岩石の異方性及びそれに対する吸水率の影響

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The deformation and movement developed by the geological structure in some regions yield faults, fractures, folds and so on. Therefore approach to the strength properties of rock mass is led by the understanding of the orientations of strength anisotropy of rocks due to these geological structures. In this paper the authors described the result of an experimental study on the change of strength and deformation characteristics with water absorption, taking their anisotropy into account. On the one hand tensile strength of rocks has been determined by the point load test on untrimmed test specimens to know the influence of water absorption to strength. On the other hand elastic wave velocities of specimens have been measured and the dynamic moduli E_d have been calculated in view of their deformation anisotropy. The tensile strength is denoted "σ_<ta>" and "σ_<tc>" respectively in the direction normal and parallel to the discontinuity planes such as joint surfaces. Similarly the dynamic modulus in the direction normal to the discontinuity planes is called "E_<da>" and that parallel to them "E_<dc>". The results obtained as to the dynamic modulus and point load test are summarized as follows:-(1) Degree of strength anisotropy shown by point load test, "σ_<ta>/σ_<tc>" and that by dynamic modulus, "E_<da>/E_<dc>" correlate nearly with a straight line. (2) While degree of anisotropy of dynamic modulus "E_<da>/E_<dc>" is decreased, that of strength anisotropy "σ_<ta>/σ_<tc>" is increased when water is taken into discontinuity planes.
一般社団法人日本応用地質学会の論文
1975-09-30

岩石の異方性及びそれに対する吸水率の影響

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