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Question 11.4: Using the consolidation test results developed in Example 11...

Using the consolidation test results developed in Example 11.3, determine whether the soil at point A in Figure 11.6 is normally consolidated or overconsolidated. The proposed fill has not yet been placed.

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The soft clay described in Example 11.5 has Cα/(1+eP) = 0.018. Assuming the consolidation settlement will be 95 percent complete 40 years after the fill is placed, compute the secondary compression settlement that will occur over the next 30 years.

Verified Answer:
\delta _{s}=\frac{C_{\alpha }}{1+e_{p}} H\l...

Compute the ultimate consolidation settlement due to the weight of the fill shown in Figure 11.22.

Verified Answer:
Using program FILLSETT- see screen capture in Figu...

After the settlement due to the fill described in Example 11.5 is completed, a 20 m diameter, 10 m tall cylindrical steel water tank is to be built. The bottom of the tank will be at the top of the fill, and it will have an empty mass of 300,000 kg. Ultimately, the water inside will be 9.5 m deep.

Verified Answer:
Strategy The settlement due to the fill is now com...

The groundwater table in the soil profile shown in Figure 11.21 is currently at the elevation labeled “initial.” A proposed dewatering project will cause it to drop to the elevation labeled “final.” Compute the resulting ultimate consolidation settlement. A consolidation test performed on a sample

Verified Answer:
At sample A \sigma ^{\prime }_{z0}=\sum{\ga...

An 8.5 m deep compacted fill is to be placed over the soil profile shown in Figure 11.20. Consolidation tests on samples from points A and B produced the following results: Compute the ultimate consolidation settlement due to the weight of this fill.

Verified Answer:
Using Equation 11.2: \sigma ^{\prime }_{zf}...

A 3.0 m deep compacted fill is to be placed over the soil profile shown in Figure 11.19. A consolidation test on a sample from point A produced the following results: Cc = 0.40 Cr = 0.08 e0 = 1.10 σ’c = 70.0 kPa This sample is representative of the entire soft clay stratum. Compute the ultimate

Verified Answer:
Using Equation 11.2: \sigma ^{\prime }_{zf}...

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.

Verified Answer:
Stresses at sample depth: From Example 11.2: [late...

The element of soil at point A in Figure 11.6 is initially subjected to the following stresses:

Verified Answer:
\sigma _{z0}=\sum{\gamma H} =\left(18.7  kN...

A 5.0 ft thick fill is to be placed on a site underlain by medium clay, as shown in Figure 11.3. Compute σ’z0 and σ’zf at Point A.

Verified Answer:
\sigma ^{\prime }_{z0}=\sum{\gamma H  -  u}...