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Model investigation into the hydraulic performance of mattress protected slopes of low head hydraulic structures

Model investigation into the hydraulic performance of mattress protected slopes of low head hydraulic structures
Model investigation into the hydraulic performance of mattress protected slopes of low head hydraulic structures
The aim of this study was to provide some information about the
hydraulic performance of mattresses protecting slopes of low head
hydraulic structures. The flow resistance as well as stability of
slope were investigated.

The experimental programme was conducted in the Chilworth
Hydraulics Laboratory, Department of Civil Engineering. Two
models were constructed and tested. The inpermeable model (first)
had a slope of 1:7 (V;H) with mattress dimensions of 320x350mm
and a height of 40mm. The permeable model (second) was built with
the same slope except that the mattresses were protecting a sand
core.

The flow resistance of the mattresses was studied which included
Manning's roughness coefficient, Chezy's resistance factor and
Darcy-Weisbach friction factor. Velocity distribution above the
mattresses was evaluated and found well describing the flow.
The stability of the mattresses and their ability to resist
failure when exposed to higher discharges were also examined and
found stable under the discharges tried.

Detailed measurement of pressures were conducted in the permeable
model in order to study their effects on the stability of the
mattresses; such as; pressure distribution above the mattresses,
uplift pressures and seepage forces. Shear stresses due to
seepage forces were found very small and could be neglected.
Comparison with the results of smooth board simulating a
reinforced concrete structure, favours the mattresses as a means
to control erosion and dissipate energy efficiently.

Measures were suggested in terms of installation to reduce the
drag and uplift forces. A design procedure for a slope protected
by mattresses was set up and followed by a numerical example
implementing the results obtained in this study.

University of Southampton
Tahir, Taha
f3b09355-a32f-4b57-b563-18d1a29b43e3
Tahir, Taha
f3b09355-a32f-4b57-b563-18d1a29b43e3
Tosswell, Paul
cbb71d4e-701e-4750-8092-82e2c16843a4

Tahir, Taha (1993) Model investigation into the hydraulic performance of mattress protected slopes of low head hydraulic structures. University of Southampton, Doctoral Thesis, 253pp.

Record type: Thesis (Doctoral)

Abstract

The aim of this study was to provide some information about the
hydraulic performance of mattresses protecting slopes of low head
hydraulic structures. The flow resistance as well as stability of
slope were investigated.

The experimental programme was conducted in the Chilworth
Hydraulics Laboratory, Department of Civil Engineering. Two
models were constructed and tested. The inpermeable model (first)
had a slope of 1:7 (V;H) with mattress dimensions of 320x350mm
and a height of 40mm. The permeable model (second) was built with
the same slope except that the mattresses were protecting a sand
core.

The flow resistance of the mattresses was studied which included
Manning's roughness coefficient, Chezy's resistance factor and
Darcy-Weisbach friction factor. Velocity distribution above the
mattresses was evaluated and found well describing the flow.
The stability of the mattresses and their ability to resist
failure when exposed to higher discharges were also examined and
found stable under the discharges tried.

Detailed measurement of pressures were conducted in the permeable
model in order to study their effects on the stability of the
mattresses; such as; pressure distribution above the mattresses,
uplift pressures and seepage forces. Shear stresses due to
seepage forces were found very small and could be neglected.
Comparison with the results of smooth board simulating a
reinforced concrete structure, favours the mattresses as a means
to control erosion and dissipate energy efficiently.

Measures were suggested in terms of installation to reduce the
drag and uplift forces. A design procedure for a slope protected
by mattresses was set up and followed by a numerical example
implementing the results obtained in this study.

Text
93031284 - Version of Record
Available under License University of Southampton Thesis Licence.
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Published date: 1 January 1993

Identifiers

Local EPrints ID: 414081
URI: https://eprints.soton.ac.uk/id/eprint/414081
PURE UUID: e6f1a9a0-0cb1-42e8-8e05-cc4fd90e6a54

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Date deposited: 14 Sep 2017 16:31
Last modified: 13 Mar 2019 19:27

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