Drop structure lecture 3

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canal falls, types of canal fall, straight glacis fall, trepezoidal fall , khosla's theory, bligh's creep theory, impervious flloor length, uplift pressure

Ingenieurwesen

DROP STRUCTURE
DESIGN OF TREPEZOIDAL
CANAL FALL
3/19/2014 1
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 2
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

1. Crest wall :
As the discharge Q = 50 cumecs > 14
cumecs, a trapezoidal crest wall is
provided
Length of crest wall = d/s bed width
L = 35 m
Assume B = 1 to 1.5 m.3/19/2014 3
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

R.L. Of crest = u/s HFL – H
= 203.50 – 0.83 = 202. 67
Height of crest above d/s bed,
d = crest level - d/s bed level
= 202.67 – 200
= 2.67 m
3/19/2014 4
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

a trapezoidal crest wall with top
width 1.00 m, u/s slope 1 : 3 and d/s
1 : 8.
Base width B1 =
= 1 + (1/3) 2.67 + (1/8) 2.67
= 2.22 or say 2.5 m
3/19/2014 5
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

D = 2.67 M
1.0 M
(1/3)2.67
1.00 (1/8)2.67
3/19/2014 6
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Cistern design :
3/19/2014 7
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 8
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

D = 2.67 M
1.0 M
(1/3)2.67
1.00 (1/8)2.67
5.6 M
0.3 M
3/19/2014 9
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3. CUTOFF :
3/19/2014 10
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

D = 2.67 M
1.0 M
(1/3)2.67
1.00 (1/8)2.67
5.6 M
0.3 M
0.7 m
1.0 m
0.3 m to
0.6 m
0.3 m to
o.6 m
3/19/2014 11
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

4. Impervious floor :
Exit gradient,
3/19/2014 12
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

IF not given assume 1/5 to 1/7 .
3/19/2014 13
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 14
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

= b – ld – b1
3/19/2014 15
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

D = 2.67 M
1.0 M
(1/8)2.67
5.6 M
0.3 M
35.90 m
25.50 m
7.9 m
3/19/2014 16
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Thickness of floor
T = h / G – 1
Where h = residual head at any point
= Depth of cistern
+
(RL of crest – d/s bed level) uplift
pressure
Where uplift pressure =
3/19/2014 17
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at toe =
+ (distance from
d/s cutoff)
φc1
φe1
φd1
φe
φd
φc
φe
oorlengthoffl
ec  1
7.9 m
3/19/2014 18
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

All must be corrected before put in
equation
Corrections are thickness, mutual
interference of pile and slope where
slope correction is neglected.
φc1φe1 φd1
3/19/2014 19
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

U/S PILE INTERMIDIATE
PILE
DOWNSTREAM PILE
3/19/2014
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET
20

3/19/2014 21
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift Pressure Calculations :
(a) u/s cutoff wall
d1 = 0.70 m, b = 35.90 m
b = • d1
3/19/2014 22
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 23
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 24
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Corrections for interference of
d/s pile
3/19/2014 25
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 26
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 27
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 28
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014 29
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at toe =
+ (distance from
d/s cutoff)
φc1
φe1
φd1
φe
φd
φc
φe
oorlengthoffl
ec  1
7.9 m
3/19/2014 30
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at toe =
+ (7.9)
φc1
φe1
φd1
φe
φd
φc
12.15
90.35
15,1273.89 
7.9 m
3/19/2014 31
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Thickness of floor
Where h = residual head at any point
= 0.3 + (2.70) 0.29= 1.08
T = h / G – 1 = 1.08/2.24 – 1
= 0.87 say 0.90
3/19/2014 33
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at 3 m
from toe =
+ (4.9)
φc1
φe1
φd1
φe
φd
φc
T
=
h
/
G
–
1
12.15
90.35
15,1273.89 
4.9 m
3/19/2014 34
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET
T
=
h
/
1

Thickness of floor
Where h = residual head at any point
= 0.3+ (2.7) 0.227 =0.913
T = h / G – 1 = 0.913/ 1.24
= 0.73 say 0.80
3/19/2014 35
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at 5.6 m =
+ (5.6)
φc1
φe1
φd1
φe
φd
φc
12.15
90.35
15,1273.89 
2.3 m
3/19/2014 36
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Thickness of floor
Where h = residual head at any point
= 0.3+ (2.7) 0.17 =0.76
T = h / G – 1
= 0.76/ 1.24
= 0.61 say 0.70
3/19/2014 37
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Uplift pressure = at end of
floor =
φc1
φe1
φd1
φe
φd
φc
12.15
3/19/2014 38
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

Thickness of floor
Where h = residual head at any point
= 0.3+ (2.7) 0.1215 =0.328
T = h / G – 1
= 0.328/ 1.24
= 0.26 say 0.40
3/19/2014 39
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET

3/19/2014
PREPARED BY VIDHI H. KHOKHANI
ASSISTANT PROFESSOR, DIET
40

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Drop structure lecture 3

1. DROP STRUCTURE DESIGN OF TREPEZOIDAL CANAL FALL 3/19/2014 1 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

2. 3/19/2014 2 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

3. 1. Crest wall : As the discharge Q = 50 cumecs > 14 cumecs, a trapezoidal crest wall is provided Length of crest wall = d/s bed width L = 35 m Assume B = 1 to 1.5 m.3/19/2014 3 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

