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Experimental study on cyclic shear behavior of biopolymer-treated soil as a tunnel backfill materialoa mark
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Publication Year
2023-01-01
Journal
Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World- Proceedings of the ITA-AITES World Tunnel Congress, WTC 2023
Publisher
CRC Press/Balkema
Citation
Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World- Proceedings of the ITA-AITES World Tunnel Congress, WTC 2023, pp.168-173
Mesh Keyword
Backfill materialCyclic shearGround structureGrout injectionGrouting materialsPrimary materialsShear behaviourTreated soilsTunnel operationTunnel wall
All Science Classification Codes (ASJC)
Geotechnical Engineering and Engineering GeologyCivil and Structural EngineeringBuilding and Construction
Abstract
The purpose of backfill grout injection is to immediately fill voids left by the TBM body between the tunnel wall and the segmented blocks, preventing subsidence in the surrounding ground structure. The backfill material must resist various shear behaviors during tunnel operation. When cement is used as the primary material for grout, two significant problems can occur. First, the cement-based material has a small damping ratio. Therefore, stability against dynamic loading is low. Second, cement causes serious environmental problems because it causes alkalization due to its direct contact with the ground. Biopolymer-soil treatment improves strength and stiffness and has injection capabilities and permeability reduction effects, showing potential as a tunnel grouting material. However, the performance related to dynamic load has not been evaluated much. Therefore, applying biopolymer-based backfill grouting material will be evaluated through cyclic direct simple shear test by acquiring various types of geotechnical properties of the biopolymer-treated soil.
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/36995
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85160305408&origin=inward
DOI
https://doi.org/10.1201/9781003348030-21
Type
Conference
Funding
This research was financially supported by the Ministry of Oceans and Fisheries (MOF) of the Korea government (project no. 20220364).
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Chang, Il Han Image
Chang, Il Han장일한
Department of Civil Systems Engineering
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