Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering 1st. Edition by Murthy, V.N.S. | 9780824708733 | 824708733 | Holooly

Geotechnical Engineering: Principles and Practices of Soil Mechanics and Foundation Engineering [EXP-45222]

281 SOLVED PROBLEMS

Question: 19.5

(Koerner, 1999) Design a 7m high geogrid-reinforced wall when the reinforcement vertical maximum spacing must be 1.0 m. The coverage ratio is 0.80 (Refer to Fig. Ex. 19.5). Given: Tu = 156 kN/m, Cr = 0.80, Ci = 0.75. The other details are given in the figure.

Verified Answer:

Internal Stability From Eq. (19.14)

...

Question: 17.11

(O’Neill and Reese, 1999) Refer to Fig. Ex. 17.11. Determine for a free-head pier (a) the groundline deflection, and (b) the maximum bending moment. Use the Duncan et al., (1994) method. Assume Rf = 1 in the Eqs (17.44) and (17.45).

Verified Answer:

Substituting in Eqs (17.42) and (17.43) [la...

Question: 3.12

500 g of dry soil was used for a sieve analysis. The masses of soil retained on each sieve are given below:

Verified Answer:

Computation of percent finer US standard sieve D...

Question: 9.2

75 mm is the external diameter of a sampling tube. If the area ratio required is 20%, determine the thickness of the sampling tube. In what type of clay would such a high area ratio be required?

Verified Answer:

A_{r}=\frac{75^{2}-d_{i}^{2}}{d_{i}^{2}}=0....

Question: 7.8

A 2.5 cm thick sample of clay was taken from the field for predicting the time of settlement for a proposed building which exerts a uniform pressure of 100 kN/m^2 over the clay stratum. The sample was loaded to 100 kN/m^2 and proper drainage was allowed from top and bottom. It was seen that 50

Verified Answer:

T for 50% consolidation = 0.197. The lab sa...

Question: 6.11

A 3 m high embankment is to be constructed as shown in Fig. Ex. 6. 11. If the unit weight of soil used in the embankment is 19.0 kN/m^3, calculate the vertical stress due to the embankment loading at points P1, P2, and P3.

Verified Answer:

q=\gamma H=19 \times 3=57 kN / m ^{2}, z=3 ...

Question: 5.12

A 39.4 ft thick layer of relatively impervious saturated clay lies over a gravel aquifer. Piezometer tubes introduced to the gravel layer show an artesian pressure condition with the water level standing in the tubes 9.8 ft above the top surface of the clay stratum. The properties of the clay are

Verified Answer:

(a) At the top of the gravel stratum

\sigma...

Question: 15.22

A 40 x 40 cm reinforced concrete pile 20 m long is driven through loose sand and then into dense gravel to a final set of 3 mm/blow, using a 30 kN single-acting hammer with a stroke of 1.5 m. Determine the ultimate driving resistance of the pile if it is fitted with a helmet, plastic dolly and 50

Verified Answer:

Hiley Formula Use Eq. (15.59)

Q_{u}=...

Question: 3.11

A 500 g sample of dry soil was used for a combined sieve and hydrometer analysis (152 H type hydrometer). The soil mass passing through the 75 μ sieve = 120 g. Hydrometer analysis was carried out on a mass of 40 g that passed through the 75 μ sieve. The average temperature recorded during the test

Verified Answer:

From Eq. (3.29)

L=16.3-0.1641 R[/lat...

Question: 14.2

A beam of length 4 m and width 0.75 m rests in dry medium dense sand. A plate load test carried out at the same site and at the same level gave a coefficient of subgrade reaction k1 equal to 47 MN/m^3. Determine the coefficient of subgrade reaction for the beam.

Verified Answer:

For sand the coefficient of subgrade reaction, [la...

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