A consolidation test has been performed on a sample of soil obtained from Point A in Figure 11.6. The test results are shown in Figure 11.9. Compute σ'c using Casagrande's method, then adjust the test results using Schmertmann's method. Finally, compute Cc and Cr.

Question

A consolidation test has been performed on a sample of soil obtained from Point A in Figure 11.6. The test results are shown in Figure 11.9. Compute [latex]\sigma ^{\prime }_{c}[/latex] using Casagrande's method, then adjust the test results using Schmertmann's method. Finally, compute [latex]C_{c}[/latex] and [latex]C_{r}[/latex].

Accepted Answer

Stresses at sample depth:

From Example 11.2:

[latex]\sigma ^{\prime }_{z0}=69 kPa[/latex]

From the Casagrande construction (Figure 11.16):

[latex]\sigma ^{\prime }_{c}=140 kPa[/latex]

Slopes of the reconstructed lines (Figure 11.16):

[latex]C_{c}=\frac{e_{a} - e_{b}}{\left(\log \sigma ^{\prime }_{z}\right)_{b} - \left(\log \sigma ^{\prime }_{z}\right) _{a}} =\frac{1.43 - 0.84}{\log 1580 lb/ft^{2} - \log 250 lb/ft^{2}} =[/latex] 0.74

[latex]C_{r}=\frac{e_{c} - e_{d}}{\left(\log \sigma ^{\prime }_{z}\right)_{d} - \left(\log \sigma ^{\prime }_{z}\right) _{c}} =\frac{1.58 - 1.46}{\log 1000 lb/ft^{2} - \log 100 lb/ft^{2}} =\frac{0.12}{1} =[/latex] 0.12

Question 11.3: A consolidation test has been performed on a sample of soil ...

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