4. Clay layer A with single drainage and cocfficient of consolidation Cv taikes 6 months to achieve 50% consolidation. The time taken by clay layer B of the aume thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is A. 3 months B. 6 months C. 12 months D. 24months 5. Normally consolidated clay settled 10 mm when effective stress was increased fvom 100 kN/m2 to 200 kN/m'. If the effective stress is further increased fiom 200 kN/m to 400 kN/m2, then the settlement of the same clay is A. 10 mm B. 20 mm C. 30 mm D. 40 mm

4. Clay layer A with single drainage and cocfficient of consolidation Cv taikes 6 months to achieve 50% consolidation. The time taken by clay layer B of the aume thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is A. 3 months B. 6 months C. 12 months D. 24months 5. Normally consolidated clay settled 10 mm when effective stress was increased fvom 100 kN/m2 to 200 kN/m'. If the effective stress is further increased fiom 200 kN/m to 400 kN/m2, then the settlement of the same clay is A. 10 mm B. 20 mm C. 30 mm D. 40 mm

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

4. Clay layer A with single drainage and coefficient of consolidation Cv taikes 6 months
to achieve 50% consolidation. The time taken by clay layer B of the same thickness
with double drainage and coefficient of consolidation Cv/2 to achieve the same degree
of consolidation is
A. 3 months
B. 6 months
C. 12 months
D. 24months
5. Normally consolidated clay settled 10 mm when effective stress was imeresed fvom
100 kN/m' to 200 kN/m'. If the effective stress is further increased from 200 kN/m
to 400 kN/m2, then the settlement of the same clay is
A. 10 mm
B. 20 mm
C. 30 mm
D. 40 mm

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The figure below shows the soil profile at a site where you plan to lower the water table. You have results from two consolidation tests, one from the upper 12 ft thick overconsolidated crust, and another from the lower 40 ft thick normally consolidated zone. You plan to lower the water table from its current 12 ft depth to 25 ft below ground surface. The consolidation properties for each layer are shown. (Assume that changes in GWT do not affect γt of clay). a. Compute the σ′v in the middle of each layer before and after the water table is lowered b. Determine the total settlement that will result from lowering the water table
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Q-
13. Situation 13 - The soil is acted upon by a uniformly distributed load ΔP = 60 kPa at the ground surface. a. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. Round off to the nearest whole number. b. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the clay is normally consolidated. Round off to the nearest whole number. c. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. Round off to the nearest whole number.