Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion
Discussion Forum : Soil Mechanics and Foundation Engineering - Section 5 (Q.No. 24)
24.
The intensity of active earth pressure at a depth of 10 metres in dry cohesionless sand with an angle of internal friction of 30° and with a weight of 1.8 t/m3, is
Discussion:
7 comments Page 1 of 1.
UJWAL said:
1 decade ago
Intensity of pressure at base = Ka.Y.H.
Michael L Rokhum said:
1 decade ago
$ = 30deg.
k = (1-sin$) / (1+sin$).
k = 0.3333333.
y = 1.8.
h = 10.
I/p = YH.
I/p = 0.3333333*1.8*10 = 5.999999~6.
k = (1-sin$) / (1+sin$).
k = 0.3333333.
y = 1.8.
h = 10.
I/p = YH.
I/p = 0.3333333*1.8*10 = 5.999999~6.
Abhay said:
10 years ago
The intensity of active earth pressure at H= 10 m is given by the formula,
Pa = KaYH.
The angle of friction is used to calculate coeff.of active earth pressure,
Ka = (1-sinφ)/(1+sinφ) = (1-sin30)/(1+sin30) = 0.3333333.
Y = 1.8 t/m3.
H = 10m.
Pa = 0.333333*1.8*10 = 6 t/m2.
Pa = KaYH.
The angle of friction is used to calculate coeff.of active earth pressure,
Ka = (1-sinφ)/(1+sinφ) = (1-sin30)/(1+sin30) = 0.3333333.
Y = 1.8 t/m3.
H = 10m.
Pa = 0.333333*1.8*10 = 6 t/m2.
(1)
Dham said:
10 years ago
Pa = 0.5 wh^k.
(1)
Raj said:
8 years ago
Why, shouldn't use Wh^2/2 *1-sinθ/1+sinθ?
Amjad Ali said:
6 years ago
@Raj In question, it's asking about the intensity of pressure, not about total pressure that's why pa=ka.Y.H.
Muhammad Junaid Michaelson said:
5 years ago
The Pressure intensity at any depth "h" is;
P = Ka*Y*h --------> (1)
Ka = (1-sinφ)/(1+sinφ), φ = 30° & sin(30°) = 1/2
Ka = (1-1/2)/(1+1/2) = (1/2)/(3/2) = 1/3.
Ka = 1/3.
Y = 1.8 t/m3 & h = 10 m.
Put all these into equation (1).
So, (1) =>
P = (1/3)*1.8*10,
P = 0.6 * 10,
P = 6 t/m2.
So, [C] is Correct Option.
P = Ka*Y*h --------> (1)
Ka = (1-sinφ)/(1+sinφ), φ = 30° & sin(30°) = 1/2
Ka = (1-1/2)/(1+1/2) = (1/2)/(3/2) = 1/3.
Ka = 1/3.
Y = 1.8 t/m3 & h = 10 m.
Put all these into equation (1).
So, (1) =>
P = (1/3)*1.8*10,
P = 0.6 * 10,
P = 6 t/m2.
So, [C] is Correct Option.
(4)
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