A cylindrical water tank weighing 1,000,000 N with a diameter of 3.5 m is expected to be placed on a 5 m thick clay layer that is fully saturated. Unit weights of the saturated clay layer and water are 19.4 and 9.81 KN/m3 respectively. Consolidation tests performed from sample taken from midpoint of the layer was found to have the properties shown in table 2. Table 2 Preconsolidation Сс Cr eo Stress (kPa) 40 0.26 0.05 0.44 a. What is the ultimate settlement expected in the clay layer due to the water tank? b. If 99 mm of settlements were observed after one year of placing the tank, what is the Cv of the clay layer? Assume clay is singly drained.

A cylindrical water tank weighing 1,000,000 N with a diameter of 3.5 m is expected to be placed on a 5 m thick clay layer that is fully saturated. Unit weights of the saturated clay layer and water are 19.4 and 9.81 KN/m3 respectively. Consolidation tests performed from sample taken from midpoint of the layer was found to have the properties shown in table 2. Table 2 Preconsolidation Сс Cr eo Stress (kPa) 40 0.26 0.05 0.44 a. What is the ultimate settlement expected in the clay layer due to the water tank? b. If 99 mm of settlements were observed after one year of placing the tank, what is the Cv of the clay layer? Assume clay is singly drained.

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

A cylindrical water tank weighing 1,000,000 N with a diameter of 3.5 m is expected to be placed on a 5 m thick
clay layer that is fully saturated. Unit weights of the saturated clay layer and water are 19.4 and 9.81 KN/m
respectively. Consolidation tests performed from sample taken from midpoint of the layer was found to have
the properties shown in table 2.
Table 2
Preconsolidation
Stress (kPa)
Co
Cr
eo
17
40
0.26
0.05
0.44
a. What is the ultimate settlement expected in the clay layer due to the water tank?
b. If 99 mm of settlements were observed after one year of placing the tank, what is the Cv of
the clay layer? Assume clay is singly drained.

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