Calculation of the lining of a non-circular tunnel

Journal Article · Thu Dec 01 04:00:00 EST 1983 · Hydrotech. Constr.; (United States)

DOI:https://doi.org/10.1007/BF01427528· OSTI ID:5051605

Ilyushin, V F

High-head hydroelectric stations located in mountainous regions have underground structures on which one of the main loads is the pressure of groundwaters. The most common noncircular cross-sectional shape of a tunnel is the horseshoe with a crown outlined over the arc of a circle and flat walls and invert. Such a shape is the most technologically efficient during construction. The lining has usually a minimum design thickness and can be concrete or reinforced. The reinforcement is installed in the crown in conformity with the diagram of moments and in the walls and invert in the middle of the lining thickness. The lining is equipped with drainage reducing the pressure of the groundwaters to a practically acceptable value. Residual pressure is absorbed by the lining of the crown having an efficient axis outlined over the arc of a circle and by the flat walls and invert transmitting forces through the anchors to the surrounding rock mass. There are no restrictions with respect to the conditions of hydraulics and seepage with respect to cavitation erosion and abrasion, and permissible gradients of the seepage flow through the lining. Methods are given for calculating the crown, concrete wall and invert, anchors, and concrete-rock walls and invert. 4 references, 2 figures.

• OSTI ID: 5051605
• Journal Information: Hydrotech. Constr.; (United States), Journal Name: Hydrotech. Constr.; (United States) Vol. 17; ISSN HYCOA
• Country of Publication: United States
• Language: English

Related Subjects

13 HYDRO ENERGY
130700* -- Hydro Energy-- Power-Conversion Systems
CONSTRUCTION
DESIGN
GROUND WATER
HIGH-HEAD HYDROELECTRIC POWER PLANTS
HYDROELECTRIC POWER PLANTS
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
POWER PLANTS
TUNNELS
UNDERGROUND FACILITIES
WATER