JpGU-AGU Joint Meeting 2017

講演情報

[JJ] 口頭発表

セッション記号 S (固体地球科学) » S-CG 固体地球科学複合領域・一般

[S-CG74] [JJ] 地球惑星科学におけるレオロジーと破壊・摩擦の物理

2017年5月22日(月) 10:45 〜 12:15 A04 (東京ベイ幕張ホール)

コンビーナ:桑野 修(国立研究開発法人 海洋研究開発機構)、清水 以知子(東京大学大学院理学系研究科地球惑星科学専攻)、石橋 秀巳(静岡大学理学部地球科学専攻)、田阪 美樹(島根大学 )、座長:桑野 修(国立研究開発法人海洋研究開発機構)

11:45 〜 12:00

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

*古市 幹人1西浦 泰介1桑野 修1堀 高峰1 (1.海洋研究開発機構)

キーワード:付加体、砂箱実験、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.