Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning

Machine loads are always high, or soil conditioning is required to be rigorous when the pressure chamber is full of excavated soil during earth pressure balance (EPB) shield tunneling. This study investigates the feasibility and soil conditioning of the auxiliary air pressure balance mode for EPB sh...

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Autores principales:	Shuying Wang, Pengfei Liu, Zhenyu Gong, Peng Yang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Water-rich gravelly sand Earth pressure balance shield Auxiliary air pressure balance mode Soil conditioning Water pressure Ground settlement Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/6d42f307307843128145981e2109a311
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spelling	oai:doaj.org-article:6d42f307307843128145981e2109a3112021-11-30T04:16:01ZAuxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning2214-509510.1016/j.cscm.2021.e00799https://doaj.org/article/6d42f307307843128145981e2109a3112022-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2214509521003144https://doaj.org/toc/2214-5095Machine loads are always high, or soil conditioning is required to be rigorous when the pressure chamber is full of excavated soil during earth pressure balance (EPB) shield tunneling. This study investigates the feasibility and soil conditioning of the auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata to decrease the machine load based on a project in China. It is indicated that the suitable slump value for the mode to avoid muck spewing should be lower than that for the tunneling mode with the pressure chamber fully of excavated soil. The water pressure monitored in the ground around the tunnel experienced rising, falling and stable stages during the EPB shield tunneling of each lining ring. The peak value of water pressure occurred immediately after the EPB machine stopped and decreased quickly during the first 30 min thereafter, followed by a gradual decrease. The time required for the water pressure to again reach its initial value was 70–90 min and did not influence the tunneling behavior of the following lining ring. The monitored ground displacement was much lower than its allowable value. The monitoring results indicated the success of the application of the auxiliary air pressure balance mode with the discharged muck with a slump value of 2–10 cm in the strata, satisfying the controls of ground displacement and advancing speed. However, the higher soil workability induced a lower thrust force and cutterhead torque, more stable cutterhead torque and chamber pressure, and a higher shield advancing speed. Hence, the ideal slump value was determined to be 8–10 cm for the studied project constructed by the EPB shield with the auxiliary air pressure balance mode in the water-rich gravelly sand strata. Finally, future research is recommended for the application of the tunneling mode.Shuying WangPengfei LiuZhenyu GongPeng YangElsevierarticleWater-rich gravelly sandEarth pressure balance shieldAuxiliary air pressure balance modeSoil conditioningWater pressureGround settlementMaterials of engineering and construction. Mechanics of materialsTA401-492ENCase Studies in Construction Materials, Vol 16, Iss , Pp e00799- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water-rich gravelly sand Earth pressure balance shield Auxiliary air pressure balance mode Soil conditioning Water pressure Ground settlement Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Water-rich gravelly sand Earth pressure balance shield Auxiliary air pressure balance mode Soil conditioning Water pressure Ground settlement Materials of engineering and construction. Mechanics of materials TA401-492 Shuying Wang Pengfei Liu Zhenyu Gong Peng Yang Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
description	Machine loads are always high, or soil conditioning is required to be rigorous when the pressure chamber is full of excavated soil during earth pressure balance (EPB) shield tunneling. This study investigates the feasibility and soil conditioning of the auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata to decrease the machine load based on a project in China. It is indicated that the suitable slump value for the mode to avoid muck spewing should be lower than that for the tunneling mode with the pressure chamber fully of excavated soil. The water pressure monitored in the ground around the tunnel experienced rising, falling and stable stages during the EPB shield tunneling of each lining ring. The peak value of water pressure occurred immediately after the EPB machine stopped and decreased quickly during the first 30 min thereafter, followed by a gradual decrease. The time required for the water pressure to again reach its initial value was 70–90 min and did not influence the tunneling behavior of the following lining ring. The monitored ground displacement was much lower than its allowable value. The monitoring results indicated the success of the application of the auxiliary air pressure balance mode with the discharged muck with a slump value of 2–10 cm in the strata, satisfying the controls of ground displacement and advancing speed. However, the higher soil workability induced a lower thrust force and cutterhead torque, more stable cutterhead torque and chamber pressure, and a higher shield advancing speed. Hence, the ideal slump value was determined to be 8–10 cm for the studied project constructed by the EPB shield with the auxiliary air pressure balance mode in the water-rich gravelly sand strata. Finally, future research is recommended for the application of the tunneling mode.
format	article
author	Shuying Wang Pengfei Liu Zhenyu Gong Peng Yang
author_facet	Shuying Wang Pengfei Liu Zhenyu Gong Peng Yang
author_sort	Shuying Wang
title	Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
title_short	Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
title_full	Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
title_fullStr	Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
title_full_unstemmed	Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning
title_sort	auxiliary air pressure balance mode for epb shield tunneling in water-rich gravelly sand strata: feasibility and soil conditioning
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/6d42f307307843128145981e2109a311
work_keys_str_mv	AT shuyingwang auxiliaryairpressurebalancemodeforepbshieldtunnelinginwaterrichgravellysandstratafeasibilityandsoilconditioning AT pengfeiliu auxiliaryairpressurebalancemodeforepbshieldtunnelinginwaterrichgravellysandstratafeasibilityandsoilconditioning AT zhenyugong auxiliaryairpressurebalancemodeforepbshieldtunnelinginwaterrichgravellysandstratafeasibilityandsoilconditioning AT pengyang auxiliaryairpressurebalancemodeforepbshieldtunnelinginwaterrichgravellysandstratafeasibilityandsoilconditioning
_version_	1718406807804706816

Auxiliary air pressure balance mode for EPB shield tunneling in water-rich gravelly sand strata: Feasibility and soil conditioning

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