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Effect of Rock Abrasiveness on Wear of Shield Tunnelling in Bukit Timah Granite

Title
Effect of Rock Abrasiveness on Wear of Shield Tunnelling in Bukit Timah Granite
Author
이승원
Keywords
abrasiveness; CAI; wear; disc cutter; slurry pipe; wear coefficient; Bukit Timah granite
Issue Date
2020-05
Publisher
MDPI
Citation
APPLIED SCIENCES-BASEL, v. 10, no. 9, article no. 3231
Abstract
The abrasiveness of rocks significantly influences the wear endured by excavation tools in tunnel boring machines (TBMs). In slurry shield TBMs, wear occurs not only in excavation tools but also in discharge pipes and pumps of slurry transport systems. To explore this phenomenon, this study investigated the effect of rock abrasiveness on the wear of both disc cutters and slurry discharge pipes in slurry shield TBMs. The radial wear of disc cutters and the thickness of slurry discharge pipes were measured and monitored at a TBM site in Singapore. The relationship between the weathering grade of Bukit Timah granite and the wear coefficient of disc cutters was analysed, and a correlation between the Cerchar Abrasivity Index values and the wear coefficient of 19 inch disc cutters was suggested. Additionally, the average wear rates of slurry discharge pipes used for Bukit Timah granite were determined based on the pipe thickness measurements. The wear rates of weathering grades G(I) to G(IV) of Bukit Timah granite were observed to be highly similar to each other, whereas the wear rates of G(V) grade and mixed ground were 1.55 times higher than those of the G(I) to G(IV) grades. The correlation between the slurry discharge velocity and the wear rate in slurry discharge pipes was thus derived. The accurate assessment of the effect of rock abrasiveness on both the wear of disc cutters and the wear rate in slurry discharge pipes, investigated in this paper, will highlight the need for efficient maintenance of the excavation tools in TBMs and encourage the development of various equipment wear prevention measures in order to minimize overall construction costs and time.
URI
https://www.mdpi.com/2076-3417/10/9/3231https://repository.hanyang.ac.kr/handle/20.500.11754/166453
ISSN
2076-3417
DOI
10.3390/app10093231
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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