割れ目岩盤の性状および強度

概要

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Cracks and fissures contained in rock masses influence remarkably their own strength or drillability. Fissures have a primary influence on mechanical and elastic properties of rock. Such interrelation can be represented by the following empirical equation. n=5.0/(k+m)^2-4.0 Where, n: the frequency of fissures defined as the number of fissures per unit length (meter). k=v/V (v: the velocity of P-wave propagated in rock masses, V: the velocity of P-wave propagated in rock specimen) This ratio k gives the index to degree of fissuring. m: coefficient of uniformity, which depends on degree of weathering, porosity and strength. The strength of fissured rock masses Sf can be estimated as Sf=k^2S_s if the strength of non-fissured rock specimen S_s and the index to degree of fissuring k are assumed.
一般社団法人日本応用地質学会の論文
1979-12-30