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By R Dungar; G N Pande; J A Studer

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Extra resources for Numerical models in geomechanics

Sample text

It can be concluded that the total volume fraction that should be subtracted from the initial case (saturated) during the suction increase from the initial to final case is calculated by: (5) Page 34 where Vψ is the total influenced volume fraction, v(r, ψo ) is the initial volume fraction of pore class with radius r at suction ψ0, and v(r, ψf) is the final volume fraction at suction ψf of the final case.  A possible expression for can be constructed by considering that: – for R(ψ)

In order to validate this model, it is used to simulate the PSD modification for the experiments by Cuisinier & Laloui (2004) mentioned in section 1 of this paper.  The model predictions made for the PSD curves at suction levels of 50,100 and 200 kPa will be analysed.  This aspect was also observed for the experimental points.  Almost all macropores are affected by the suction increase.  This is also the case for Zone 2 (micropores), where the significant increase in micropores is well predicted.

Here, the results generated through the homogenization approach are again used as the benchmark against which the continuum approach is calibrated and verified.  For a periodic layered structure such criterion needs to be augmented to reflect the anisotropy associated with the actual geometry of the microstructure. e.  Note that the parameter c is identified here with the undrained shear strength and its variation incorporates a power­law in which c0 and ς are material constants.  Stress field in the unit cell.

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