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The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.36 (1989/12) >

 
Title :島尻層泥岩の力学挙動に関する数値シミュレーション(農業工学科)
Title alternative :Numerical simulations for mechanical behaviours of Shimajiri mudstone (Department of Agricultural Engineering)
Authors :上野, 正実
小宮, 康明
Authors alternative :Ueno, Masami
Komiya, Yasuaki
Issue Date :5-Dec-1989
Abstract :本研究では,島尻層泥岩に関する力学的問題の有限要素解析を実行するための準備として,弾塑性構成式の導入とその適用性の確認を行なった。泥岩の低応力状態での塑性挙動等を下降伏面モデルに基づく構成式により表現することを主眼とした。数値シミュレーション結果と実測値の比較によって,三軸圧縮過程についてはかなり精度よく表現できることが明らかとなった。今後,この構成式を用いた有限要素法のプログラムを用いて斜面の安定問題あるいは掘削の問題等を解析し,合理的な設計法の開発を行なう予定である。弾塑性構成式の精度を向上させ泥岩の変形挙動を適切に表現するためには継続的な研究が必要である。
Some deformation behaviours of the Shimajiri mudstone were simulated by an elastoplastic constitutive equation and the availability of it was checked for appling to finite element methods. An genelarized elastoplastic constitutive equation was formulated based on the subyield surface model which represented smooth transition from elastic state to plastic state. The associated flow rule was adopted to the subyield surface which was a function of current stress and similar to the yield surface in this formulation. Numerical simulations were carried out to some triaxial compression processes. Stress-strain relations predicted by this equation were fit well to measured those. Therefore this equation is able to use the simulation of mechanical behaviours both soil and mudstone only replacing material parameters. Some modifications have to need, however, to represent deformation behaviours of mudstone more accurately.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3880
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.36 p.99 -106
Appears in Collections:No.36 (1989/12)

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