The lab apparatus shown in the figure maintains a constant head in both the upper and lower reservoirs. The soil sample is a silty sand, placed in a 200mm diameter container, having a specific gravity of 2.70 with a hydraulic conductivity k-0.1945 cm/sec. The moisture content of soil is 18.5% and the degree of saturation is 100%. The relationship between the specific gravity. moisture content, degree of saturation, and void ratio is given below: SGw- Se The level of water from the datum in the inlet and outlet portion is 46Omm and 240mm respectively. Calculate for the discharge of water in cublc cm per sec if distance d is 10Omm and distance Lis 220mm NLET OUTLET Sed Sample DATUM

The lab apparatus shown in the figure maintains a constant head in both the upper and lower reservoirs. The soil sample is a silty sand, placed in a 200mm diameter container, having a specific gravity of 2.70 with a hydraulic conductivity k-0.1945 cm/sec. The moisture content of soil is 18.5% and the degree of saturation is 100%. The relationship between the specific gravity. moisture content, degree of saturation, and void ratio is given below: SGw- Se The level of water from the datum in the inlet and outlet portion is 46Omm and 240mm respectively. Calculate for the discharge of water in cublc cm per sec if distance d is 10Omm and distance Lis 220mm NLET OUTLET Sed Sample DATUM

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

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

The lab apparatus shown in the figure maintains a constant head in both the
upper and lower reservoirs. The soil sample is a silty sand, placed in a 200mm
diameter container, having a specific gravity of 2.70 with a hydraulic
conductivity k-0.1945 cm/sec. The moisture content of soil is 18.5% and the
degree of saturation is 100%. The relationship between the specific gravity.
moisture content, degree of saturation, and void ratio is given below:
SGw- Se
The level of water from the datum in the inlet and outlet portion is 460mm
and 240mm respectively. Calculate for the discharge of wwater in cubic cm per
sec if distance d is 100mm and distance Lis 220mm
NLET
OUTLET
of
red water
DATUM
Sol Sample

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A fine sand was tested in situ to give a coefficient of permeability of 3.7 x107 m/s. A sample of the same sand, 400mm high and 100 mm in diameter was then tested in a constant head permeameter. Water percolated through the soil under a head of 600mm for 5 minutes and the discharge water had a volume of 1300mm. Determine whether the in situ testing was reflected by the laboratory results and If the below water retaining structure is 140m in width, based on a coefficient of permeability of 7.8x10°m/s, determine the quantity of water that will flow through the soil and under the structure per day.
The hydraulic conductivity of a soil sample (3.4 x 10-4 cm/s) has been determined via a permeability test. The water temperature was 28°C at the time of experiment. What is the hydraulic conductivity of the sample at the standard temperature of 20°C?
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