2. Data from an oedometer test (consolidation test), which was conducted on a clay sample collected from a site wherea building is proposed, are given below.(a) Calculate the change in void ratios (Ae), and the void ratios (e), filling the table given below.(b) Plot e-log curve and determine C. (compression index), C, (swell index), and o'e (pre-consolidationpressure).Given: Initial sample thickness, Ho 20 mm, G,- 2.65, dry mass of specimen after the test,Ms= 120 g, diameter of the specimen, D= 70 mm.Stress (o')(kPa)AH (mm)H (mm)H, (mm)Ae240.021480.0250.050961920.2033840.6867681.23815361.7783841.638961.457241.3070.750.700.650.600.55Void Ratio CVLE351 Soil MechanicsLaboratory Assignment 2 (due 30 December 2021)1. DIRECT SHEAR TEST (DST)(a) Explain the test procedure briefly and sketch the test set up.(b) The following readings were taken in two sets of tests (under normal load N= 390 Nand N2= 750 N) using a shear box of 60 mm x 60 mm in cross-sectional areacontaining a specimen of dry sand:i. Plot the vertical displacement against the horizontal displacementii. Plot the shearing resistance against hprizontal displacementiii. Determine the peak (o'peak) and critical state (o'er) angle of internal frictions.iv. Explain what is dilatancy and determine the angle of dilation (w) in both tests.TEST 1NormalLoadP 390 NHorizontalT (kN)t (kPa)Vertical displacementdisplacement(mm)0.(mm)0.1615-0.0302.0.258-0.02030.2910.1404.0.2760.3485.0.2390.4376.0.2325TEST 20.462NormalLoad

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2. Data from an oedometer test (consolidation test), which was conducted on a clay sample collected from a site where a building is proposed, are given below. (a) Calculate the change in void ratios (Ae), and the void ratios (e), filling the table given below. (b) Plot e-log curve and determine C. (compression index), C, (swell index), and o'e (pre-consolidation pressure). Given: Initial sample thickness, Ho 20 mm, G,= 2.65, dry mass of specimen after the test, Ms= 120 g, diameter of the specimen, D= 70 mm. Stress (o') (kPa) AH (mm) H (mm) H, (mm) Ae 24 0.021 48 0.025 96 0.050 192 0.203 384 0.686 768 1.238 1536 1.778 384 1.638 96 1.457 24 1.307 0.75 0.70 0.65 0.60 0.55 Void Ratio

2. Data from an oedometer test (consolidation test), which was conducted on a clay sample collected from a site where a building is proposed, are given below. (a) Calculate the change in void ratios (Ae), and the void ratios (e), filling the table given below. (b) Plot e-log curve and determine C. (compression index), C, (swell index), and o'e (pre-consolidation pressure). Given: Initial sample thickness, Ho 20 mm, G,= 2.65, dry mass of specimen after the test, Ms= 120 g, diameter of the specimen, D= 70 mm. Stress (o') (kPa) AH (mm) H (mm) H, (mm) Ae 24 0.021 48 0.025 96 0.050 192 0.203 384 0.686 768 1.238 1536 1.778 384 1.638 96 1.457 24 1.307 0.75 0.70 0.65 0.60 0.55 Void Ratio

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

2. Data from an oedometer test (consolidation test), which was conducted on a clay sample collected from a site where
a building is proposed, are given below.
(a) Calculate the change in void ratios (Ae), and the void ratios (e), filling the table given below.
(b) Plot e-log curve and determine C. (compression index), C, (swell index), and o'e (pre-consolidation
pressure).
Given: Initial sample thickness, Ho 20 mm, G,- 2.65, dry mass of specimen after the test,
Ms= 120 g, diameter of the specimen, D= 70 mm.
Stress (o')
(kPa)
AH (mm)
H (mm)
H, (mm)
Ae
24
0.021
48
0.025
0.050
96
192
0.203
384
0.686
768
1.238
1536
1.778
384
1.638
96
1.457
24
1.307
0.75
0.70
0.65
0.60
0.55
Void Ratio

CVLE351 Soil Mechanics
Laboratory Assignment 2 (due 30 December 2021)
1. DIRECT SHEAR TEST (DST)
(a) Explain the test procedure briefly and sketch the test set up.
(b) The following readings were taken in two sets of tests (under normal load N= 390 N
and N2= 750 N) using a shear box of 60 mm x 60 mm in cross-sectional area
containing a specimen of dry sand:
i. Plot the vertical displacement against the horizontal displacement
ii. Plot the shearing resistance against hprizontal displacement
iii. Determine the peak (o'peak) and critical state (o'er) angle of internal frictions.
iv. Explain what is dilatancy and determine the angle of dilation (w) in both tests.
TEST 1
Normal
Load
P 390 N
Horizontal
T (kN)
t (kPa)
Vertical displacement
displacement
(mm)
0.
(mm)
0.1615
-0.030
2.
0.258
-0.020
3
0.291
0.140
4.
0.276
0.348
5.
0.239
0.437
6.
0.2325
TEST 2
0.462
Normal
Load

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|!;9 ELABORATE Try solving the following problem: Practice Problem: The following are the results of a consolidation test on a sample soil: a. Plot the e-log o' curve b. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, Cc e 1.1 1.085 1.055 1.01 0.94 0.79 0.63 Pressure, o' (ton /ft²) 0.25 0.50 1.00 2.00 4.00 8.00 16.00
8.2
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