Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.

Shield tunneling in karst areas poses significant challenges, as vibration caused by the shield machine can disturb the stability of the karst caves, ultimately resulting in the collapse of a tunnel. In the present study, a numerical model involving an iteration process was developed based on the Mi...

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Autores principales:	Zhen Liu, Weihua Ming, Jieming Li, Cuiying Zhou, Lihai Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/08a7b6ad85b24dab95ecba0956b79494
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spelling	oai:doaj.org-article:08a7b6ad85b24dab95ecba0956b794942021-12-02T20:07:16ZNumerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.1932-620310.1371/journal.pone.0252733https://doaj.org/article/08a7b6ad85b24dab95ecba0956b794942021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0252733https://doaj.org/toc/1932-6203Shield tunneling in karst areas poses significant challenges, as vibration caused by the shield machine can disturb the stability of the karst caves, ultimately resulting in the collapse of a tunnel. In the present study, a numerical model involving an iteration process was developed based on the Mindlin solution scheme to identify the optimal shield tunneling speed for minimizing the disturbance to karst cave stability. The developed model was then implemented to investigate an underground tunnel constructed in a karst region with different shield tunneling strategies. By using the variation in the energy density of a karst cave as a performance index, the model predicts that when approaching the affected zone of a karst carve (e.g., approximately 5 m from the carve), the shield tunneling machine should be controlled within a certain speed (i.e., < 30 mm/min). Once the shield tunneling machine moves into the affected zone of the cave, the speed of the machine needs to be decelerated to 11 mm/min, and the speed of 30 mm/min can be restored when the shield machine moves out of the affected zone. This finding demonstrates that the developed model could potentially be used to identify the optimal shield tunneling speed to minimize the disturbance to karst cave stability and ensure the safety of tunnel construction in karst regions.Zhen LiuWeihua MingJieming LiCuiying ZhouLihai ZhangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0252733 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhen Liu Weihua Ming Jieming Li Cuiying Zhou Lihai Zhang Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
description	Shield tunneling in karst areas poses significant challenges, as vibration caused by the shield machine can disturb the stability of the karst caves, ultimately resulting in the collapse of a tunnel. In the present study, a numerical model involving an iteration process was developed based on the Mindlin solution scheme to identify the optimal shield tunneling speed for minimizing the disturbance to karst cave stability. The developed model was then implemented to investigate an underground tunnel constructed in a karst region with different shield tunneling strategies. By using the variation in the energy density of a karst cave as a performance index, the model predicts that when approaching the affected zone of a karst carve (e.g., approximately 5 m from the carve), the shield tunneling machine should be controlled within a certain speed (i.e., < 30 mm/min). Once the shield tunneling machine moves into the affected zone of the cave, the speed of the machine needs to be decelerated to 11 mm/min, and the speed of 30 mm/min can be restored when the shield machine moves out of the affected zone. This finding demonstrates that the developed model could potentially be used to identify the optimal shield tunneling speed to minimize the disturbance to karst cave stability and ensure the safety of tunnel construction in karst regions.
format	article
author	Zhen Liu Weihua Ming Jieming Li Cuiying Zhou Lihai Zhang
author_facet	Zhen Liu Weihua Ming Jieming Li Cuiying Zhou Lihai Zhang
author_sort	Zhen Liu
title	Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
title_short	Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
title_full	Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
title_fullStr	Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
title_full_unstemmed	Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
title_sort	numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/08a7b6ad85b24dab95ecba0956b79494
work_keys_str_mv	AT zhenliu numericalpredictionoftheoptimalshieldtunnelingstrategyfortunnelconstructioninkarstregions AT weihuaming numericalpredictionoftheoptimalshieldtunnelingstrategyfortunnelconstructioninkarstregions AT jiemingli numericalpredictionoftheoptimalshieldtunnelingstrategyfortunnelconstructioninkarstregions AT cuiyingzhou numericalpredictionoftheoptimalshieldtunnelingstrategyfortunnelconstructioninkarstregions AT lihaizhang numericalpredictionoftheoptimalshieldtunnelingstrategyfortunnelconstructioninkarstregions
_version_	1718375283049889792

Numerical prediction of the optimal shield tunneling strategy for tunnel construction in karst regions.

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