Q1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick wastested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the timewith dial gauge readings are:Time (min)0Settlement (mm) 00.25 10.22 0.42490.6 0.71160.7936641000.86 0.91 1.04d1- Find Coefficient of consolidation in cm²/s using root time and TV90% = 0.848.Scanned by TapScanner

We are given Tv90% = 0.848 Where 90% represent Degree of consolidation U = 90% We know that Degree…

Answered: Q1/ specimen of the fine-grained soil,…

Q1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick was tested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the time with dial gauge readings are:

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.14P

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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

Q1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick was
tested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the time
with dial gauge readings are:
Time (min)
0
Settlement (mm) 0
0.25 1
0.22 0.42
4
9
0.6 0.71
16
0.79
36
64
100
0.86 0.91 1.04
d
1- Find Coefficient of consolidation in cm²/s using root time and TV90% = 0.848.
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Step 1: Calculation of time for 90 degree consolidation

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Q1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick was tested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the time with dial gauge readings are: Time (min) 0 Settlement (mm) 0 0.25 1 0.22 0.42 Vertical pressure (kPa) 15 Settlement (mm) 0.1 Void ratio 1.88 4 0.6 30 0.11 1.87 9 0.71 16 0.79 And the void ratio and settlement for each load increment is shown in the table below. 60 0.21 1.85 120 1.13 1.72 100 1.04 36 64 0.91 0.86 240 2.17 1.57 480 3.15 1.43 1- Find Coefficient of consolidation in cm²/s using root time and TV90% = 0.848. 2- Find Preconsolidation pressure (oc) and compression index (Cc). Scanned by TapScanner
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