Evolution of the deformation band in the numerical sandbox experiment with 2.4 billion DEM particles

Mikito Furuichi; Daisuke Nishiura; Osamu Kuwano; Takane Hori

Presentation information

[JJ] Oral

S (Solid Earth Sciences) » S-CG Complex & General

[S-CG74] [JJ] Rheology, fracture and friction in Earth and planetary sciences

Mon. May 22, 2017 10:45 AM - 12:15 PM A04 (Tokyo Bay Makuhari Hall)

convener:Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology), Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Hidemi Ishibashi(Faculty of Science, Shizuoka University), Miki Tasaka(Shimane University), Chairperson:Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

11:45 AM - 12:00 PM

[SCG74-11] Evolution of the deformation band in the numerical sandbox experiment with 2.4 billion DEM particles

*Mikito Furuichi¹, Daisuke Nishiura¹, Osamu Kuwano¹, Takane Hori¹ (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:accretionary prism, sandbox, DEM

We modeled a deformation mechanism of an accretionary prism using the numerical simulation of the sandbox experiment. We solved the motion of 2.4 billion solid particles with Discrete Element Method (DEM) on massively parallel supercomputer system. This huge number of particles enabled us to use the realistic parameters of the sand. Thus, we could successfully reproduce the prism evolution which was consistent with the lab sandbox experiment. One of the advantages of numerical simulation over the analog experiment is the ability to analyze the detailed deformation processes of the granular layer in 3D. We analyzed the mechanical state of particles inside the deformation band to reveal the relations between the growth mode and the wavelength of the deformation. From the results, we discuss the characteristic length to change the deformation mode between the discrete and continuous behaviors.