What is coefficient of active earth pressure?
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 ) .
What is lateral coefficient?
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.
What is coefficient of consolidation?
Coefficient of consolidation is the rate at which saturated soil undergoes consolidation. It can be only measured in laboratory. Time factor is given by T v = C v t d 2 . From this equation, the unit of coefficient of consolidation comes out to be cm2/sec.
What is lateral earth pressure in retaining wall?
When the wall moves away from the backfill due to active earth pressure, it actually moves towards the soil on the front side. The movement of the wall is resisted by the front soil and exerts a lateral pressure on the wall, in a direction opposite to that of active earth pressure, as shown in Fig. 15.2.
What is lateral pressure in civil engineering?
The pressure which acts in the horizontal direction of the soil is known as lateral pressure. It is an important factor that is considered in the design of the bridge abutment, retaining walls, basement, tunnels etc. It tries to consolidate the soil and reduce the bearing strength.
What is the literal coefficient of 3xy?
3x
In this case, the multiplicative factor associated with the variable y is 3x. Hence the coefficient of y in 3xy is 3x.
What is the unit of cv in soil mechanics?
Why is the coefficient of consolidation important?
Coefficient of consolidation (Cv) is a measure of compressibility of soil. This coefficient is an important parameter which is used in the design of foundation of civil engineering structures and also in the slope stability analysis.
What is lateral earth pressure?
Lateral Earth Pressure is the horizontal pressure applied by or to soil when it is against standing structures like basements (buildings) and retaining walls. The lateral earth pressure ( () at any depth is a factor (K) of the vertical effective stress () and cohesion (c):
What is the coefficient of active earth pressure?
When the retaining wall is moving away from the backfill the the ratio between lateral earth pressure and vertical earth pressure is called coefficient of active earth pressure. Ka = lateral pressure / vertical pressure Coefficient of passive earth pressure:
What is lateral soil pressure?
• Passive Earth Pressure Coefficient (Kp) The lateral earth pressure is equal to vertical earth pressure times the appropriate earth pressure coefficient. There are published relationships, tables and charts for calculating or selecting the appropriate earth pressure coefficient. Since soil backfill is typically granular material such as sand, silty sand, sand with
What is passive earth pressure?
Passive earth pressure. A state of passive earth pressure exists when the movement of the movement of the wall is such that the soil tends to compress horizontally. It is another extreme of the limiting equilibrium condition. In figure (b), the passive pressure develops on the left side of the wall below the ground level, as the soil in this zone is compressed when the movement of the wall is towards left. Earth pressure at rest