Question

The coefficient ka of the active earth pressure is given by

Answer 1

The coefficient of lateral earth pressure, K, is defined as the ratio of the horizontal effective stress, σ’h, to the vertical effective stress, σ’v. The effective stress is the intergranular stress calculated by subtracting the pore pressure from the total stress as described in soil mechanics. K for a particular soil deposit is a function of the soil properties and the stress history. The minimum stable value of K is called the active earth pressure coefficient, Ka; the active earth pressure is obtained, for example,when a retaining wall moves away from the soil. The maximum stable value of K is called the passive earth pressure coefficient, Kp; the passive earth pressure would develop, for example against a vertical plow that is pushing soil horizontally. For a level ground deposit with zero lateral strain in the soil, the "at-rest" coefficient of lateral earth pressure, K0 is obtained....
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Answer 2

Answer:

Active earth pressure coefficient (Ka): It is the ratio of horizontal and vertical principal effective stresses when a retaining wall moves away (by a small amount) from the retained soil. K a = 1 − sin ⁡ ( ϕ ) 1 + sin ⁡ ( ϕ ) = tan 2 ( 45 − ϕ 2 ) .

Explanation:

The passive resistance is the place of the passive strain diagram, that is a triangle. If the space from the pinnacle of the front soil to the bottom of the shear key's H, then the strain at the bottom is Kp*γ*H, wherein γ is the soil density. Vertical distance of general lively earth stress above the bottom of the wall = y̅. For a triangular strain distribution, we know that y̅ = (H/3) above the bottom of the wall. The failure plane makes an angle of α = 45 + (ɸ/2) with the predominant important aircraft.

The coefficient of earth strain at rest is described because the ratio among the horizontal and vertical powerful stresses. for this reason, it is a parameter that expresses the natural state performing at the soil. figuring out such fee successfully have to, consequently, be a common practice in engineering.

The coefficient ka of the active earth pressure is given by

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The coefficient of active earth pressure is given by

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