Irrigation Engineering Continution Part 1

8/14/2019 Irrigation Engineering Continution Part 1

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Muhammad Farooq Zia (2005-CE-44)

Compiled

DESIGN OF SUB-STRUCTURE OF BARRAGE

ASSIGNMENT

QUESTION:

a. Check the stability of structure against piping. Foundation materials are fine sand, coarse sand & sand + gravel. b. Calculate the uplift pressure at the point of application and thickness of floor. Points are A, B, C, D, E, F, G, H, I, J & K.

specific gravity of material, =2.24specific weight of water, =1 tonsm3

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Solution:We know that according to Blighs theory our structure will be safe against piping if,

HL 1C

BLIGHS CREEP THEORY (CHECK AGAINST PIPING)

SOILTYPE

BLIGHSCOEFFICIENT

C

ROLLNO.

HEAD H

Roll No.100

(m)

TOTALCREEP

LENGTH'L'

(m)

HL 1C HL1C

FINESAND 15 38 0.38 11.42 0.03 0.07 SAFE

COARSESAND 12 38 0.38 11.42 0.03 0.08 SAFE

SAND +GRAVEL 9 38 0.38 11.42 0.03 0.11 SAFE

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BLIGHS CREEP THEORY (UPLIFT PRESSURE AT PARTICULAR POINT)POINTS ROLL

NO.LENGTH UP

TO THATPOINT

Lpt=S+ x1+(m)

TOTAL CREEPLENGTHL=S+2x1

+ 2x2+2x3 m

h'= H 1- LptL

(m)

(specific wt. of

water)

(tons/m 3)

(specificgravity

of concrete

)

UPLIFTPRESSURE

h'

(tons/m 2)

t=4h'3+1

(m)

A 38 0.00 11.42 0.38 1 2.24 0.38 0.20

B 38 2.50 11.42 0.30 1 2.24 0.30 0.15

C 38 2.98 11.42 0.28 1 2.24 0.28 0.15

D 38 3.45 11.42 0.27 1 2.24 0.27 0.14

E 38 3.93 11.42 0.25 1 2.24 0.25 0.13

F 38 4.35 11.42 0.24 1 2.24 0.24 0.12

G 38 4.77 11.42 0.22 1 2.24 0.22 0.11

H 38 5.40 11.42 0.20 1 2.24 0.20 0.10

I 38 5.91 11.42 0.18 1 2.24 0.18 0.10

J 38 6.42 11.42 0.17 1 2.24 0.17 0.09

K 38 11.42 11.42 0.00 1 2.24 0.00 0.00

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LANES WEIGHTED CREEP THEORY (CHECK AGAINST PIPING)

SOILTYPE

LANESSCOEFFICIENT

C

ROLLNO.

HEAD H

Roll No.100

(m)

TOTALCREEP

LENGTH'L'

(m)

HL 1C HL1C

FINESAND 7 38 0.38 12.82 0.03 0.14 SAFE

COARSE

SAND 5 38 0.38 12.82 0.03 0.20 SAFESAND +GRAVEL 4 38 0.38 12.82 0.03 0.25 SAFE

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LANES WEIGHTED CREEP THEORY (UPLIFT PRESSURE AT PARTICULAR POINT)POINT

SROLL

NO.LENGTH UP

TO THATPOINT

Lpt=S+ x1+(m)

TOTAL CREEPLENGTH

L=S+3x1+3x2+3x3 m

h'= H 1- LptL

(m)

(specific wt. of

water)

(tons/m 3)

(specificgravity

of concrete

)

UPLIFTPRESSURE

h'

(tons/m 2)

t=4h'3+1

(m)

A 38 0.00 12.82 0.38 1 2.24 0.38 0.20

B 38 2.50 12.82 0.31 1 2.24 0.31 0.16

C 38 3.21 12.82 0.28 1 2.24 0.28 0.15

D 38 3.93 12.82 0.26 1 2.24 0.26 0.14

E 38 4.40 12.82 0.25 1 2.24 0.25 0.13

F 38 5.03 12.82 0.23 1 2.24 0.23 0.12

G 38 5.67 12.82 0.21 1 2.24 0.21 0.11

H 38 6.30 12.82 0.19 1 2.24 0.19 0.10

I 38 7.06 12.82 0.17 1 2.24 0.17 0.09

J 38 7.82 12.82 0.15 1 2.24 0.15 0.08

K 38 12.82 12.82 0.00 1 2.24 0.00 0.00

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Irrigation Engineering Continution Part 1

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