Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Laboratory Investigation on Excavation Performance of Foam-conditioned Weathered Granite Soil for EPB Shield Tunnelling
https://orcid.org/https://orcid.org/0000-0002-3862-7728
https://orcid.org/https://orcid.org/0009-0003-3889-197X
https://orcid.org/https://orcid.org/0000-0002-1749-1649
https://orcid.org/https://orcid.org/0000-0001-6735-4020
As weathered granite soils are extensively distributed in the Korean Peninsula, determining the optimal foam conditioning parameters for weathered granite soils can provide a high workability, low permeability, and high compressibility of weathered granite soils for successful operation of an earth pressure balance (EPB) shield tunnel boring machine (TBM). In this study, a laboratory-scale excavation apparatus was developed to conduct various laboratory excavation simulations for measuring the excavation-induced torque and the abrasivity of cutter bits. In addition, slump values, compressibility, and permeability were measured to evaluate the workability of foam-conditioned weathered granite soils. From the experimental results, the optimal foaming conditions for the weathered granite soil was obtained at foam injection ratios (F/Rs) of 60–70%, foam expansion ratios (FERs) of 15–18, and foaming agent concentrations (Cf) of 3–4%. The experimental results presented in this study can provide the rheological, mechanical, and hydraulic behavior of foam-conditioned weathered granite soils for successful EPB TBM operation.
Laboratory Investigation on Excavation Performance of Foam-conditioned Weathered Granite Soil for EPB Shield Tunnelling
https://orcid.org/https://orcid.org/0000-0002-3862-7728
https://orcid.org/https://orcid.org/0009-0003-3889-197X
https://orcid.org/https://orcid.org/0000-0002-1749-1649
https://orcid.org/https://orcid.org/0000-0001-6735-4020
As weathered granite soils are extensively distributed in the Korean Peninsula, determining the optimal foam conditioning parameters for weathered granite soils can provide a high workability, low permeability, and high compressibility of weathered granite soils for successful operation of an earth pressure balance (EPB) shield tunnel boring machine (TBM). In this study, a laboratory-scale excavation apparatus was developed to conduct various laboratory excavation simulations for measuring the excavation-induced torque and the abrasivity of cutter bits. In addition, slump values, compressibility, and permeability were measured to evaluate the workability of foam-conditioned weathered granite soils. From the experimental results, the optimal foaming conditions for the weathered granite soil was obtained at foam injection ratios (F/Rs) of 60–70%, foam expansion ratios (FERs) of 15–18, and foaming agent concentrations (Cf) of 3–4%. The experimental results presented in this study can provide the rheological, mechanical, and hydraulic behavior of foam-conditioned weathered granite soils for successful EPB TBM operation.
Laboratory Investigation on Excavation Performance of Foam-conditioned Weathered Granite Soil for EPB Shield Tunnelling
https://orcid.org/https://orcid.org/0000-0002-3862-7728
https://orcid.org/https://orcid.org/0009-0003-3889-197X
https://orcid.org/https://orcid.org/0000-0002-1749-1649
https://orcid.org/https://orcid.org/0000-0001-6735-4020
As weathered granite soils are extensively distributed in the Korean Peninsula, determining the optimal foam conditioning parameters for weathered granite soils can provide a high workability, low permeability, and high compressibility of weathered granite soils for successful operation of an earth pressure balance (EPB) shield tunnel boring machine (TBM). In this study, a laboratory-scale excavation apparatus was developed to conduct various laboratory excavation simulations for measuring the excavation-induced torque and the abrasivity of cutter bits. In addition, slump values, compressibility, and permeability were measured to evaluate the workability of foam-conditioned weathered granite soils. From the experimental results, the optimal foaming conditions for the weathered granite soil was obtained at foam injection ratios (F/Rs) of 60–70%, foam expansion ratios (FERs) of 15–18, and foaming agent concentrations (Cf) of 3–4%. The experimental results presented in this study can provide the rheological, mechanical, and hydraulic behavior of foam-conditioned weathered granite soils for successful EPB TBM operation.
Laboratory Investigation on Excavation Performance of Foam-conditioned Weathered Granite Soil for EPB Shield Tunnelling
KSCE J Civ Eng
Lee, Hyobum (Autor:in) / Oh, Jaehyun (Autor:in) / Shin, Young Jin (Autor:in) / Won, Jongmuk (Autor:in)
KSCE Journal of Civil Engineering ; 27 ; 5460-5469
01.12.2023
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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