CHEMENDA , A.

Experimental data show that inelastic straining occurs even at very low pressure before and during brittle fracturing. This process is therefore investigated within the framework of elastoplasticity using 2‐D, three‐layer finite difference modeling. The constitutive model includes both tensile and shear failure mechanisms coupled at the level...

It is known that there is stress concentration at specimen ends during experimental rock tests. This causes a deviation of the measured nominal (average) stresses and strains from the actual ones, but it is not completely clear how strong it could be. We investigate this issue by numerical modeling of the hydrostatic tests using a reasonably...

Earth and Planetary Science Letters, v. 271, n. 1-4, p. 226-232, 2008. http://dx.doi.org/10.1016/j.epsl.2008.04.011

The dilatancy is as important property of rock-type (granular, frictional, cohesive, and dilatant) materials as the internal friction, but it is generally ill-constrained and is rarely taken into account in applications, being set to zero. Theoretical analysis shows that the dilatancy factor β strongly affects the onset of the deformation...

In this chapter we present a review of 2D, and 3D, purely mechanical and thermo‐mechanical experimental models of arc-continent collision obtained using the modeling technique pioneered by A. Chemenda. Also presented are earlier models of oceanic and continental subduction which led to the development of the arc-continent collision experiments....

International audience

International audience

Using a new 3-D physical modelling technique we investigated the initiation and evolution of large scale landslides in presence of pre-existing large scale fractures and taking into account the slope material weakening due to the alteration/weathering. The modelling technique is based on the specially developed properly scaled analogue...

Journal of the Virtual Explorer, v. 7, p. 61-65, 2002

Tectonophysics, v. 356, n. 4, p. 253-273, 2002. http://dx.doi.org/10.1016/S0040-1951(02)00389-X

A new technique for physical (experimental) modeling of landsliding and the first results are presented. The technique is based on the use of new elasto-brittle-plastic analogue materials and an original vertical accelerator device enabling an increase in the ''gravity acceleration.'' This technique allows slope stability to be addressed in a...

Geophysical Research Letters, v. 33, n. 21, p. L21406, 2006. http://dx.doi.org/10.1029/2006GL028028

Geomorphology, v. 103, n. 1, p. 130135, 2009. http://dx.doi.org/10.1016/j.geomorph.2007.09.018

Earth and Planetary Science Letters, v. 222, n. 1, p. 209-216, 2004. http://dx.doi.org/10.1016/j.epsl.2004.02.013

Networks of localized conjugate compactive shear bands with large dihedral angles (corresponding to so-called shear-enhanced compaction bands) were generated in 3-layer plane strain finite-difference models. The central layer has elastic–plastic properties with a small positive internal friction coefficient, negative dilatancy factor, and the...

Earth and Planetary Science Letters, v. 212, n. 1-2, p. 31-45, 2003. http://dx.doi.org/10.1016/S0012-821X(03)00239-5

Both oedometric and plane-strain tests were performed with parallelepipedic samples made of synthetic granular, cohesive, frictional and dilatant rock analogue material GRAM2. For the first time parallel sets of fractures that have all the characteristics of natural joints were reproduced in the laboratory. The fractures are regularly spaced,...

An extensive program of axisymmetric compression and extension tests was performed with synthetic granular, cohesive, frictional and dilatant, low strength/rigidity rock analogue material. The program was motivated in particular by the lack of rock tests under extension, and was aimed at a detailed characterization of the constitutive...

The initiation and the initial evolution of a strike-slip fault are modeled within an elastoplasticity constitutive framework taking into account the evolution of the hardening modulus with inelastic straining. The initial and boundary conditions are similar to those of the Riedel shear experiment. The models first deform purely elastically....

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