STRENGTH AND DEFORMATION CHARACTERISTICS OF SAND IN PLANE STRAIN COMPRESSION AT EXTREMELY LOW PRESSURES

概要

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A series of drained plane strain compression tests was performed on saturated samples of fine angular to sub-angular sand at confining pressure from 0.05 kgf/cm^2 (4.9 kN/m^2) up to 4.0 kgf/cm^2 (392 kN/m^2). Samples were prepared by the air-pluviation method with changing the angle δof bedding plane to the σ_1'-direction during plane strain compression tests from 0 to 90 degrees. It was found that in the plane strain compression tests the dependency of φ=arcsin {(σ_1'-σ_3')/(σ_1'+σ_3')}_<max> on σ_3' is very small when σ_3' is lower than around 0.5 kgf/cm^2 as well as in the triaxial compression tests. Strong strength anisotropy was observed; φ has its minimum at δ between 23° and 34°. It was also found that this minimum value of φ in plane strain compression is similar to φ at this value of δ in triaxial compression. The tendency of such strength anisotropy was found rather insensitive to stress levels employed (σ_3'=0.05〜4.0 kgf/cm^2). The stress-dilatancy relation at the peak stress condition was found to be a strong function of δ whereas this relation was insensitive to the change of σ_3'. The change of the deformation characteristics of sample with the change of σ_3' was found to be rather small when σ_3' is lower than around 0.5 kgf/cm^2 as well. It was found that the strength anisotropy and deformation anisotropy as a function of δ are somewhat different.
社団法人地盤工学会の論文
1986-03-15