Indicates test discontinued 

 before occurrence of breakout 



Dashed-line band represents 

 Equation 6 plus or minus one- 

 half log cycle of the normalized 

 time 



Normalized Breakout Time, T = 



P^b/BV 



(log scale) 



Figure 4. Relative force versus normalized breakout time — FY-71 long-term 

 laboratory tests. 



It is felt, however, that the present conditions are sufficiently accurate 

 for estimating the order of nnagnitude of breakout time. The Gulf of Mexico 

 and San Francisco Bay soils are representative of typical deep-sea deposits, so 

 correlations based on these data can be extrapolated to other sites. The FY-71 

 laboratory data have a high enough correlation to provide a good indication of 

 the proper form of the breakout time relationship. 



The procedure followed was to fit an equation to the FY-71 test data 

 accurately and then shift this equation slightly by altering one parameter to fit 

 the field test data. The test data suggested a log— log form; therefore, a rela- 

 tionship for the FY-71 data was determined to be 



loQio -^ = -0.193(10910 T - 4.24) 



(6) 



where T = (ptJD^) (B/D)^ 



23 



