花崗岩中に発達するmicro-crack系の性状とその定量評価の二,三の試み

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Micro-crack system in granitic rock was observed by means of scanning electron microscope, liquid penetrant test, soft X-ray photograph and polarized microscope with the following results; (1) The liquid penetrant test is useful to observe the micro-crack system. (2) The surface of micro-crack has generally irregular form probably due to the secondary mineral growth or corrision by the infiltration of ground water. The evaluated results of the micro-crack system by statistical methods are as follows; (1) The width distribution of micro-crack can be represented by N(t)Δt=K・t^<-m> Δt, where, K,m are the constants, t is the width and N(t)Δt is the number of micro-cracks in the distance between t and t+Δt. (2) The m-value in the above equation tends to decrease with the increase of rock porosity. (3) Only slight variations of the area of crack surface in a unit volume and the length of crack in a unit area are recognized in granitic rocks on the porosity of which ranges from 0.76% to 2.79%.
一般社団法人日本応用地質学会の論文
1979-06-30