Following results were recorded from a consolidation test on a specimen of saturated clay, each load being maintained constant for 24 hours before the addition of the next increment. Applied stress (kN/m²) Sample thickness (mm) 0 19.70 50 100 200 19.30 19.15 18.85 The water content of the sample at the end of the test was 28 per cent and the specific gravity of the soil particles was 2.72.0 00% - 400 800 0 18.56 18.36 18.90 (a) Calculate the void ratio at the end of each stress range and plot the e- o curve. Compute the coefficient of volume compressibility, m, for an effective stress range of 150-350 kN/m² from the e- o curve. (b) Plot the e log o curve and determine the compression index, C and preconsolidation stress, (Casagrande method). (c) Plot the m curve. (d) Determine the consolidation settlement that may be expected in a 4 m thick layer of this clay for a stress increase from 150 to 350 kN/m², using data from (a), (b) and (c).

Following results were recorded from a consolidation test on a specimen of saturated clay, each load being maintained constant for 24 hours before the addition of the next increment. Applied stress (kN/m²) Sample thickness (mm) 0 19.70 50 100 200 19.30 19.15 18.85 The water content of the sample at the end of the test was 28 per cent and the specific gravity of the soil particles was 2.72.0 00% - 400 800 0 18.56 18.36 18.90 (a) Calculate the void ratio at the end of each stress range and plot the e- o curve. Compute the coefficient of volume compressibility, m, for an effective stress range of 150-350 kN/m² from the e- o curve. (b) Plot the e log o curve and determine the compression index, C and preconsolidation stress, (Casagrande method). (c) Plot the m curve. (d) Determine the consolidation settlement that may be expected in a 4 m thick layer of this clay for a stress increase from 150 to 350 kN/m², using data from (a), (b) and (c).

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

‹ample 9.1: Following results were recorded from a consolidation test on a specime turated clay, each load being maintained constant for 24 hours before the addition o ext increment.

Following results were recorded from a consolidation test on a specimen
of saturated clay, each load being maintained constant for 24 hours before the addition of
the next increment.
Applied stress (kN/m²)
Sample thickness (mm)
0
50
100 200
19.70 19.30 19.15 18.85
400 800
18.56 18.36
The water content of the sample at the end of the test was 28 per cent and the specific
gravity of the soil particles was 2.72.
004
008
-
0
18.90
(a) Calculate the void ratio at the end of each stress range and plot the e- o curve.
Compute the coefficient of volume compressibility, m, for an effective stress range of
150-350 kN/m² from the e-
curve.
(b) Plot the e log curve and determine the compression index, C and
preconsolidation stress, 5 (Casagrande method).
(c) Plot the m, - o curve.
(d) Determine the consolidation settlement that may be expected in a 4 m thick layer
of this clay for a stress increase from 150 to 350 kN/m², using data from (a), (b) and (c).

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