不変量表示の応力ひずみ関係式--砂の場合

概要

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One of the main objects of soil engineering is the prediction of the behaviour of soil structures subjected to arbitraly loading. To make this prediction it is required to know the relationship between loading and deformation which is described by some constitutive equations. Some investigetors proposed their constitutive equations of soil materials based on both elasto-plastic theory and visco-plastic one. But, to author's knowledge, they have never succeeded in applying them to solve the field problems under both heterogeneous stress distribution and complex geometrical condition. So nonlinear elastic constitutive equations in terms of Invariants (i.e; octahedral stress and strain compornents) is proposed, whih is easely applied to solve the field problems by Finite Element Method of nonlinear elastic model. Obtaining the constitutive equations of Toyoura Sand by the experimental studies (i.e; Isotropic comp. test and Mean principal stress const. test), the calculated stress-strain curves are compared with the experimental values for Lateral pressure const. comp. test. And some of the deformation characteristics of Toyoura Sand under axisymmetric stress conditions is discussed. Furthermore, stress dependancy of coefficient of earth pressure at rest K0 is discussed theoretically, which is important in soil engineering design.
長崎大学工学部の論文