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[doc] Comparison of different Bishop's models.
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web/content/docs/benchmarks/richards-mechanics/BishopsEffectiveStress.png
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web/content/docs/benchmarks/richards-mechanics/bishops-effective-stress.pandoc
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project = "RichardsMechanics/bishops_effective_stress_power_law.prj" | ||
author = "Dmitri Naumov" | ||
date = "2020-02-27" | ||
title = "Bishop's effective stress models comparison" | ||
weight = 153 | ||
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[menu] | ||
[menu.benchmarks] | ||
parent = "richards-mechanics" | ||
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{{< data-link >}} | ||
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Two models for the Bishop's effective stress computation are presented; the | ||
power-law model, and saturation cut-off model. The models are: | ||
$$ | ||
\chi(S_\mathrm{L}) = S_\mathrm{L}^{m_\chi} | ||
\qquad \mbox{and}\qquad | ||
\chi(S_\mathrm{L}) = | ||
\chi = \begin{cases} | ||
1 & \mbox{for $S_\text{L} \geq S_\text{cutoff}$} | ||
\\ | ||
0 & \mbox{for $S_\text{L} < S_\text{cutoff}$.} | ||
\end{cases} | ||
$$ | ||
Simulation result shows different influence of the effective stress on the | ||
displacement. In the test the medium is desaturated and then saturated again, | ||
which causes shrinkage and expansion of the domain. Power law with exponents 1, | ||
1/5, and 5 and saturation cut-off at maximum liquid saturation of 0.95 are | ||
compared. | ||
{{< img src="../BishopsEffectiveStress.png" >}} |