Question

the coefficient of laterial earth pressure at rest ko can be used to convert effective vertical stress to effective horizontal stress.

true or false

Answer 1

=>

Answer is true.

Ratio of the horizontal stress to vertical stress is known as Koefficient of earth pressure.

K'o = coefficient of earth pressure at rest in terms of effective stresses

σv = vertical stress

σH = horizontal stress

ρd = density of the soil

σv = ρd g z

σH = K'o σv = K'o ρd g z

or σv = σH / K'o

Now,

Coefficient of earth pressure at rest is defined in terms of effective stresse.

σ'v = effective vertical stress

σ'H = effective horizontal stress

σ'H = K'o σ'v

or, σ'v= σ'H / K'o ,

where, σ'v = σv - u = σv - w z

So, We used K'o for convert effective vertical stress to effective horizontal stress.