# Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion

Discussion Forum : Soil Mechanics and Foundation Engineering - Section 1 (Q.No. 2)

2.

The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)

Discussion:

21 comments Page 1 of 3.
ViVEK said:
1 year ago

Ka = (1-sin¢)/(1+sin ¢)

= Cot^2 (Alpha) = Cot^2 (45+¢/2)

=Cot^2 [90-(45-¢/2)]

={Cot [90-(45-¢/2)]}^2

= {tan(45-¢/2)}^2

= tan^2 (45-¢/2)

Kp = (1+sinĀ¢) / (1-sin¢)

= tan^2 (Alpha) = tan^2 (45+¢/2)

=>In active earth pressure failure plane make angle of 45+¢/2 with horizontal .

=>In the Passive earth pressure, failure plane makes an angle of 45-¢/2 with horizontal.

=> Remember that angles are not indicated of Alpha.

In the above formulas, Alpha is the Critical Angle.

= Cot^2 (Alpha) = Cot^2 (45+¢/2)

=Cot^2 [90-(45-¢/2)]

={Cot [90-(45-¢/2)]}^2

= {tan(45-¢/2)}^2

= tan^2 (45-¢/2)

Kp = (1+sinĀ¢) / (1-sin¢)

= tan^2 (Alpha) = tan^2 (45+¢/2)

=>In active earth pressure failure plane make angle of 45+¢/2 with horizontal .

=>In the Passive earth pressure, failure plane makes an angle of 45-¢/2 with horizontal.

=> Remember that angles are not indicated of Alpha.

In the above formulas, Alpha is the Critical Angle.

(8)

Ravi said:
2 years ago

I think this term is also called flow value.

(1)

Joseph Nigus said:
2 years ago

The correct answer is option B.

Harsh Shah said:
3 years ago

What will be for passive earth pressure of soil? Please explain.

Manoj said:
3 years ago

According to me, Pa is proportional to cot^2(45+π/2).

Mahesh said:
5 years ago

How to calculate the angle? Please, anyone, tell me.

Staffana aishwarya said:
6 years ago

Soil at rest K0 = 1 - sinΠ.

Paul said:
6 years ago

What will be for soil at rest?

Sudipta said:
6 years ago

ka=1/tan^2(45°+Φ/2).

=tan^2(45°+Φ/2).

=flow value.

=tan^2(45°+Φ/2).

=flow value.

Akhil said:
7 years ago

Active earth pressure = 1/(tan2 (45° + π/2)) = tan2 (45° + π/2)

ka = 1/ kp.

ka = 1/ kp.

(2)

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