Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Laboratory Experiments on Rheological Properties of Foam-Conditioned Weathered Granite Soil
https://orcid.org/http://orcid.org/0000-0002-7986-8915
https://orcid.org/http://orcid.org/0000-0002-3355-0653
https://orcid.org/https://orcid.org/0009-0005-4334-8853
https://orcid.org/http://orcid.org/0009-0003-6956-3389
https://orcid.org/http://orcid.org/0000-0002-2040-8850
Excavation of the Earth pressure balanced (EPB) shield tunnel boring machine (TBM) relies on the viscoplastic nature of excavated soil to maintain face pressure. Soil conditioning is a method that injects additives, such as foam and polymer, to make the excavated soil viscoplastic. Soil conditioning enhances the properties of excavated soil, reduces TBM torque and cutter wear, and improves excavation efficiency. Therefore, it is essential to evaluate the rheological properties of conditioned soil during the excavation of the EPB shield TBM. This study conducted slump tests and laboratory pressurized vane shear tests to evaluate the rheological properties of conditioned weathered granite soil. The prepared soil specimen was conditioned with foam as an additive. The foam was uniformly applied to the soil through the foam generator to meet the target foam expansion ratio (FER). The tests were conducted by changing the water contents and foam injection ratios (FIRs). The slump value of the conditioned weathered granite soil increased as the water content and FIR increased. However, the vane torque, peak strength, and yield stress decreased as the water content and FIR increased. Furthermore, the study confirmed a correlation between the slump value and yield stress.
Laboratory Experiments on Rheological Properties of Foam-Conditioned Weathered Granite Soil
https://orcid.org/http://orcid.org/0000-0002-7986-8915
https://orcid.org/http://orcid.org/0000-0002-3355-0653
https://orcid.org/https://orcid.org/0009-0005-4334-8853
https://orcid.org/http://orcid.org/0009-0003-6956-3389
https://orcid.org/http://orcid.org/0000-0002-2040-8850
Excavation of the Earth pressure balanced (EPB) shield tunnel boring machine (TBM) relies on the viscoplastic nature of excavated soil to maintain face pressure. Soil conditioning is a method that injects additives, such as foam and polymer, to make the excavated soil viscoplastic. Soil conditioning enhances the properties of excavated soil, reduces TBM torque and cutter wear, and improves excavation efficiency. Therefore, it is essential to evaluate the rheological properties of conditioned soil during the excavation of the EPB shield TBM. This study conducted slump tests and laboratory pressurized vane shear tests to evaluate the rheological properties of conditioned weathered granite soil. The prepared soil specimen was conditioned with foam as an additive. The foam was uniformly applied to the soil through the foam generator to meet the target foam expansion ratio (FER). The tests were conducted by changing the water contents and foam injection ratios (FIRs). The slump value of the conditioned weathered granite soil increased as the water content and FIR increased. However, the vane torque, peak strength, and yield stress decreased as the water content and FIR increased. Furthermore, the study confirmed a correlation between the slump value and yield stress.
Laboratory Experiments on Rheological Properties of Foam-Conditioned Weathered Granite Soil
https://orcid.org/http://orcid.org/0000-0002-7986-8915
https://orcid.org/http://orcid.org/0000-0002-3355-0653
https://orcid.org/https://orcid.org/0009-0005-4334-8853
https://orcid.org/http://orcid.org/0009-0003-6956-3389
https://orcid.org/http://orcid.org/0000-0002-2040-8850
Excavation of the Earth pressure balanced (EPB) shield tunnel boring machine (TBM) relies on the viscoplastic nature of excavated soil to maintain face pressure. Soil conditioning is a method that injects additives, such as foam and polymer, to make the excavated soil viscoplastic. Soil conditioning enhances the properties of excavated soil, reduces TBM torque and cutter wear, and improves excavation efficiency. Therefore, it is essential to evaluate the rheological properties of conditioned soil during the excavation of the EPB shield TBM. This study conducted slump tests and laboratory pressurized vane shear tests to evaluate the rheological properties of conditioned weathered granite soil. The prepared soil specimen was conditioned with foam as an additive. The foam was uniformly applied to the soil through the foam generator to meet the target foam expansion ratio (FER). The tests were conducted by changing the water contents and foam injection ratios (FIRs). The slump value of the conditioned weathered granite soil increased as the water content and FIR increased. However, the vane torque, peak strength, and yield stress decreased as the water content and FIR increased. Furthermore, the study confirmed a correlation between the slump value and yield stress.
Laboratory Experiments on Rheological Properties of Foam-Conditioned Weathered Granite Soil
Lecture Notes in Civil Engineering
Wu, Wei (Herausgeber:in) / Leung, Chun Fai (Herausgeber:in) / Zhou, Yingxin (Herausgeber:in) / Li, Xiaozhao (Herausgeber:in) / Hwang, Byeonghyun (Autor:in) / Bae, Abraham (Autor:in) / Lim, Kyuhyeong (Autor:in) / Kim, Hyunrae (Autor:in) / Choi, Hangseok (Autor:in)
Conference of the Associated research Centers for the Urban Underground Space ; 2023 ; Boulevard, Singapore
10.07.2024
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Soil Conditioning of Weathered Granite Soil used for EPB Shield TBM: A Laboratory Scale Study
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