Relating volume loss and greenfield settlement
Article
Article Title | Relating volume loss and greenfield settlement |
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ERA Journal ID | 4304 |
Article Category | Article |
Authors | Shiau, Jim (Author) and Sams, Mathew (Author) |
Journal Title | Tunnelling and Underground Space Technology |
Journal Citation | 83, pp. 145-152 |
Number of Pages | 8 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0886-7798 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.tust.2018.09.041 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0886779818302578 |
Abstract | This paper develops a numerical procedure for investigating settlement induced by circular tunnels in soft soils. The numerical procedure aims to simulate the movement and relaxation of the soil around the shield and lining annulus that occurs due to the overcutting and grouting of the tunnel void by a tunnel boring machine. A stress relaxation technique that progressively reduces the tunnel support pressure from a specific amount until a point of failure is detected. For three separate stages before this point of failure, the surface settlement data is exported for analysis. Using a regression of the commonly used Gaussian equation on the settlement data, ix values can be determined for each case. This is done for a number of geometry and soil stiffness and strength ratios which will cover the most practical range for soft cohesive soils. The results of this study are quite positive, settlement results compare well with previous experimental and observational results. Design charts using dimensionless ratios have therefore been presented. |
Keywords | tunnel; greenfield settlement; undrained; cohesive soil; volume loss |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4y2v/relating-volume-loss-and-greenfield-settlement
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