Modelling free gas overpressure in peat layers

The paper assesses fully coupled hydro-mechanical numerical approaches developed for unsaturated soils to model the effect of free gas overpressure on the response of peat layers. A simple linear model is used for the soil skeleton, however, the global response is non-linear due to changes over time...

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Bibliographic Details
Published in:E3S web of conferences 2020-01, Vol.195, p.2027
Main Authors: Muraro, Stefano, Jommi, Cristina
Format: Article
Language:English
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Summary:The paper assesses fully coupled hydro-mechanical numerical approaches developed for unsaturated soils to model the effect of free gas overpressure on the response of peat layers. A simple linear model is used for the soil skeleton, however, the global response is non-linear due to changes over time of the compressibility of the solid skeleton over the compressibility of the fluid, and solubility of gas in water. The overpressure generated in foundation peat layers by barometric pressure oscillations is modelled, and the results are compared to literature data. The development of pore overpressure upon unloading is analysed as a function of the soil skeleton compressibility, and the consequences on the average stress acting on the soil skeleton are discussed.
ISSN:2267-1242
2267-1242
DOI:10.1051/e3sconf/202019502027