Toshikazu Kawamoto

Japan Society of Civil Engineers

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Yasuaki Ichikawa

Okayama University

ÖA

Ömer Aydan

University of the Ryukyus

Takashi KYOYA

Tohoku University

K. Tsumori

National Institute for Fusion Science

Yoshihide Oka

National Institute for Fusion Science

Sixiong Han

Saitama University

Yoshiji NIWA

Kyoto University

Y. Takeiri

National Institute for Fusion Science

Tomoyuki Akagi

Japan Society of Civil Engineers

E. Asano

National Institute for Fusion Science

Cooperative Institutions

Nagoya University

Japan Society of Civil Engineers

National Institute for Fusion Science

Japan Society

National Institutes of Natural Sciences

Kyoto University

The Graduate University for Advanced Studies, SOKENDAI

The University of Tokyo

Tohoku University

Kyushu University

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AN APPLICATION OF DAMAGE TENSOR FOR ESTIMATING MECHANICAL PROPERTIES OF ROCK MASS

Doboku Gakkai Ronbunshu (1985)

Takashi Kyoya Yasuaki Ichikawa Toshikazu Kawamoto

Distributed discontinuities essentially affect to the mechanical behaviour of rock mass. Such discontinuities can be modelled by introducing the damage tensor of Murakami et al. which was originally proposed for creep failure of metal-like materials. In this paper, the concept is extended to the rate-insensitive rock mass behaviour involving joint sets. An in-situ observation method of the damage tensor is proposed.

Classification of discontinuities

Geomechanics

10.2208/jscej.1985.358_27

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Citations (3)

A NUMERICAL EVALUATION METHOD OF WAVES IN ROCK MASS WITH CRACKS

Doboku Gakkai Ronbunshu (1989)

Sixiong Han Yasuaki Ichikawa Toshikazu Kawamoto

The problem of elastic wave travelling in rock mass that usually contains cracks, involves several difficulties from the theoretical point of view. In this paper, a new model to treat such problems is proposed, in which, instead of modelling the cracks directly, the mechanical effects of cracks are transformed into an equivalent nodal force in a numerical procedure. Accordingly, the response is obtained by the superposition of the incident wave field and the scattering wave field which is produced by the radiation of the reflected waves from the crack surfaces. Finally, a numerical example is given and it is shown that the calculated results by the proposed method is in very good agreement with those of the exact ones.

10.2208/jscej.1989.412_173

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Citations (2)

A review of numerical analysis of tunnels in discontinuous rock masses

International Journal for Numerical and Analytical Methods in Geomechanics (1999)

Toshikazu Kawamoto Ömer Aydan

Rock masses in nature contain numerous discontinuities in the form of cracks, joints, faults, bedding planes, etc. Therefore, various continuum equivalent models of discontinuum models have been proposed and used to assess the stability of rock tunnels since the beginning of 1970. In this article, a brief but comprehensive review of numerical analysis of tunnels in discontinuous rock masses is presented. Firstly, various discrete models are briefly described and their fundamental features are summarised. Then, equivalent continuum models are described and their fundamental assumptions are presented. And then a brief outline of hybrid models proposed in literature is given. Finally, some recommendations as to how to use these models in practice are made. Copyright © 1999 John Wiley & Sons, Ltd.

Classification of discontinuities

Bed

10.1002/(sici)1096-9853(199911)23:13<1377::aid-nag932>3.0.co;2-s

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Citations (16)

YIELDED PATTERNS IN THE STRUCTURAL STEEL MEMBERS (PHOTOELASTIC COATING STUDY)

Transactions of the Japan Society of Civil Engineers (1968)

Tutomu Usami Toshikazu Kawamoto Yuhshi Fukumoto

10.2208/jscej1949.1968.152_16

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STUDIES ON THE PHOTO-ELASTIC MEASUREMENT OF STRESSES IN A SOIL MASS

Transactions of the Japan Society of Civil Engineers (1959)

Sakuro Murayama Yoshiji NIWA Toshikazu Kawamoto

The authors studied on the applicability of photo-elastic method to the measurement of stresses in a soil mass. For this purpose, small cylindrical hollow pieces of photo-elastic material (Epoxy resin) were embedded in the dry sand mass, which was loaded by a rigid plate locally placed on its surface, and their stresses were frozen, then the stresses and their distribution in the sand mass were measured by taking out the pieces and analyzing their frozen stresses photo-elastically.As a result of the experiment above stated, it became clear that the directions of principal stress and the feature of stress distribution in the sand mass agreed well with the results calculated by Fröhlich's formula, but the measured magnitude of stress differed a little from the calculated one. But the difference in the stress magnitude can be corrected by multiplying an experimental coefficient K on the measured stress.

10.2208/jscej1949.1959.63_66

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THEORY FOR DETERMINATION OF THREE-DIMENSIONAL INITIAL STRESSES IN ISOTROPIC OR ANISOTROPIC ROCK MASSES BY PARTIAL STRESS RELIEF TECHNIQUES

Doboku Gakkai Ronbunshu (1994)

Shinji KIKUCHI Yukio Yamashita Ken-ichi HIRASHIMA Toshikazu Kawamoto

本論文は, 近接する2個のボアホールの応力干渉を利用した等方性または直交異方性弾性岩盤内の初期応力測定理論に関するもので, 一般的な三次元地圧下の6個の初期応力成分のうち, ボアホール軸に直交する面内の3成分および面外の2成分を一回の測定で決定する方法について論じたものである. さらに, ボアホール孔壁での感度係数に関する高精度の解析解を示すと同時に, これらを用いた具体的な初期応力の算定方法を提示した.

Stress Relief

10.2208/jscej.1994.493_39

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ON THE EFFECTS OF ANISTROPY ON DISPLACEMENTS IN FOUNDATION ROCK

Transactions of the Japan Society of Civil Engineers (1966)

Toshikazu Kawamoto

Foundation (evidence)

10.2208/jscej1949.1966.126_16

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3-D model for dynamic problem of cracked rock mass

CRC Press eBooks (2020)

Sixiong Han Toshikazu Kawamoto Takashi Ito

The problem of 3-D elastodynamic scattering from planar cracks is considered in displacement wave field. An analytical approach, called equivalent nodal force ( ENF ) method is proposed, in which the effect of cracks is formulated as a displacement gap in a wave field. Then, insteading of modelling the cracks directly it is shown that the effect of cracks can be transformed into equivalent nodal forces in a numerical procedure and conventional numerical method for continuum can be used.

10.1201/9781003078975-79

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ON THE EFFECT OF END RESTRAINT OF CYLINDRICAL BRITTLE SPECIMEN ON ITS STATES OF DEFORMATION AND COMPRESSIVE STRENGTH

Proceedings of the Japan Society of Civil Engineers (1969)

T. Kajita Masatugu Akimoto Toshikazu Kawamoto

Brittleness

10.2208/jscej1969.1969.166_27

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26aB01 High Power Beam Injection by using a New Negative Hydrogen Ion Source for LHD-NBI

プラズマ・核融合学会年会予稿集 (2003)