4. R.L. Of crest = u/s HFL – H = 203.50 – 0.83 = 202. 67 Height of crest above d/s bed, d = crest level - d/s bed level = 202.67 – 200 = 2.67 m 3/19/2014 4 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

5. a trapezoidal crest wall with top width 1.00 m, u/s slope 1 : 3 and d/s 1 : 8. Base width B1 = = 1 + (1/3) 2.67 + (1/8) 2.67 = 2.22 or say 2.5 m 3/19/2014 5 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

6. D = 2.67 M 1.0 M (1/3)2.67 1.00 (1/8)2.67 3/19/2014 6 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

7. Cistern design : 3/19/2014 7 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

8. 3/19/2014 8 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

9. D = 2.67 M 1.0 M (1/3)2.67 1.00 (1/8)2.67 5.6 M 0.3 M 3/19/2014 9 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

10. 3. CUTOFF : 3/19/2014 10 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

11. D = 2.67 M 1.0 M (1/3)2.67 1.00 (1/8)2.67 5.6 M 0.3 M 0.7 m 1.0 m 0.3 m to 0.6 m 0.3 m to o.6 m 3/19/2014 11 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

12. 4. Impervious floor : Exit gradient, 3/19/2014 12 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

13. IF not given assume 1/5 to 1/7 . 3/19/2014 13 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

14. 3/19/2014 14 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

15. = b – ld – b1 3/19/2014 15 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

16. D = 2.67 M 1.0 M (1/8)2.67 5.6 M 0.3 M 35.90 m 25.50 m 7.9 m 3/19/2014 16 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

17. Thickness of floor T = h / G – 1 Where h = residual head at any point = Depth of cistern + (RL of crest – d/s bed level) uplift pressure Where uplift pressure = 3/19/2014 17 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

18. Uplift pressure = at toe = + (distance from d/s cutoff) φc1 φe1 φd1 φe φd φc φe oorlengthoffl ec  1 7.9 m 3/19/2014 18 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

19. All must be corrected before put in equation Corrections are thickness, mutual interference of pile and slope where slope correction is neglected. φc1φe1 φd1 3/19/2014 19 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

20. U/S PILE INTERMIDIATE PILE DOWNSTREAM PILE 3/19/2014 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET 20

21. 3/19/2014 21 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

22. Uplift Pressure Calculations : (a) u/s cutoff wall d1 = 0.70 m, b = 35.90 m b = • d1 3/19/2014 22 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

23. 3/19/2014 23 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

24. 3/19/2014 24 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

25. Corrections for interference of d/s pile 3/19/2014 25 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

26. 3/19/2014 26 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

27. 3/19/2014 27 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

28. 3/19/2014 28 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

29. 3/19/2014 29 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

30. Uplift pressure = at toe = + (distance from d/s cutoff) φc1 φe1 φd1 φe φd φc φe oorlengthoffl ec  1 7.9 m 3/19/2014 30 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

31. Uplift pressure = at toe = + (7.9) φc1 φe1 φd1 φe φd φc 12.15 90.35 15,1273.89  7.9 m 3/19/2014 31 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

32. Thickness of floor T = h / G – 1 Where h = residual head at any point = Depth of cistern + (RL of crest – d/s bed level) uplift pressure Where uplift pressure = 3/19/2014 32 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

33. Thickness of floor Where h = residual head at any point = 0.3 + (2.70) 0.29= 1.08 T = h / G – 1 = 1.08/2.24 – 1 = 0.87 say 0.90 3/19/2014 33 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

34. Uplift pressure = at 3 m from toe = + (4.9) φc1 φe1 φd1 φe φd φc T = h / G – 1 12.15 90.35 15,1273.89  4.9 m 3/19/2014 34 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET T = h / 1

35. Thickness of floor Where h = residual head at any point = 0.3+ (2.7) 0.227 =0.913 T = h / G – 1 = 0.913/ 1.24 = 0.73 say 0.80 3/19/2014 35 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

36. Uplift pressure = at 5.6 m = + (5.6) φc1 φe1 φd1 φe φd φc 12.15 90.35 15,1273.89  2.3 m 3/19/2014 36 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

37. Thickness of floor Where h = residual head at any point = 0.3+ (2.7) 0.17 =0.76 T = h / G – 1 = 0.76/ 1.24 = 0.61 say 0.70 3/19/2014 37 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

38. Uplift pressure = at end of floor = φc1 φe1 φd1 φe φd φc 12.15 3/19/2014 38 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

39. Thickness of floor Where h = residual head at any point = 0.3+ (2.7) 0.1215 =0.328 T = h / G – 1 = 0.328/ 1.24 = 0.26 say 0.40 3/19/2014 39 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET

40. 3/19/2014 PREPARED BY VIDHI H. KHOKHANI ASSISTANT PROFESSOR, DIET 40

Drop structure lecture 3

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Drop structure lecture 3