The inclination factor i presents a problem in that at least three expres- 

 sions are available yielding widely differing values for the loading con- 

 dition of interest. Values vary from 0.25 to 0.7. The authors have 

 relied on the expression of Hansen (1970) for the plane strain condition 

 yielding i = 0.5 for the OTEC anchor limiting conditions. This assumption 

 may be unconservative in view of Meyerhof's (1963) results and does require 

 verification. 



The compressibility factors assumed also require verification because 

 of the uncertainty in the assumed soil shear modulus, G, for the sediments 

 in question. Reliable estimates of the soil shear modulus, G, are required 

 in order to select reliable compressibility factors. Those factors that 

 were selected and listed in Table 17 are best estimates given the available 

 information, but they do require in-depth review. 



Results . 



1. Cohesive, the bearing capacity analysis indicates that those 

 deadweight anchors on cohesive materials will not fail in a bearing capacity 

 mode. Figure 51 illustrates the relationship of bearing capacity, Q, to the 

 lateral load capacity, R[_, as a funciton of anchor width, B, on a category A 

 soil, the bearing capacity, Q, was calculated assuming the load's resultant 

 applied to the soil was inclined at 0.79 rad (45 deg). The deadweight was 

 also assumed loaded to ultimate laterally or Ph (load) = Rl, (ultimate). 

 Then given the resultant inclination of 0.79 rad, the vertical load com- 

 ponent, R v , for the analysis is equal to the lateral load capacity, Rl. 

 Thus, the Rl curve in Figure 51 also represents the vertical load component 

 R v , applied in the anlysis. Obviously, the bearing capacity, Q, exceeds 

 the applied vertical load component, R v , by some 750 percent, thus failure 

 in a bearing capacity mode is yery unlikely. 



Figure 51 also addresses the driving force necessary to embed the 

 cutting edges, Q e - Qe is shown to be slightly greater than the vertical 

 load component. Rv = Rl. assumed in the bearing capacity analysis. The 

 deadweight anchor would have to weigh the greater amount, Q e , in order to 

 embed the cutting edges. This anlysis assumes a zero degree mooring line 

 angle, thus no additional weight is required to balance a vertical component 

 from the mooring line. The submerged weight required for other mooring line 

 angles (assuming H/B = Z/B = 0.1) is given by: 



R = R + R tan g but not less than Q (24) 



K L L " 



where R D = Required submerged weight (N) 



K 



B = Mooring line angle with the seafloor (rad) 



Note that the bearing capacity plotted in Figure 51 was based on an 

 assumed submerged weight equal to the applied lateral load. A more precise 

 value of bearing capacity could now be calculated using the required 

 submerged weight (R R ) as the vertical load. This was not done since the 

 resulting change in bearing capacity is minimal . 



102 



