Numerical investigation of stability and settlement of tunnels in undrained clay
Masters Thesis
Title | Numerical investigation of stability and settlement of tunnels in undrained clay |
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Type | Masters Thesis |
Authors | |
Author | Sams, Mathew S. |
Supervisor | Shiau, Dr Jim |
Institution of Origin | University of Southern Queensland |
Qualification Name | Master of Engineering (Research) |
Number of Pages | 157 |
Year | 2016 |
Abstract | This thesis describes the development, verification and use of a numerical model for investigating circular tunnels in cohesive soils. Using this model, important problems relating to tunnel construction can be studied. In particular, it studies the stability and settlement problems that arise during the construction of single and The settlement data is analysed using a regression of the commonly used Gaussian equation on the settlement data. This approach allows a settlement parameter (ix) to be estimated reliably and accurately for each case. 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, which allow the prediction of a settlement profile based on geometry, Stability is analysed using the widely used Broms-Bennermark stability number (N). This approach allows an N to be calculated for each case, which defines the differential between surface and internal pressure. By determining the collapse stage during the relaxation method, an envelope for the critical N is developed. This |
Keywords | circular tunnels; cohesive soils; tunnel construction; soil settlement; soil stability; tunnel-boring machines |
ANZSRC Field of Research 2020 | 400504. Construction engineering |
370509. Sedimentology | |
Byline Affiliations | School of Civil Engineering and Surveying |
https://research.usq.edu.au/item/q3835/numerical-investigation-of-stability-and-settlement-of-tunnels-in-undrained-clay
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