Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation
In this article, a magnetic sensor is proposed to monitor borehole deviation during tunnel excavation. It is made by piling four super-strong N42 NdFeB cylinder magnets and then encasing them in an aluminum alloy hollow cylinder. The distribution of the magnetic field produced by the magnetic sensor...
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MDPI AG
2018-08-01
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| Series: | Materials |
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| Online Access: | http://www.mdpi.com/1996-1944/11/9/1511 |
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| author | Fujian Tang Jianzhou Yang Hong-Nan Li Fuqiang Liu Ningbo Wang Peng Jia Yizheng Chen |
| author_facet | Fujian Tang Jianzhou Yang Hong-Nan Li Fuqiang Liu Ningbo Wang Peng Jia Yizheng Chen |
| author_sort | Fujian Tang |
| collection | DOAJ |
| description | In this article, a magnetic sensor is proposed to monitor borehole deviation during tunnel excavation. It is made by piling four super-strong N42 NdFeB cylinder magnets and then encasing them in an aluminum alloy hollow cylinder. The distribution of the magnetic field produced by the magnetic sensor and its summation with the geomagnetic field (GMF) in a global coordinate system are derived based on the theory of magnetic fields. An algorithm is developed to localize the position of the magnetic sensor. The effect of the GMF variation on the effective monitoring range of the magnetic sensor is also studied numerically. Field validation tests are conducted at Jinzhai Pumped-Storage hydroelectric power station, during the excavation of an inclined tunnel in Anhui Province of China. Test results show that the algorithm and the magnetic sensor are used successfully to detect the deviation of the borehole with an estimated error of approximately 0.5 m. The errors are mainly from the measurement errors of the coordinates, of both the test and the measurement points. The effective monitoring range of the magnetic sensor is dependent on the direction of the magnetic sensor as well as the variation of the GMF. |
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| format | Article |
| id | doaj.art-5fc1a9179c5c41b38a077a9287838b8a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-13T05:26:38Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-5fc1a9179c5c41b38a077a9287838b8a2022-12-22T03:00:34ZengMDPI AGMaterials1996-19442018-08-01119151110.3390/ma11091511ma11091511Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel ExcavationFujian Tang0Jianzhou Yang1Hong-Nan Li2Fuqiang Liu3Ningbo Wang4Peng Jia5Yizheng Chen6State Key Laboratory of Coastal and Offshore Engineering, School of Civil Engineering, Dalian University of Technology, Dalian 116024, ChinaHenan Tianchi Pumped Storage Energy Corporation, Nanyang 474664, ChinaState Key Laboratory of Coastal and Offshore Engineering, School of Civil Engineering, Dalian University of Technology, Dalian 116024, ChinaHenan Tianchi Pumped Storage Energy Corporation, Nanyang 474664, ChinaHenan Tianchi Pumped Storage Energy Corporation, Nanyang 474664, ChinaHenan Tianchi Pumped Storage Energy Corporation, Nanyang 474664, ChinaHolcombe Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USAIn this article, a magnetic sensor is proposed to monitor borehole deviation during tunnel excavation. It is made by piling four super-strong N42 NdFeB cylinder magnets and then encasing them in an aluminum alloy hollow cylinder. The distribution of the magnetic field produced by the magnetic sensor and its summation with the geomagnetic field (GMF) in a global coordinate system are derived based on the theory of magnetic fields. An algorithm is developed to localize the position of the magnetic sensor. The effect of the GMF variation on the effective monitoring range of the magnetic sensor is also studied numerically. Field validation tests are conducted at Jinzhai Pumped-Storage hydroelectric power station, during the excavation of an inclined tunnel in Anhui Province of China. Test results show that the algorithm and the magnetic sensor are used successfully to detect the deviation of the borehole with an estimated error of approximately 0.5 m. The errors are mainly from the measurement errors of the coordinates, of both the test and the measurement points. The effective monitoring range of the magnetic sensor is dependent on the direction of the magnetic sensor as well as the variation of the GMF.http://www.mdpi.com/1996-1944/11/9/1511magnetic sensorpumped-storage hydroelectricitytunnel excavationborehole deviation |
| spellingShingle | Fujian Tang Jianzhou Yang Hong-Nan Li Fuqiang Liu Ningbo Wang Peng Jia Yizheng Chen Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation Materials magnetic sensor pumped-storage hydroelectricity tunnel excavation borehole deviation |
| title | Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation |
| title_full | Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation |
| title_fullStr | Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation |
| title_full_unstemmed | Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation |
| title_short | Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation |
| title_sort | field validation of a magnetic sensor to monitor borehole deviation during tunnel excavation |
| topic | magnetic sensor pumped-storage hydroelectricity tunnel excavation borehole deviation |
| url | http://www.mdpi.com/1996-1944/11/9/1511 |
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