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Soil/geotextile filtration behavior under dynamic conditions of cyclic flow and vibration Hameiri, Avikam
Abstract
An evaluation of soil internal stability and soil/geotextile filtration compatibility for different types of loading conditions is important for the proper use and extension of empirically based design procedures. Static conditions like those found in earth dams and vertical drains, are characterized by steady flow. Dynamic conditions can, however, be present in some situations, for example under revetments due to hydraulic disturbance and under railways due to physical mechanical disturbance. To better understand the filtration performance of nonwoven geotextiles under dynamic conditions, this experimental study was undertaken. An existing permeation (Gradient Ratio) device was modified to perform tests with vibration. In addition, a new automatic cyclic Gradient Ratio device with a computerized control system was designed and commissioned to perform tests with cyclic flow. Forty-one combinations of four nonwoven geotextiles with narrow, wide, or gap-graded model soils were examined in testing. The reconstituted model soils were composed of glass bead fractions in the range between coarse silt and fine sand. The test program was conducted under a hydraulic gradient of four, and involved multi-stage tests. In the vibration tests, an initial stage of unidirectional flow was imposed and followed by a dynamic stage that involved physical disturbance using controlled energy blows at a frequency of 3 FIz. In cyclic flow tests the initial unidirectional flow was followed by reversing the direction of flow at frequencies of 0.2 Hz and 0.02 Hz, under both confined (av=25 kPa) and unconfined (ov=0 kPa) conditions. The results of each test were interpreted from the measurements of flow rate, water head distribution along the sample length, visual observations both during and after testing, and the weight and gradation of the particles that passed through the geotextile. Reflecting on existing design criteria and previous research work, the analysis and conclusions address issues of internal stability and soil geotextile compatibility under both static and dynamic conditions.
Item Metadata
Title |
Soil/geotextile filtration behavior under dynamic conditions of cyclic flow and vibration
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
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Description |
An evaluation of soil internal stability and soil/geotextile filtration compatibility for
different types of loading conditions is important for the proper use and extension of
empirically based design procedures. Static conditions like those found in earth dams and
vertical drains, are characterized by steady flow. Dynamic conditions can, however, be
present in some situations, for example under revetments due to hydraulic disturbance and
under railways due to physical mechanical disturbance. To better understand the filtration
performance of nonwoven geotextiles under dynamic conditions, this experimental study was
undertaken.
An existing permeation (Gradient Ratio) device was modified to perform tests with
vibration. In addition, a new automatic cyclic Gradient Ratio device with a computerized
control system was designed and commissioned to perform tests with cyclic flow. Forty-one
combinations of four nonwoven geotextiles with narrow, wide, or gap-graded model soils
were examined in testing. The reconstituted model soils were composed of glass bead
fractions in the range between coarse silt and fine sand.
The test program was conducted under a hydraulic gradient of four, and involved
multi-stage tests. In the vibration tests, an initial stage of unidirectional flow was imposed and
followed by a dynamic stage that involved physical disturbance using controlled energy blows
at a frequency of 3 FIz. In cyclic flow tests the initial unidirectional flow was followed by
reversing the direction of flow at frequencies of 0.2 Hz and 0.02 Hz, under both confined
(av=25 kPa) and unconfined (ov=0 kPa) conditions.
The results of each test were interpreted from the measurements of flow rate, water
head distribution along the sample length, visual observations both during and after testing,
and the weight and gradation of the particles that passed through the geotextile.
Reflecting on existing design criteria and previous research work, the analysis and
conclusions address issues of internal stability and soil geotextile compatibility under both
static and dynamic conditions.
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Extent |
12128167 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-28
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0063513
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2000-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.