| Autor: |
Laredj, Nadia, Missoum, Hanifi, Bendani, Karim, Maliki, Mustapha |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Acta geotechnica Slovenica, vol. 8, no. 1, pp. 29-37, 2011. |
| ISSN: |
1854-0171 |
| Popis: |
The focus of this work is to provide a numerical formulation for coupled thermo-hydro-mechanical processes in unsaturated expansive clays, especially in compacted bentonite, with a multiphase fluid flow. The model is characterized by the presence of a deformable solid matrix filled with two fluid phases (liquid water and air). In the proposed model, both pore-water and air transfers are assumed to be governed by the generalized Darcy’s law. Fully coupled, nonlinear partial differential equations are established and then solved by using a Galerkin weighted residual approach in the space domain and an implicit integrating scheme in the time domain. The model has been validated against an experimental test from the literature, which involves bentonite under laboratory conditions. The calculated relative errors between the experimental and numerical results are 3% for the temperature and 7% for the stresses. Consequently, the developed numerical model predicts satisfactory results, when compared to the experimental test measures. The model is applicable to two-dimensional problems with various initial and boundary conditions non linear soil parameters can be easily included in this model. Članek prikazuje numerično formulacijo združenega termo-hidro-mehanskega procesa v nenasičeni nabrekljivi glini, posebej v kompaktnem bentonitu z dodajanjem tekočine v več fazah. Za model je značilna prisotnost deformabilne trdne snovi, napolnjene s tekočo vodo in zrakom. Predpostavlja se, da na pretoka porne vode in zraka vpliva posplošen Darcyjev zakon. Vpeljane nelinearne parcialne diferencialne enačbe so popolnoma vezane in jih rešimo z uporabo Galerkinovega pristopa - utežnih ostankov v prostorski domeni in implicitno integracijsko shemo v časovni domeni. Model smo primerjali z eksperimentalnim preizkusom iz literature, ki vključuje preizkus bentonita v laboratorijskih pogojih. Izračunane relativne napake med eksperimentalnimi in numeričnimi rezultati so 3% za temperaturo in 7% za napetosti. Podan numerični model napoveduje zadovoljive rezultate glede na rezultate eksperimentalnih meritev. Model lahko uporabimo pri dvodimenzionalnih problemih z različnimi začetnimi in robnimi pogoji, v ta model zlahka vključimo nelinearne parametre zemljine. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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