Experimental study on acoustic emission characteristics of jointed rock mass by double disc cutter
The characteristics of joints are crucial factors which influence the penetration efficiency of tunnel boring machine (TBM). Based on the theoretical study, numerical simulation and experimental research, many researchers have studied the interaction between TBM disc cutters and jointed rock mass. H...
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| Published in | Journal of Central South University Vol. 25; no. 2; pp. 357 - 367 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Changsha
Central South University
01.02.2018
Springer Nature B.V |
| Subjects | |
| Online Access | Get full text |
| ISSN | 2095-2899 2227-5223 |
| DOI | 10.1007/s11771-018-3742-7 |
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| Abstract | The characteristics of joints are crucial factors which influence the penetration efficiency of tunnel boring machine (TBM). Based on the theoretical study, numerical simulation and experimental research, many researchers have studied the interaction between TBM disc cutters and jointed rock mass. However, in most of these works, the effect of joint on rock fragmentation by double disc cutter has been scarcely investigated. Thus, the effects of joint orientation and joint space on rock fragmentation by double disc cutter are highlighted in this study. During the test, jointed concrete specimens are adopted to simulate jointed rock mass. Improved RYL-600 rock shear rheological instrument was employed during the indentation process under disc cutters, and acoustic emission location system was used to analyze the rock damage and physical deterioration. The results show that there are four failure modes and three modes of crack initiation and propagation in jointed rock mass. It is concluded that the existing joint planes have obviously restrained the crack initiation and propagation during the rock fragmentation process. The results also indicate that samples are damaged most seriously when joint orientation equals 60°, which is proved to be the optimum joint orientation in TBM penetration. |
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| AbstractList | The characteristics of joints are crucial factors which influence the penetration efficiency of tunnel boring machine (TBM). Based on the theoretical study, numerical simulation and experimental research, many researchers have studied the interaction between TBM disc cutters and jointed rock mass. However, in most of these works, the effect of joint on rock fragmentation by double disc cutter has been scarcely investigated. Thus, the effects of joint orientation and joint space on rock fragmentation by double disc cutter are highlighted in this study. During the test, jointed concrete specimens are adopted to simulate jointed rock mass. Improved RYL-600 rock shear rheological instrument was employed during the indentation process under disc cutters, and acoustic emission location system was used to analyze the rock damage and physical deterioration. The results show that there are four failure modes and three modes of crack initiation and propagation in jointed rock mass. It is concluded that the existing joint planes have obviously restrained the crack initiation and propagation during the rock fragmentation process. The results also indicate that samples are damaged most seriously when joint orientation equals 60°, which is proved to be the optimum joint orientation in TBM penetration. |
| Author | Lin, Qi-bin Cao, Ping Zhou, Ke-ping Cao, Ri-hong Deng, Hong-wei Li, Kai-hui |
| Author_xml | – sequence: 1 givenname: Qi-bin surname: Lin fullname: Lin, Qi-bin organization: School of Resources and Safety Engineering, Central South University – sequence: 2 givenname: Ping surname: Cao fullname: Cao, Ping organization: School of Resources and Safety Engineering, Central South University – sequence: 3 givenname: Kai-hui surname: Li fullname: Li, Kai-hui organization: School of Resources and Safety Engineering, Central South University, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University – sequence: 4 givenname: Ri-hong orcidid: 0000-0002-6293-6248 surname: Cao fullname: Cao, Ri-hong email: 18229997417@163.com organization: School of Resources and Safety Engineering, Central South University, School of Civil, Environmental and Mining Engineering, The University of Western Australia – sequence: 5 givenname: Ke-ping surname: Zhou fullname: Zhou, Ke-ping organization: School of Resources and Safety Engineering, Central South University – sequence: 6 givenname: Hong-wei surname: Deng fullname: Deng, Hong-wei organization: School of Resources and Safety Engineering, Central South University |
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| Cites_doi | 10.1007/s11771-015-2903-1 10.1016/j.tust.2004.08.006 10.1016/j.ijrmms.2016.07.017 10.1016/j.mstc.2011.06.008 10.1007/s11771-015-2714-4 10.1016/j.tust.2015.12.008 10.1016/j.ijrmms.2004.04.006 10.1016/j.tust.2005.06.004 10.1016/j.wear.2017.09.020 |
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| Keywords | 裂纹扩展 jointed rock mass 隧道掘进机 crack propagation tunnel boring machine (TBM) rock fragmentation 破岩 声发射 acoustic emission 节理岩体 |
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| SubjectTerms | Acoustic emission Boring machines Computer simulation Crack initiation Crack propagation Disc cutters Drilling & boring machinery Emission analysis Engineering Failure modes Fragmentation Indentation Jointed rock Metallic Materials Orientation Penetration Rheological properties Studies |
| Title | Experimental study on acoustic emission characteristics of jointed rock mass by double disc cutter |
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