approach and one which should be developed if more refined predictions 

 are to be made would be a truly dynamic equation in which the dynamic 

 characteristics are introduced rigorously. 



The results of each penetration test were predicted using this 

 technique. Since both disturbed and undisturbed soil characteristics 

 and four values of soil viscosity coefficient, )j , were considered, 

 a total of eight predictions were developed for each test . To 

 minimize confusion the detailed results of only four test predictions 

 will be presented. The results of the predictions for the other tests 

 will be briefly summarized later. 



The four tests selected for detailed presentation are PT-1, 

 PT-4, PT-9, and PT-11. These tests include representatives of each 

 object-site condition. The results are presented in Figures 15 

 through 18 in the form of predicted acceleration-depth plots compared 

 with the measured curves. Each figure contains eight predicted 

 curves and one measured curve. 



Considering Figure 15 representing corer test PT-1 first, it is 

 noted that the predicted curves involving remolded strengths with 

 relatively small viscous coefficients {\i = 0.5-1.0 Ib-sec/ft-^) predict 

 the depth of penetration almost exactly. The curve with the high 

 viscous coefficient (y = 3.0 Ib-sec/ft^) and the undisturbed curves 

 are much poorer in their capability to predict the penetration depth. 

 However, none of the approaches actually predicts the shape of the 

 acceleration-depth plot very well. The good penetration depth 

 predictions achieved using remolded strengths with low viscosity 

 may be purely coincidental. 



In Figure 16 representing cone test PT-4, all of the predicted 

 curves have shapes which approximate the measured curve. The prediction 

 scheme which uses remolded strength and a soil viscosity coefficient, 

 y, of 1.0 yields the best prediction of penetration depth. All of 

 the schemes, however, yield penetration depths which are within 

 20 percent of the measured depth. 



In Figure 17 representing cone test PT-9, it is seen that the 

 prediction scheme using remolded strength and low viscosity (y = - 

 0.5 Ib-sec/ft-^) predicts the measured results almost exactly. The 

 undisturbed and higher viscosity curves are considerably less accurate. 



In Figure 18 representing corer test PT-11 the results are 

 similar to those for PT-1. The remolded, low viscosity predicted 

 curves are the most nearly accurate in terms of predicting penetration 

 depth while none of the curves are particularly accurate in terras of 

 reflecting the shape of the measured curves. 



In the calculation of the predicted penetration behavior for 

 the other tests, it was found that in all cases the shapes of the 

 predicted cone penetratometer acceleration-depth plots agreed well 

 with the shapes of the measured curves. The shapes of the predicted 

 corer tests did not agree well. A comparison of the predicted 

 penetration depths with the measured depths is presented in Table 10. 



17 



