agreement for Equations 6.15 and 6.16 is good for the three series except that the 

 formulas do not predict damage stabilization adequately. This deficiency becomes 

 much worse for b = 0.5. The calibrated value of ^ = 0.25 indicates that damage varies 

 less with time t in the long duration experiments using uniform-sized stone armor. The 

 calibrated values of a^ = 0.025 and a^ = 0.022 for b = 0.25 are much larger than a^ = 

 0.003 for b = 0.5 estimated using data from Table 6.1. This difference is mainly caused 

 by the different value of b. As an example, for t fT„ = 10,000, {t IT J = 10 or 100 for 

 b = 0.25 or 0.5. Consequently, the values of a^ and Op are coupled with the calibrated 

 value of b. 



10000 20000 30000 40000 50000 60000 



Number of Waves, Nw 



• measuredS -—• meas.g + os -°- measjS- os Eq.6.15 Eq.6.16 



Figure 6.7. Damage prediction relations compjired to data for Series A' 



125 



