Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock
There are a large number of structural planes distributed in the surrounding rock of a tunnel, and this is one of the key factors causing a tunnel’s instability. Due to different geological and historical conditions, the distribution characteristics and the occurrence of structural planes in the roc...
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MDPI AG
2023-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/3/1946 |
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| author | Zhijie Sun Pengfei Li Xiuli Du Xuanyu Yang |
| author_facet | Zhijie Sun Pengfei Li Xiuli Du Xuanyu Yang |
| author_sort | Zhijie Sun |
| collection | DOAJ |
| description | There are a large number of structural planes distributed in the surrounding rock of a tunnel, and this is one of the key factors causing a tunnel’s instability. Due to different geological and historical conditions, the distribution characteristics and the occurrence of structural planes in the rock mass also have significant differences. In engineering, it is common to encounter structural planes that cut across the tunnel section and have a significant impact on the stability. The occurrence of structural planes is a key factor controlling the mechanical behavior of the surrounding rock. Based on this, laboratory uniaxial compression tests were carried out by constructing a small tunnel physical model with single structural planes of different inclination angles. A related numerical simulation analysis was also carried out. This research indicates that: (1) Under the influence of a single structural plane, the dip direction with 30°–60° is the most dangerous situation, and when the dip angle of the structural plane is between 38 and 88°, it will slip along the structural plane. (2) According to the mechanical mechanism, there are three types of cracks: tensile cracks, shear cracks, and tensile shear cracks. According to the deformation characteristics, there are four types: tension, friction, bending, and shear. (3) There is a certain correlation between the strength of a single discontinuity rock mass and that of a multi-jointed rock mass. When the dip angle of the joints’ combination is 45°+60°, the rock mass is in its weakest state. |
| first_indexed | 2024-03-11T09:50:54Z |
| format | Article |
| id | doaj.art-41101761b35e43a1adb94c473985c22b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T09:50:54Z |
| publishDate | 2023-02-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-41101761b35e43a1adb94c473985c22b2023-11-16T16:12:38ZengMDPI AGApplied Sciences2076-34172023-02-01133194610.3390/app13031946Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding RockZhijie Sun0Pengfei Li1Xiuli Du2Xuanyu Yang3The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, ChinaShanxi Intelligence Transportation Institute Co., Ltd., Taiyuan 030032, ChinaThere are a large number of structural planes distributed in the surrounding rock of a tunnel, and this is one of the key factors causing a tunnel’s instability. Due to different geological and historical conditions, the distribution characteristics and the occurrence of structural planes in the rock mass also have significant differences. In engineering, it is common to encounter structural planes that cut across the tunnel section and have a significant impact on the stability. The occurrence of structural planes is a key factor controlling the mechanical behavior of the surrounding rock. Based on this, laboratory uniaxial compression tests were carried out by constructing a small tunnel physical model with single structural planes of different inclination angles. A related numerical simulation analysis was also carried out. This research indicates that: (1) Under the influence of a single structural plane, the dip direction with 30°–60° is the most dangerous situation, and when the dip angle of the structural plane is between 38 and 88°, it will slip along the structural plane. (2) According to the mechanical mechanism, there are three types of cracks: tensile cracks, shear cracks, and tensile shear cracks. According to the deformation characteristics, there are four types: tension, friction, bending, and shear. (3) There is a certain correlation between the strength of a single discontinuity rock mass and that of a multi-jointed rock mass. When the dip angle of the joints’ combination is 45°+60°, the rock mass is in its weakest state.https://www.mdpi.com/2076-3417/13/3/1946tunnelstructural planesanisotropyuniaxial compression strength |
| spellingShingle | Zhijie Sun Pengfei Li Xiuli Du Xuanyu Yang Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock Applied Sciences tunnel structural planes anisotropy uniaxial compression strength |
| title | Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock |
| title_full | Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock |
| title_fullStr | Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock |
| title_full_unstemmed | Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock |
| title_short | Experimental Study on the Effect of Single Structural Plane on the Stability of Shallow Tunnel Surrounding Rock |
| title_sort | experimental study on the effect of single structural plane on the stability of shallow tunnel surrounding rock |
| topic | tunnel structural planes anisotropy uniaxial compression strength |
| url | https://www.mdpi.com/2076-3417/13/3/1946 |
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