to,-20) +2

Figure 10.13 show that the shear strength of a rough joint is .... linear elasticity. A satisfactory ... that an appropriate solution is being applied to each design .... practical manual on underground excavations.62 This further ... be predicted in advance, and for this reason the method has ...... Proceedings, 4th international.
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where an' is effective normal stress, JRC is joint roughness coefficient on a scale of 1 for the smoothest to 20 for the roughest surfaces, JCS is joint wall compressive strength and ^/ is drained, residual friction angle. This equation suggests that there are three components of shear strength - a frictional component given by r', a geometrical component controlled by surface roughness (JRC) and an asperity failure component controlled by the ratio (JCS/crn'). As Figure 10.13 shows, the asperity failure and geometrical components combine to give the net roughness component /. The total frictional resistance is then given by (