花こう岩分離面のせん断特性に及ぼす表面性状と垂直応力度の影響

概要

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Joint planes used in this experimental study consisted of three artificial joints of extension fractured surface (EFS), sawn-cut surface (SCS), and polished surface (PS). Shearing experiment with test pieces about 60mm in diameter were performed under normal stress σ_N from 0.2 to 120kg/cm^2. The roughness of above three planes and natnral joints was measured by surface roughness meter (SE-0) as shown in Fig. 2. The relation between shearing strength τ_f and σ_N is shown in Figs. 4 and 5 for virgin shear of EFS, in Figs. 6 and 7 for repeated shear at first and second cycles of EFS, in fig. 9 for SCS, and in Figs. 11 and 12 for PS. Power law of friction may be suitable to express τ_f-σ_N relations (see Figs. 8 and 10). The dependence of frictional properties on normal stress is summarized in Fig. 13. From Fig. 13 the true frictional angle φ_μ may be about 25°-26°. Dilation angle dn° at peak shear stress has non-linier relation to secant, frictional angle φ_s of tan^<-1>(τ_f/σ_N) in Fig.19, which showes, though widely scattered, an important relation between φ_s and dn. The effect of filling materials on frictional resistance of joint is summarized in Fig. 21 according to surface roughness, particle size and moisture condition. Weathering less than about 7% in porosity may be negligible effect on shear strength, but effective on deformation properties.
一般社団法人日本応用地質学会の論文
1975-06-30