Q3 - Lateral Pressure And Retaining Walls

Question 1

How to calculate the resultant force or lateral pressure distribution with two layers?

Answer 1

First find Ka1 and Ka2
Now find SIGMA.x = Ka * Gamma * H (remember second layer gags - another card)
Pressure1,2,3 = area * SIGMA.x
Position x = (Total: (P * height of centroid for each one))/Ptotal

Question 2

How to calculate the water SIGMA.x and pressure?

Answer 2

SIGMA.x = H* GAMMA.w
P = Area * SIGMA.x

Question 3

What to remember when calculating SIGMA.x for multilayer remaining wall?

Answer 3

H1 * GAMMA.1 * k1, then:
H1 * GAMMA.1 * k2!!
H2 * GAMMA.2 * k2 + last one

Question 4

What to remember for P when looking at a multilayered retaining wall?

Answer 4

When you get to the last SIGMA.x, minus the square bit!