粗粒土の粒子配向に関する光学的研究

概要

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The problem of measuring the grain-orientation having somewhat significant influence on the mechanical properties of soil consists actually of the two interrelated problems, that is, the one is to prepare a specimen which preserves the fabric of the original sample, and the other is to examine the properties of grain which quantitatively express their geometrical arrangement. As the preliminary steps to solve these problems, gelling-time of epoxy resin (U-Loid) was utilized to solidify the specimens sheared to different points along the stress-displacement curve, besides this the birefringence of grain-aggregate was employed to measure the grain orientation. The conclusions obtained can be summarized as follows. The circular normal distribution function is introduced for a model of grain-orientation. This model leads to a relation between birefringence ratio (β), which is to be defined by the ratio between min. and max. intensities of light passed through that model, and the variable of function (κ) which expresses the degree of the grain-orientation. From this theoretical relationship, the grain orientation is fixed to be random when κ=0 and the birefringence-ratio takes the value of unity. When κ=∞, birefringence ratio takes zero, with a perfect parallel orientation. Intermediate values of β are to be associated with aggregates whose degree of orientation is less than the perfect orientation. Since another relation of grain-orientation expressed by the vector strength (a^^-) is given by 0≨a^^-≨1 for 0≨κ≨∞, the mutual relationship of β and a^^- is 1≩β≩0⇄0≨κ≨∞⇄0≨a^^-≨1. This theoretical results are to be restricted to the grains having the optical axes coinciding with the crystallographic axes, and the limited experimental data can be used for illustrating the behaviour of the grain during the shearing.
鹿児島大学の論文
1980-03-19

著者

三輪晃一
農地工学研究室

粗粒土の粒子配向に関する光学的研究

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