###### Introduction to Geotechnical Engineering

116 SOLVED PROBLEMS

Question: 14.5

## Repeat Example 14.4 and use Coulomb’s active pressure for calculation and δ′ = 2φ′/3. ...

Refer to Figure 14.14 for the pressure calculation...
Question: 14.6

## Determine the safety factors for the cantilever retaining wall shown in figure 14.16 with respect to sliding and overturning, using Coulomb’s active earth pressures. Assume δ′ is 24° and the unit weight of concrete is 24 kN/m³. How would you improve the stability of this wall? ...

From Table 11.4 for α = 10°, φ′ = 36° and δ′ = 24°...
Question: 14.4

## A concrete gravity retaininvg wall is shown in Figure 14.13. Determine: a. The factor of safety against overturning b. The factor of safety against sliding c. The pressure on the soil at the toe and heel (Note: Unit weight of concrete = γc = 150 lb/ft³.) ...

$H^\prime =15+25=17.5$ ft K_a=...
Question: 14.3

## In Example 14.2, if there is a possibility that the soil in front of the wall will be removed sometime later, neglect the passive resistance and compute the factors of safety. ...

The passive resistance $P_p$ was not ...
Question: 14.2

## Figure 14.11 shows a gravity retaining wall for a granular (c′ = 0) backfill. The same soil is present at the bottom of the wall and on the left. The unit weight and the friction angle of the backfill are 18.5 kN/m³ and 35°, respectively. The unit weight of the concrete is 24.0 kN/m³. Determine ...

The retaining wall and the soil regions of interes...
Question: 14.1

## The cross section of a cantilever retaining wall is shown in Figure 14.10. Calculate the factors of safety with respect to overturning, sliding, and bearing capacity. Use 150 lb/ft³ for the unit weight of concrete. ...

Refer to Figure 14.10. Note that H^\prime =...
Question: 12.6

## A square foundation is shown in Figure 12.9. Assume that the load eccentricity e = 0.5 ft. Determine the ultimate load, Qult. ...

With c′ = 0, Eq. 12.20 becomes q_u^\prime =...
Question: 12.5

## A 2 m × 3 m spread foundation placed at a depth of 2 m carries a vertical load of 3000 kN and moment of 300 kN⋅m, as shown in Figure 12.8, Determine the factor of safety. ...

From Eq. (12.17), eccentricity e =\frac{M}{...
Question: 12.4

## A continuous foundation is shown in Figure 12.7. If the load eccentricity is 0.5 ft, determine the ultimate load, Qult, per unit length of the foundation. ...

With c′ = 0, Eq. (12.20) gives q_u^\prime =...
From Eq. (12.7), noting that F_{ci} = F_{qi...