strength (<i>τ<sub>p</sub></i>), peak shear displacement (<i>u<sub>p</sub></i>), post-peak modulus (<i>S</i>), and stress drop (Δ<i>τ</i>) of rock joints all increase first and then decrease with the increase in grain size, but they increase with the increase in CNL. The mineral composition and microstructure also have a certain influence on the shear mechanical properties of rock joints. In addition, the post-peak soften modulus (<i>S<sub>p</sub></i>) was proposed to describe the shear instability characteristics of rock joints, and its relationship with grain size and <i>CNL</i> was established. The mechanical model of the shear instability of rock joints was established, and the shear instability criterion of rock joints was proposed based on the stiffness criterion and the proposed post-peak soften modulus (<i>S<sub>p</sub></i>). This paper further reveals the shear instability mechanism of rock joints, which can provide a reference for the stability analysis of jointed rockmass. |
| format | Article |
| id | doaj-art-75f247be5db443a3ad4e3d297093c7cb |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-75f247be5db443a3ad4e3d297093c7cb2025-01-24T13:19:49ZengMDPI AGApplied Sciences2076-34172025-01-0115256110.3390/app15020561Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical StudyHangyu Dong0Baohua Guo1Qing Ma2Kai Si3Hongjian Wang4College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, ChinaJiangsu Xukuang Energy Co., Ltd., Xuzhou 221000, ChinaSchool of Civil Engineering, Zhengzhou University of Technology, Zhengzhou 450044, ChinaCollege of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaTo investigate the influencing factors of the shear failure behavior of rock joints, especially the shear instability characteristics, direct shear tests were performed on marble joints with various grain sizes under different constant normal loads (<i>CNLs</i>). The experimental results show that the grain size and <i>CNL</i> have significant effects on the shear mechanical properties of rock joints. The peak shear strength (<i>τ<sub>p</sub></i>), peak shear displacement (<i>u<sub>p</sub></i>), post-peak modulus (<i>S</i>), and stress drop (Δ<i>τ</i>) of rock joints all increase first and then decrease with the increase in grain size, but they increase with the increase in CNL. The mineral composition and microstructure also have a certain influence on the shear mechanical properties of rock joints. In addition, the post-peak soften modulus (<i>S<sub>p</sub></i>) was proposed to describe the shear instability characteristics of rock joints, and its relationship with grain size and <i>CNL</i> was established. The mechanical model of the shear instability of rock joints was established, and the shear instability criterion of rock joints was proposed based on the stiffness criterion and the proposed post-peak soften modulus (<i>S<sub>p</sub></i>). This paper further reveals the shear instability mechanism of rock joints, which can provide a reference for the stability analysis of jointed rockmass.https://www.mdpi.com/2076-3417/15/2/561rock jointshear instability<i>JRC</i>mineral compositionshear instability criterion |
| spellingShingle | Hangyu Dong Baohua Guo Qing Ma Kai Si Hongjian Wang Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study Applied Sciences rock joint shear instability <i>JRC</i> mineral composition shear instability criterion |
| title | Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study |
| title_full | Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study |
| title_fullStr | Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study |
| title_full_unstemmed | Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study |
| title_short | Influencing Factors of Shear Instability Characteristics of Rock Joints: Experimental and Theoretical Study |
| title_sort | influencing factors of shear instability characteristics of rock joints experimental and theoretical study |
| topic | rock joint shear instability <i>JRC</i> mineral composition shear instability criterion |
| url | https://www.mdpi.com/2076-3417/15/2/561 |
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