[CS2-06] Discussion on Joint Surface Roughness Coefficient evaluated through the root mean square method
キーワード：岩石不連続面、ラフネス、せん断挙動、JRC、Z2
The joint roughness coefficient (JRC) is one of the important parameters to evaluate the mechanical and the hydro mechanical behavior of rock joints. It can be calculated by the backward analytical method from the tilt test or the direct shear test. Another approach to predicting the JRC value is the root mean square (Z2) method. This paper compared two kinds of joint surfaces which have same mean inclination angle and different amplitudes. The experimental results showed that the same JRCs are found on the regular joint surfaces by the backward analytical method. But these values are larger than the results of Z2 method. The JRC values predicted by Z2 method may underestimate the shear strength.
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