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| 1.
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志比, 利秀 ; 矢富, 盟祥
概要:
This paper examines the diffuse bifurcation mode of a hollow circular cylinder specimen consisting of a non-coaxial Cam-
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clay model. The specimen undergoes a non-axisymmetric deformation by a prescribed velocity with no friction on the ends and a constant lateral hydrostatic pressure on the side. We obtain several bifurcation loads and examine the sites where the slip planes first occur from the maximum shear strain point of view.<br />出版者照会後に全文公開
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| 2.
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論文
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志比, 利秀 ; 矢富, 盟祥
概要:
This paper examines the diffuse bifurcation mode of a hollow circular cylinder specimen consisting of a non-coaxial Cam-clay model. The specimen undergoes a non-axisymmetric deformation by a prescribed velocity with no friction on the
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ends and a constant lateral hydrostatic pressure on the side. We obtain several bifurcation loads and examine the sites where the slip planes first occur from the maximum shear strain point of view.
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| 3.
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志比, 利秀 ; 亀井, 健史 ; 矢富, 盟祥
概要:
This paper investigates inhomogeneous deformation behavior of clay under the plane strain undrained extension loadings based on bifurcation theory. Constitutive equations of clay are applied for a coaxial and a non-coaxial
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Cam-clay model. Development locations and forms of slip surfaces are estimated based on distribution of maximum shear strain at the occurrence of bifurcation. Bifurcation stress ratios with lower symmetric modes are smaller under extension loadings than any other mode. The smallest bifurcation stress ratio under extension loadings is larger than the smallest ratio under compression loadings. However, bifurcation stress ratio in extension tests is smaller than in compression tests in the case of lower symmetric modes that the influence of the allowable eccentric load is small. Slip surfaces observed under compression loadings develop from the center of the inside to the side in the end face at top and bottom. In extension tests, however, slip surfaces develop from the exterior at the point of greatest narrowing to the inside.
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| 4.
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志比, 利秀 ; 矢富, 盟祥
概要:
This paper examines the diffuse bifurcation mode of a two-layer specimen consisting of a non-coaxial Cam-clay model. The specimen undergoes a deformation by a prescribed velocity with no friction on the ends and a constant lateral
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hydrostatic pressure on the sides. We obtain several bifurcation loads and examine the effect of several material parameters on the bifurcation load. We finally investigate the sites where the slip planes first occur from the maximum shear strain point of view.
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| 5.
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論文
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志比, 利秀 ; 矢富, 盟祥 ; 亀井, 健史
概要:
This paper examines the influences of the aspect ratio on the bifurcation analysis for a non-coaxial and a coaxial Cam-clay model of normally consolidated clays during undrained shear under plane strain condition. The bifurcation
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analyses are carried out considering the difference between the aspect ratio at the onset of bifurcation and the initial aspect ratio. As a result, we show the existence of the symmetric bulging mode, which is often observed in the experiment. We also examine the sites where the slip surfaces first occur and the patterns of the slip surfaces by judging from the distributions of maximum shear strain.
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