00317577

open access

Version of Record

コウベ ソウグン アイナ ルイソウ デイガン ノ ハイスイ センダン キョドウ

Drained shear behaviour of mudstone of Aina Formation, Kobe Group

Japanese (日本語)

神戸大学都市安全研究センター研究報告

6

105-111

神戸大学都市安全研究センター

2002-03

2007-04-13

This paper describes the drained shear behaviour of Kobe-Aina mudstone sampled at a Construction site in Kobe city based on the test results of a consolidated-drained triaxial compression test and a consolidated, drained triaxial compression test with mean principal stress constant. The followings can be drawn. From the relationships between deviatoric stress and axial strain, the mudstone shows a significant strain-softening behaviour along with dilatancy for an effective confining stress and/or effective mean principal stress from 0.49 to 1.96 MP. The shear modulus, G, and bulk modulus, K, both increase with mean effective principal stress and are expressed by a power function. The shear strengths for the peak and residual states are represented by linear relationships of deviatoric stress and mean principal stress in both-logarithmic coordinates and are expressed in the form of a power function. The yield surface is not influenced by the difference of stress path, and there exists a linear relationship between the plastic strain increment ratio, dev^p/del^p, and the stress ratio, q/p, at yielding.

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