• 한국구조물진단유지관리공학회 논문집
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• 제5권3호
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• pp.233-244
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• 2001

Stress-strain behaviour of soil varies based on stress path and stress history. There has been few study on the characteristics of yielding curve which has anisotropic compression stress history in decomposed granite soil. During this study, various stress path tests in previous anisotropic compression stress history are performed on compacted decomposed granite soil sampled at Iksan, Chonbuk. Yielding points are determined from various stress-strain curves (${\eta}-{\varepsilon}$, ${\eta}$-v, and ${\eta}$-k, ${\eta}$-W curves). Stress-strain curve is certified which shows yielding point very clearly. The shape and characteristics of anisotropic compression yielding curves are examined. The main results are summarized as follows : 1) p' constant and compressive direction in stress paths, which has experienced previous anisotropic compression stress history, shows relatively dear yielding points. 2) Yielding curves defined from ${\eta}$-k and ${\eta}$-W curve show almost perfect ellipse. 3) Directions of plastic strain incremental vector($dv^p/d{\varepsilon}^p$) are not perpendicular to yielding curve.

• 한국농공학회지
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• 제44권1호
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• pp.103-115
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• 2002

During this study, various stress path tests in previous isotropic and anisotropic (compression and tension) stress histories are performed on weathered granite soil sampled at Iksan, Jeonbuk. Yielding points are determined from various stress-strain curves(stress ratio-shear strain, volumetric strain, normalized energy and dissipated total energy curves). The shape and characteristics of isotropic and anisotropic yielding curves are examined. The main results are summarized as follows . 1) Yielding curries defined from stress ratio - normarized energy and dissipated total energy curves show almost perfect ellipse. 2) Directions of plastic strain incremental vector are not perpendicular to yielding curve. 3) Normarized energy and dissipated total energy spread with similar tendency with respect to yielding currie in stress space.

• 한국지반공학회지:지반
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• 제13권4호
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• pp.149-162
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• 1997

주응력회전시 모래의 강도특성을 연구하기 위하여 일련의 응력경로에 대해 시험을 실시하였다. 이들 결과는 공시체의 높이에 따라 25cm와 40cm로 분류할 수 있으며 공시체에 작용된 토르 크(Torque)는 시계방향으로만 작용시켰다. 본 연구에서는 비 틀림전단시험시 주응력비에 대한 모래의 강도특성이 조사되었고 그 결과를 Lade의 파괴규준과 비교하여 보았다. 그리고 공시체높 이에 대한 영향을 고려하였다. 이들 시험결과로 부터 모래의 내부마찰각은 축차주응력비 $b:(\sigma_2 -\sigma_s)/(\sigma_2,-\sigma_3)$에 많은 영향을 받는 것으로 나타났다. 모래의 파괴강도는 응력경로에 영향을 받지 않고 현재의 응력상태에 의해 결정 되어지며 25cm와 40cm 높이의 공시체에 대한 비교로부터 단부구속의 영향은 발견할 수 없었다. 그리고 신장력이 작용된 b=0.5 이상인 시험에서는 변형을 국부현상에 의한 Necking현상이 발견되었다.