The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics
The phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples t...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2018/3503940 |
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| author | Xiangxin Liu Sibo Zhan Yanbo Zhang Xiaolei Wang Zhengzhao Liang Baozhu Tian |
| author_facet | Xiangxin Liu Sibo Zhan Yanbo Zhang Xiaolei Wang Zhengzhao Liang Baozhu Tian |
| author_sort | Xiangxin Liu |
| collection | DOAJ |
| description | The phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples to monitor the tunnel forming process in situ, and the different horizontal stresses can be studied by using the AE monitoring technique. The dynamical fracturing process of the tunnel model was summarized, and the timing parameters of AE signals in rockburst stages were obtained. The curves of AE energy and cumulative AE energy with time show a “step-like” rising trend before the occurrence of rockburst. The evolution of macro- and mesocracks is captured, and the mechanical conditions for a “V-shaped” rockburst pit are derived. As the horizontal stress increases, the effect of excavation unloading becomes more pronounced, and the damage caused by the rockburst intensifies. In the early stage of rockburst evolution, the fracturing type follows a model of tensile-shear mix model. A positive relationship between the ratio of shear fracturing type and the horizontal stress can be noted when the rock is about to burst, and the high intensity and the high energy released of from the rock-fracturing event have become evident. Thus, the results indicate that one should focus on monitoring both sides of the surrounding rock of the tunnel so as to extract the characteristics of the process of tunnel in tunnel. The applications of biaxial loading system and during an excavation operation provide a useful tool to simulate the rock burst in tunnel at an engineering site. |
| format | Article |
| id | doaj-art-5a602d80274a404dbafd1204bda7a2a2 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-5a602d80274a404dbafd1204bda7a2a22025-02-03T01:26:12ZengWileyShock and Vibration1070-96221875-92032018-01-01201810.1155/2018/35039403503940The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission CharacteristicsXiangxin Liu0Sibo Zhan1Yanbo Zhang2Xiaolei Wang3Zhengzhao Liang4Baozhu Tian5School of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, ChinaSchool of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, ChinaSchool of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, ChinaSchool of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, ChinaState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, ChinaSchool of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, ChinaThe phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples to monitor the tunnel forming process in situ, and the different horizontal stresses can be studied by using the AE monitoring technique. The dynamical fracturing process of the tunnel model was summarized, and the timing parameters of AE signals in rockburst stages were obtained. The curves of AE energy and cumulative AE energy with time show a “step-like” rising trend before the occurrence of rockburst. The evolution of macro- and mesocracks is captured, and the mechanical conditions for a “V-shaped” rockburst pit are derived. As the horizontal stress increases, the effect of excavation unloading becomes more pronounced, and the damage caused by the rockburst intensifies. In the early stage of rockburst evolution, the fracturing type follows a model of tensile-shear mix model. A positive relationship between the ratio of shear fracturing type and the horizontal stress can be noted when the rock is about to burst, and the high intensity and the high energy released of from the rock-fracturing event have become evident. Thus, the results indicate that one should focus on monitoring both sides of the surrounding rock of the tunnel so as to extract the characteristics of the process of tunnel in tunnel. The applications of biaxial loading system and during an excavation operation provide a useful tool to simulate the rock burst in tunnel at an engineering site.http://dx.doi.org/10.1155/2018/3503940 |
| spellingShingle | Xiangxin Liu Sibo Zhan Yanbo Zhang Xiaolei Wang Zhengzhao Liang Baozhu Tian The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics Shock and Vibration |
| title | The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics |
| title_full | The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics |
| title_fullStr | The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics |
| title_full_unstemmed | The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics |
| title_short | The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics |
| title_sort | mechanical and fracturing of rockburst in tunnel and its acoustic emission characteristics |
| url | http://dx.doi.org/10.1155/2018/3503940 |
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