Joints roughness coefficient

The Barton-Bandis (BB) model represents the change in the normal and shear stiffness due to the stress change by using JRC (Joint Roughness Coefficient) and JCS (Joint Compression Strength). By using the JRC and JCS (MPa) which is the mean values for each set /, the initial normal stiffness of joint, K i (MPa/mm), is calculated for each set /,... 

For Case HM, pairs of joint roughness coefficient (JRC) and joint compressive strength... 

Zhou Chuangbing Xiong Wenlin. 1996. Relation between joint roughness coefficient and fractal dimension. J. Wuhan Univ. of Hydr. Elec. Eng. 29(5) pp. 1-5... 

Generally, JMC values can be estimated from the percentage of the joint connection area. Also, the JMC value of the fresh joint is greater than the natural one. Meanwhile, the fresh joint also has higher roughness, i.e. JRC value. Incorporating the JRC and JMC coefficients could better represent the geometry characteristics of the joint surface, thus to determine the hydro mechanical property. 

Eq. (1) is recast into Eq. (9), assuming that, in the presence of adhesive, the friction coefficient value can be considered equal to that relevant to the dry joint. Such occurrence is due to the fact that metals remain in contact in the peaks of the roughness, while the liquid adhesive fills the voids of all depressions [1]. Therefore, Fad can be calculated as the difference between the measured overall strength of the joint (Ftot) and the assumed frictional... 

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