Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils
For in-service metro shield tunnels in soft soils, large circular deformations are a major concern because they usually lead to various problems, such as water leakage, joint openings, and concrete cracks. However, the monitoring of circular deformation depends mainly on manual surveying, and the au...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8886402 |
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| author | Jinfeng Zhang Ming Zhao |
| author_facet | Jinfeng Zhang Ming Zhao |
| author_sort | Jinfeng Zhang |
| collection | DOAJ |
| description | For in-service metro shield tunnels in soft soils, large circular deformations are a major concern because they usually lead to various problems, such as water leakage, joint openings, and concrete cracks. However, the monitoring of circular deformation depends mainly on manual surveying, and the automatic monitoring methods developed in recent years generally have low economic applicability and are not widely implemented. In this study, an automatic and cost-effective system was presented to monitor circular deformation in shield tunnels by using only inclinometers. Experiments were conducted to prove the assumption that each segment can be regarded as a rigid body and to investigate the position of the joint rotation center. Then, a method for monitoring circular deformation based on the rigid body and plane section assumptions was proposed. The joint opening angle, maximum joint opening width, horizontal diameter convergence, and bolt strain were calculated from rotation angles of segments which can be monitored directly by inclinometer. A case study was conducted for a section of a metro shield tunnel with an ongoing pit excavation nearby. The rotation of segments was measured using MEMS inclinometers, and the data were transmitted using ZigBee and general packet radio service (GPRS) wireless communication technology. Results show that the proposed system could be implemented to improve transportation safety in relevant situations and similar conditions. |
| format | Article |
| id | doaj-art-674c18ba7d744280ae99cb5a8f434105 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-674c18ba7d744280ae99cb5a8f4341052025-02-03T01:05:08ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88864028886402Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft SoilsJinfeng Zhang0Ming Zhao1Department of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, ChinaDepartment of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, ChinaFor in-service metro shield tunnels in soft soils, large circular deformations are a major concern because they usually lead to various problems, such as water leakage, joint openings, and concrete cracks. However, the monitoring of circular deformation depends mainly on manual surveying, and the automatic monitoring methods developed in recent years generally have low economic applicability and are not widely implemented. In this study, an automatic and cost-effective system was presented to monitor circular deformation in shield tunnels by using only inclinometers. Experiments were conducted to prove the assumption that each segment can be regarded as a rigid body and to investigate the position of the joint rotation center. Then, a method for monitoring circular deformation based on the rigid body and plane section assumptions was proposed. The joint opening angle, maximum joint opening width, horizontal diameter convergence, and bolt strain were calculated from rotation angles of segments which can be monitored directly by inclinometer. A case study was conducted for a section of a metro shield tunnel with an ongoing pit excavation nearby. The rotation of segments was measured using MEMS inclinometers, and the data were transmitted using ZigBee and general packet radio service (GPRS) wireless communication technology. Results show that the proposed system could be implemented to improve transportation safety in relevant situations and similar conditions.http://dx.doi.org/10.1155/2020/8886402 |
| spellingShingle | Jinfeng Zhang Ming Zhao Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils Advances in Civil Engineering |
| title | Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils |
| title_full | Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils |
| title_fullStr | Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils |
| title_full_unstemmed | Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils |
| title_short | Monitoring System for Circular Deformation in Metro Shield Tunnels in Soft Soils |
| title_sort | monitoring system for circular deformation in metro shield tunnels in soft soils |
| url | http://dx.doi.org/10.1155/2020/8886402 |
| work_keys_str_mv | AT jinfengzhang monitoringsystemforcirculardeformationinmetroshieldtunnelsinsoftsoils AT mingzhao monitoringsystemforcirculardeformationinmetroshieldtunnelsinsoftsoils |