PSI - Issue 2_B

Andrey V. Dimaki et al. / Procedia Structural Integrity 2 (2016) 2606–2613 A.V. Dimaki et al / Structural Integrity Procedia 00 (2016) 000 – 000

2613

8







         exp с N 0 1

1 / c d V V / x x ch

,

2



(16)





0

p



2 / c d V V / x x ch

1



0

where the value ( )    corresponds to the strength of impermeable water-filled sample (in so called “ undrained ( )    represents the strength of a “dry” sample. Parameters 1 c and 2 c characterize the rate of change of exponential and sigmoidal branches of the dependence (16) with a change of permeability. Note that values 0  , 1  and 2  are not constant but depend on a thickness of elastic-plastic interface, physical mechanical parameters of a material and boundary conditions. The first term of the dependence (16) describes the exponential decrease of strength of a sample due to the decrease of effective stiffness of the elastic blocks under outflow of a liquid into an excess pore volume of a sample. Note that the latter leads to the decrease of the degree of constraint. The second term characterizes the influence of filtration on an increase of effective stiffness of the interface due to the growth of pore pressure of a liquid. This, in turn, leads to the increase of the degree of constraint of the interface. The parameters of the given dependence represent the combinations of the values of loading, width of the interface, physical-mechanical properties of the sample, including permeability, and physical mechanical properties of a liquid. conditions ”) and the value 0 2 0 1

Acknowledgements

The authors thank the Russian Science Foundation (Project 14-19-00718) for financial support.

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