Settlement Analysis of Mud-Water Shield Passing Full-Face Water-Rich Sand and Cobble Stratum Under Luo River

The shield construction of Line 2 of Luoyang Metro is designed to under-cross Luo River, the soils around the shield tunnels are composed of cobble, the permeability coefficient is about 140.0 m/d, the grain size of the cobble stratum is mainly from 2.0 to 10.0 cm, and the maximum grain size is up t...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2024-01, Vol.42 (1), p.535-542
Main Authors: Huang, Jianghua, Xu, Ping, Huang, Zhenlei
Format: Article
Language:English
Subjects:
Civil Engineering
Computer simulation
Construction
Earth and Environmental Science
Earth Sciences
Finite element method
Geotechnical Engineering & Applied Earth Sciences
Grain size
Grouting
Hydrogeology
Mathematical analysis
Mathematical models
Monitoring
Mud
Original Paper
Particle size
Permeability
Permeability coefficient
Research methods
Rivers
Settlement analysis
Soil improvement
Soil permeability
Strata
Terrestrial Pollution
Tunneling
Tunneling shields
Waste Management/Waste Technology
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Summary:The shield construction of Line 2 of Luoyang Metro is designed to under-cross Luo River, the soils around the shield tunnels are composed of cobble, the permeability coefficient is about 140.0 m/d, the grain size of the cobble stratum is mainly from 2.0 to 10.0 cm, and the maximum grain size is up to 40.0 cm. Numerical simulations of the settlement caused by the shield construction under Luo River are carried out with finite element software of ABAQUS, and the calculated maximum cumulative ground settlement and settlement rate do not reach the monitoring alarm value. In order to ensure the safe construction of shield, control measures such as mud improvement, soil bin pressure, synchronous grouting pressure and secondary grouting during the shield structure construction are proposed. The in-situ measured results of the settlements during the shield tunneling process show that the maximum accumulated settlement and settlement rate don’t reach the monitoring alarm value, and the left and right shields crossed Luo River safely, which is consistent with the numerical simulation results. The shield tunneling measures and research methods proposed in this paper can provide references for similar projects in future.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-023-02587-2