The ratio of horizontal stress σh to vertical stress σv is...
To vertical stress in a material is known as the coefficient of lateral earth pressure. This ratio can vary depending on the type of material and the specific conditions, such as the density and moisture content of the soil. In general, the coefficient of lateral earth pressure is denoted by the symbol K and can range from 0 to 1. The value of K represents the relative magnitude of the horizontal stress compared to the vertical stress.
For example, if the coefficient of lateral earth pressure is 0.5, it means that the horizontal stress is half the magnitude of the vertical stress. This indicates that the material is relatively more compressible in the horizontal direction compared to the vertical direction.
Conversely, if the coefficient of lateral earth pressure is 1, it means that the horizontal stress is equal to the vertical stress. This indicates that the material is equally compressible in both the horizontal and vertical directions.
The coefficient of lateral earth pressure is an important parameter in geotechnical engineering and is used in various calculations and analyses, such as the design of retaining walls, slope stability analysis, and foundation design.
The ratio of horizontal stress σh to vertical stress σv is...
Coefficient of Earth pressure:
It is the ratio of horizontal effective stress σh and vertical effective vertical stress σv
Earth pressure at rest:
- It is the ratio of horizontal and vertical effective vertical stress when the retaining wall does not move at all.
- Sometimes it is also referred to as neural lateral earth pressure or lateral earth pressure
- Ko = 1−sinϕ
The coefficient of earth pressure at rest (K
0) is given by,
σ
h – Effective horizontal stress
σ
v – Effective vertical stress
Active earth pressure:
- It is the ratio of horizontal to vertical stress when the retaining wall moves away from the retained soil.
Passive earth pressure:
- It is defined as the ratio of horizontal to vertical stress when the retaining wall moves towards the retaining wall.