



















^ 































SC-18 (0.0663 in./secl -^^^ ^ 



y^^^ 















































y^.^ 













/V^"^~~ SC-19 (0.0252 in./secl 









































































^^^ 











y^ 













^/^ 













// 













// 













{ 













Plate Settlement (inches) 



Figure 12. Bearing pressure versus plate settlement, indicating lack of testing 

 rate effect, Series III. 



Figure 14 presents a comparison of the Series II I test results on the 

 basis of plate size. Each pressure— settlement curve shown represents an 

 average of the curves for a particular plate diameter or width for tests SC-17 

 through SC-29. The results of tests SC-1 thorugh SC-1 6, which were consid- 

 ered to be less accurate because of instrumentation difficulties, are not 

 included although their trend does not differ from that of the later test 

 results. 



A significant feature evident from Figure 14 is that the plate size 

 does not seem to be an important parameter in determining the pressure- 

 settlement curves at this test site. The variation among these curves is not 

 any greater than the variation among curves for tests with identical param- 

 eters. This trend is considerably different from the observed behavior at 

 the Series I site where settlements consistently increased with plate size for 

 the same bearing pressure. 



Figure 15 presents the four usable pressure— settlement curves for 

 the Series IV tests. If, as suggested by earlier results, the effect of settlement 

 rate is neglected, then the results of these tests performed with four different 

 plate sizes present another opportunity to compare curves on the basis of 



15 



