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Books > Professional & Technical > Civil engineering, surveying & building > Structural engineering
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Prestressed Concrete-Lined Pressure Tunnels - Towards Improved Safety and Economical Design (Hardcover)
Loot Price: R4,870
Discovery Miles 48 700
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Prestressed Concrete-Lined Pressure Tunnels - Towards Improved Safety and Economical Design (Hardcover)
Series: IHE Delft PhD Thesis Series
Expected to ship within 12 - 17 working days
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Hydropower can be a source of sustainable energy, provided
environmental considerations are taken into account and economic
aspects of hydropower design are appropriately addressed. Using
concrete-lined pressure tunnels instead of steel pipes may be
economically attractive but may also have limitations due to the
low tensile strength of concrete. Cracking in concrete tunnel
linings can lead to loss of energy production, extensive repairs,
and even accidents. One of the techniques available to improve the
bearing capacity of pressure tunnels is through prestressing the
concrete lining by grouting the circumferential gap between the
concrete lining and the rock mass at high pressure. A classical
approach to determine the bearing capacity of such tunnels is based
on the theory of elasticity, assuming impervious concrete. In this
research, a new concept is introduced to assess the effect of
seepage on the bearing capacity of pressure tunnels. Also, an
innovative approach is proposed to explore the effects of the
in-situ stress ratio on the lining performance. Distinction is made
based on whether the rock mass behaves as an elasto-plastic
isotropic, or elastic anisotropic material. Furthermore, a
simplified method is introduced to quantify seepage associated with
cracks around the tunnel, which is useful for assessing tunnel
stability.
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