Yuji Kishino

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International Journal of Solids and Structures | 2003

Kenji Kaneko; Kenjiro Terada; Takashi Kyoya; Yuji Kishino

Abstract A method of global–local analysis is developed for quasi-static equilibrium problems for granular media. The two-scale modeling based on mathematical homogenization theory enables us to formulate two separate boundary value problems in terms of macro- and microscales. The macroscale problem governs the equilibrium of a global structure composed of granular assemblies, while the microscale one is posed for the particulate nature of a local structure with the friction-contact mechanism between particles. The local structure is identified with a periodic representative volume element, or equivalently, a unit cell, over which averaging is performed. The mechanical behavior of unit cells is analyzed by a discrete numerical model, in which spring and friction devices connect rigid particles, whereas the continuum-based finite element method is used for the macroscopic one. Representative numerical examples are presented to demonstrate the capability of the proposed two-scale analysis method for granular materials.

Doboku Gakkai Ronbunshu | 1996

Toyohiko Watanabe; Yuji Kishino

トンネル掘削にともなう軟岩の安定性評価は, 軟岩の非弾性域における力学特性の多様性のために, 応力またはひずみに関する単独のパラメーターによる評価は困難である. そこで, 著者らはトンネル周辺岩盤になされる外部仕事や岩盤内部において散逸されるエネルギーに基づく評価方法を提案し, 支保の効果を無視した場合についてその有用性を示した. 本文は, この評価方法をトンネル周辺岩盤に対する内圧付加やロックボルトの効果を考慮した場合について拡張したものである. また, 各種岩のせん断試験結果より軟岩の力学特性をパラメーター的にモデル化し, 内圧付加の下におけるトンネル周辺軟岩の安定性の評価や, 支保セットのタイミングが岩盤の安定性に及ぼす影響等について検討を行った.

Computational Mechanics | 2006