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http://dx.doi.org/10.9711/KTAJ.2022.24.5.355

A laboratory pressurized vane test for evaluating rheological properties of excavated soil for EPB shield TBM: test apparatus and applicability  

Kwak, Junho (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Hyobum (Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute)
Hwang, Byeonghyun (School of Civil, Environmental and Architectural Engineering, Korea University)
Choi, Junhyuk (School of Civil, Environmental and Architectural Engineering, Korea University)
Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.24, no.5, 2022 , pp. 355-374 More about this Journal
Abstract
Soil conditioning improves the performance of EPB (earth pressure balance) shield TBMs (tunnel boring machines) by reducing shear strength, enhancing workability of the excavated soil, and supporting the tunnel face during EPB tunnelling. The mechanical and rheological behavior of the excavated muck mixed with additives should be properly evaluated to determine the optimal additive injection condition corresponding to each ground type. In this study, the laboratory pressurized vane test apparatus equipped with a vane-shaped rheometer was developed to reproduce the pressurized condition in the TBM chamber and quantitively evaluate rheological properties of the soil specimens. A series of the pressurized vane tests were performed for an artificial sand soil by changing foam injection ratio (FIR) and polymer injection ratio (PIR), which are the injection parameters of the foam and the polymer, respectively. In addition, the workability of the conditioned soil was evaluated through the slump test. The peak and yield stresses of the conditioned soil with respect to the injection parameters were evaluated through the rheogram, which was derived from the measured torque data in the pressurized vane test. As FIR increased or PIR decreased, the workability of the conditioned soil increased, and the maximum torque, peak stress, and yield stress decreased. The peak stress and yield stress of the specimen from the laboratory pressurized vane test correspond to the workability evaluated by the slump tests, which implies the applicability of the proposed test for evaluating the rheological properties of excavated soil.
Keywords
EPB shield TBM; Laboratory pressurized vane test; Soil conditioning; Rheological property; Additive;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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