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STRENGTH PROPERTIES OF SHALE AND SILSTONE OF LAYERED STRUCTURE UNDER SHEAR LOADING
Abstract
The laboratory study was conducted to investigate the effect of the angle of stratification on the strength properties of samples of anisotropic shale and siltstone containing sandstone interlayers under shear loading with coupled compression in this paper. The samples of shale and siltstone were tested at various combinations of the orientation of bedding angles ? relative to the sample axis and the orientation of angles of shear plane ? relative to orientation of the stratification of samples. The experimental curves "ultimate shear stress ? ? normal stress ?" and the curves of cohesion C0 are obtained in dependence on different variations of bedding angles ? and the angles of shear plane ?. Research has led to the conclusion that the ultimate shear strength of shale and siltstone samples of layers structure is determined by the combination of the angles ? and ?. The angle ? has a much more significant effect on the ultimate shear strength than the values of normal stresses for the samples with bedding angle ?=0°. The combined effect is observed of the angle ? and the values of normal stresses ? on the destruction mechanism of the samples at values of bedding angle ?=45°. The ultimate shear strength does not depend on the angle ? and is determined only by the value of normal stresses for samples with the bedding angles ?=90°. The analysis of the dependences of the cohesion ?0 on the angles ? and ? allowed to conclude that bedding angle ? has a more significant effect on the cohesion for samples with bedding angle ?=0° in the interval of its increasing from ?=0° to ?=45° and for samples with the angle ?=45° in the interval of its increasing from ?=45° to ?=90°. It is obvious that shear angle ? has no effect on the value of the cohesion of samples with bedding angle ?=90°.
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