Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand

Details Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand

2010-11-23

arxiv.org/abs/1011.5130v1

Computer Physics Communications, Vol. 180, Issue 4, Pages 616-620 Published Apr 2009, ISSN 0010-4655

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 7 figures

Scientific paper

10.1016/j.cpc.2009.01.002

What is the relationship between the macroscopic parameters of the constitutive equation for a granular soil and the microscopic forces between grains? In order to investigate this connection, we have simulated by molecular dynamics the oedometric compression of a granular soil (a dry and bad-graded sand) and computed the hypoplastic parameters $h_s$ (the granular skeleton hardness) and $\eta$ (the exponent in the compression law) by following the same procedure than in experiments, that is by fitting the Bauer's law $e/e0 = exp(-(3p/hs)\eta)$, where $p$ is the pressure, and $e_0$ and $e$ are the initial and present void ratios. The micro-mechanical simulation includes elastic and dissipative normal forces plus slip, rolling and static friction between grains. By this way we have explored how the macroscopic parameters change by modifying the grains stiffness, V ; the dissipation coefficient, $\gamma_n$; the static friction coefficient, $\mu_s$; and the dynamic friction coefficient, $\mu_k$ . Cumulating all simulations, we obtained an unexpected result: the two macroscopic parameters seems to be related by a power law, $h_s = 0.068(4)\eta^{9.88(3)}$. Moreover, the experimental result for a Guamo sand with the same granulometry fits perfectly into this power law. Is this relation real? What is the final ground of the Bauer's Law? We conclude by exploring some hypothesis.

Affiliated with

Also associated with

No associations

Rating

Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oedometric Test, Bauer's Law and the Micro-Macro Connection for a Dry Sand will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-588767