3. A soil layer consists of 4 meters of sand underlying 5 meters of clay. The water table is nat urally located at the rock bed under the soil strata but rose by 6 meters due to a recen storm. Further, capillary action is expected to develop due to the nature of the soil in ques tion. Compute the effective stresses at the end of expected capillary action, at the end o the water table, at the interface of the clay and sand and finally at the bottom of the so strata. Pertinent soil properties are as follows: Average S, Capil- lary Zone e D10 Clay 2.71 0.98 0.0125 25 40% Fi Sand 2.74 0.93 N.A. N.A. N.A.

3. A soil layer consists of 4 meters of sand underlying 5 meters of clay. The water table is nat urally located at the rock bed under the soil strata but rose by 6 meters due to a recen storm. Further, capillary action is expected to develop due to the nature of the soil in ques tion. Compute the effective stresses at the end of expected capillary action, at the end o the water table, at the interface of the clay and sand and finally at the bottom of the so strata. Pertinent soil properties are as follows: Average S, Capil- lary Zone e D10 Clay 2.71 0.98 0.0125 25 40% Fi Sand 2.74 0.93 N.A. N.A. N.A.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

3. A soil layer consists of 4 meters of sand underlying 5 meters of clay. The water table is nat-
urally located at the rock bed under the soil strata but rose by 6 meters due to a recent
storm. Further, capillary action is expected to develop due to the nature of the soil in ques-
tion. Compute the effective stresses at the end of expected capillary action, at the end of
the water table, at the interface of the clay and sand and finally at the bottom of the soil
strata. Pertinent soil properties are as follows:
Average S, Capil-
lary Zone
Gs
e
D10
Clay
2.71
0.98
0.0125
25
40%
Fig
Sand
2.74
0.93
N.A.
N.A.
N.A.

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ASAP PLS
2. The strength of soil is a. the total stress at failure b. the effective stress at failure c. the shear stress at failure d. e. the major principal stress at failure none of the above
Question 7 During the glacial period, the in situ stress of a clay formation was approximately 20,000 psf. Today, the in situ stress of that same clay is approximately 9500 psf. Which of the values below are most likely the OCR of the clay? O 1.65 O2.10 O 0.50 1.00
The layer is subjected to a uniform vertical stress increase of 100 kPa. The singly-drained clay layer has a coefficient of consolidation of 20 ft2 /yr. Determine the value of the excess pore pressure at point A 2 years after the application of the load. Also given is the chart giving the local degree of consolidation. a)4.4 kPa b)44 kPa c)88 kPa d)96 kPa
The water table in a deposit of uniform sand is located at 2m below the ground level. Assuming the soil above the water table be dry N and the void ratio is 0.75. The effective stress (in k- rounded off to nearest integer) at a depth of 5m below the ground level is N =9.81k-2 Take G = 2.65 and yw W m m 2'
4- A 22 ft clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 1,000 lb/f? to 3,000o 1b/ft?, the void ratio decreases from 0.9 to 0.75. The hydraulic conductivity, k, of the clay for the above loading range was found to be 2.4 x 10 in'sec. a) How long (in days) will it take for the clay layer to reach 50% consolidation? b) What is the settlement at that time (that is, at 50% consolidation)?
A 3m deep sand layer has a specific gravity of 2.68 and a void ratio of O.60. Under this layer is a 2.5m deep clay profile with a specific gravity of 2.7 and a moisture content of 30%. The water table is observed at 1m below the ground surface. Determine the effective soil pressure at the midweight of clay.