Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock
In engineering practice, the initial support system is commonly installed in the vicinity of the tunnel face after excavation, whereas the self-capacity of rock mass will fail to be utilized and the cost of the initial support system will be expensive. In this study, a methodology is proposed to det...
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doaj-eae56539771e495da9cf954b5efac6f22020-11-25T04:01:31ZengMDPI AGApplied Sciences2076-34172020-08-01105653565310.3390/app10165653Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding RockYan-Jun Zhang0Kai Su1Hong-Ze Zhu2Zhong-Dong Qian3He-Gao Wu4State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaIn engineering practice, the initial support system is commonly installed in the vicinity of the tunnel face after excavation, whereas the self-capacity of rock mass will fail to be utilized and the cost of the initial support system will be expensive. In this study, a methodology is proposed to determine the appropriate timing of initial support installation to find out the balance of tunnel safety and construction cost. Firstly, the global safety factor is introduced as the critical indicator to evaluate tunnel stability. Then, the comprehensive graphic relationship between the global safety factor and the distance to the tunnel face is established. Once the global safety factor decreases to an admissible value, the stability of the surrounding rock is in a critical state and the corresponding distance is the recommended location for installing the initial support. In these procedures, the installation time of the initial support at the typical tunnel section can be quickly designed and fed back by a direct indicator during construction. Meanwhile, several cases with different conditions have been carried out to discuss the regularity of the method.https://www.mdpi.com/2076-3417/10/16/5653tunnel excavationsafety factortunnel stabilityinitial ground support |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yan-Jun Zhang Kai Su Hong-Ze Zhu Zhong-Dong Qian He-Gao Wu |
spellingShingle |
Yan-Jun Zhang Kai Su Hong-Ze Zhu Zhong-Dong Qian He-Gao Wu Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock Applied Sciences tunnel excavation safety factor tunnel stability initial ground support |
author_facet |
Yan-Jun Zhang Kai Su Hong-Ze Zhu Zhong-Dong Qian He-Gao Wu |
author_sort |
Yan-Jun Zhang |
title |
Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock |
title_short |
Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock |
title_full |
Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock |
title_fullStr |
Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock |
title_full_unstemmed |
Installation Time of an Initial Support for Tunnel Excavation upon the Safety Factors of Surrounding Rock |
title_sort |
installation time of an initial support for tunnel excavation upon the safety factors of surrounding rock |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2020-08-01 |
description |
In engineering practice, the initial support system is commonly installed in the vicinity of the tunnel face after excavation, whereas the self-capacity of rock mass will fail to be utilized and the cost of the initial support system will be expensive. In this study, a methodology is proposed to determine the appropriate timing of initial support installation to find out the balance of tunnel safety and construction cost. Firstly, the global safety factor is introduced as the critical indicator to evaluate tunnel stability. Then, the comprehensive graphic relationship between the global safety factor and the distance to the tunnel face is established. Once the global safety factor decreases to an admissible value, the stability of the surrounding rock is in a critical state and the corresponding distance is the recommended location for installing the initial support. In these procedures, the installation time of the initial support at the typical tunnel section can be quickly designed and fed back by a direct indicator during construction. Meanwhile, several cases with different conditions have been carried out to discuss the regularity of the method. |
topic |
tunnel excavation safety factor tunnel stability initial ground support |
url |
https://www.mdpi.com/2076-3417/10/16/5653 |
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