Question 31.1: The SPT(N ) value at the pile tip is 10 blows per foot. Find...

Geotechnical Engineering Calculations and Rules-of-Thumb

The SPT(N ) value at the pile tip is 10 blows per foot. Find the ultimate end bearing capacity of the pile assuming that pile tip is in pure sand and the diameter of the pile is 1 ft.

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Question: 31.9

Find the skin friction and end bearing capacity of the pile shown in Fig. 31.17. Assume that the critical depth is achieved at 20 ft into the bearing layer (NAVFAC DM 7.2, 1984). The pile diameter is 1 ft, and other soil parameters are as shown in Fig. 31.17. ...

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The skin friction is calculated in the overburden....

Question: 31.7

Find the tip resistance of the 2 ft (0.609 m) diameter pile shown in Fig. 31.11 using the Meyerhoff equation. The SPT (N) value at the pile tip is 25 blows per foot. ...

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Question: 31.6

This example concerns multiple sand layers with groundwater present. A 0.5 m diameter, 15 m long round concrete pile is driven into a sandy soil stratum as shown in Fig. 31.10. The groundwater level is 3 m below the surface. Compute the ultimate bearing capacity of the pile. ...

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STEP 1: Compute the end bearing capacity.

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Question: 31.5

This example concerns multiple sand layers with no groundwater present. A 0.5 m diameter, 12 m long round concrete pile is driven into a sandy soil stratum as shown in Fig. 31.9. Compute the ultimate bearing capacity of the pile. ...

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STEP 1: Compute the end bearing capacity.

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Question: 31.4

This example concerns a single pile in a uniform sand layer, for the case where there is groundwater present. A 0.5 m diameter, 10 m long round concrete pile is driven into a sandy soil stratum as shown in Fig. 31.8. The groundwater level is located 3 m below the surface. Compute the ultimate ...

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STEP 1: Compute the end bearing capacity.

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Question: 31.8

Find the skin friction of the 2 ft diameter pile shown in Fig. 31.12 using the Meyerhoff equation. The average SPT (N) value along the shaft is 15 blows per foot. ...

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Ignore the skin friction in the fill material. For...

Question: 31.3

This example covers a single pile in a uniform sand layer for the case where no groundwater is present. The diameter of the round steel pipe pile is 0.5 m (1.64 ft), and it is 10 m (32.8 ft) long. The pile is driven into a sandy soil stratum as shown in Fig. 31.7. Compute the ultimate bearing ...

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STEP 1: Compute the end bearing capacity.

...

Question: 31.2

Find the end bearing capacity of a 3 ft (1 m) diameter caisson using the Kulhawy values from Table 31.2. Assume the soil is saturated at the tip level of the caisson and the average SPT (N) value at the tip level is 10blows/ft. See Fig. 31.5. ...

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An average N value of 10 blows per foot can be con...