tunnel design (7m)

Page 1 of 1 MWACHE DAM POWER PROJECT Detail of Diversion Tunnel - 7.0 m Diameter DATA Rated Discharge = 170.00 cumec No of Tunnels = 1 As per IS 9761:1995 Length of Tunnel 800 m Rated Discharge (Q) 170.00 cumec Discharge through each tunnel =(Q/No. of tun 170.00 cumec Velocity throug Tunnel (assumed) (V) 4.42 m/s Diametre of Tunnel (d)=Sqrt((Q*4)/(V*3.143) 7.00 m 7.00 m say Modified Horse - Shoe Tunnel AS Per IS 4480 (Part II)-1976 Radius of Hydraulically Equivalent Circle ( 3.500 m r =0.987580 R 3.457 m 3.457 = 38.872 1.728 Perimetre of Section =6.426334 r = 22.213 m 1.728 Hydraulic Radius = 0.506287 r = 1.750 m A = 0.780776 r = 2.699 m B = 1.561553 r = 5.398 m θ = = 2.70 5.185 5.185 Calculations for Drawing 1.5 r = 5.185 m 0.5 r = 1.728 m 0.3 r = 1.037 m 1.3 r = 4.49 m 5.40 Modified Horse - Shoe Tunnel Section MWACHE DAM POWER PROJECT Area of Section = 3.253572 r 2 m 2

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Page 1 of 1

MWACHE DAM POWER PROJECT

Detail of Diversion Tunnel - 7.0 m DiameterDATA

Rated Discharge = 170.00 cumecNo of Tunnels = 1As per IS 9761:1995Length of Tunnel 800 mRated Discharge (Q) 170.00 cumecDischarge through each tunnel =(Q/No. of tunnels) 170.00 cumecVelocity throug Tunnel (assumed) (V) 4.42 m/sDiametre of Tunnel (d)=Sqrt((Q*4)/(V*3.143)) 7.00 m 7.00 m say

Modified Horse - Shoe TunnelAS Per IS 4480 (Part II)-1976Radius of Hydraulically Equivalent Circle ( R ) = 3.500 m

r =0.987580 R 3.457 m 3.457

= 38.872 1.728Perimetre of Section =6.426334 r = 22.213 m 1.728Hydraulic Radius = 0.506287 r = 1.750 m

A = 0.780776 r = 2.699 mB = 1.561553 r = 5.398 mθ = = 2.70 5.185 5.185

Calculations for Drawing

1.5 r = 5.185 m0.5 r = 1.728 m0.3 r = 1.037 m1.3 r = 4.49 m

5.40

Modified Horse - Shoe Tunnel Section

MWACHE DAM POWER PROJECT

Area of Section = 3.253572 r2 m2

Design of Tunnel Support Systems

Structural design of tunnel lining