###### Introductory Geotechnical Engineering

30 SOLVED PROBLEMS

Question: 15.1

## Compute pile capacity of identical piles in the same soil A = cross-sectional of 20-in. square pile = 400 sq. in. (2580 cm²) L = length of the pile = 40 ft (12.2 m) W = weight of ram = 3.75 tons (33.4 kN) P = weight of pile = 8.25 tons (73.4 kN) h = fall of ram = 4.0 ft (1.22 m) H = 12 h, the ...

1       By the Engineering News formula (Eq. (15.8...
Question: 5.1

## Derive the Equation (5.5), the capillary rise in soil ...

Surface tension of water, T_{s} \text{ at }...
Question: 2.3

## For the soil described in Example 2.2, (liquid limit, ωL=38, plasticity index, IP = 21, and 82% passing #200 sieve), use the AASHTO table and USDA soil triangle to make a classification. Additional information: 20% sand, 60% silt, and 20% clay. ...

Using Table 2.4, when $ω_{L}=38$, and...
Question: 5.2

## A soil specimen 10 cm (3.9 in.) in diameter and 5 cm (2.0 in.) in length was tested in a falling-head permeameter. The head dropped from 45 cm (17.7 in.) to 30 cm (11.8 in.) in 4 min and 32 s. The area of the standpipe was 0.5 cm² (0.078 in.²) a What was the capillary rise of water in the standpipe ...

A=\Pi r^{2} =\left(3.1416\right) \left(5.0\...
Question: 7.3

## Compute the compactive effort (CE) for a Standard Proctor Compaction Test (ASTM D698). ...

From Equation (7.3) and based on data from Table 7...
Question: 8.1

## Given a 4 in. × 4.6 in. compacted soil specimen prepared from standard AASHTO compaction procedure.Determining the tensile strength by use of the UP test ...

From Equation (8.2) where Diameter of soil specime...
Question: 7.5

## Dynamic compaction To prepare the subgrade for a section of Interstate 65 in Alabama, dynamic deep compaction was selected to improve cone penetration values, qc from values as low as 25 kg/m² to greater than 100 kg/m². A conventional crawler crane was used to drop a 20 ton circular weight ...

Using Equation (7.21) (see Table 7.4), we have: [l...
Question: 15.2

## Friction pile of a 24-in.² (154.8 cm²) reinforced concrete section are to be used with an embedded length of 40 ft (12.2 m) in a soft clay layer. The clay is known to have an unconfined compressive strength of 800 psf (38.3 kPa) and to be very uniform throughout the deep layer. An isolated footing ...

a     Allowable bearing capacity of a single pile ...
Question: 14.4

## (After Koppula, 1984) Consider a cohesive slope of height, H inclined at 60° to the horizontal. Let the shear strength of the soil be given by a0/ γ = 0.02 and c0 / γ H = 0.3. Determine the factor of safety, Fs, when the seismic coefficient A = 0 (no earthquake) and A = 0.4 g (strong earthquake), ...

When $\beta =60°$ and the seismic coe...