Kp in retaining walls

[Anonymous]

hi friends 

i have two questions about retaining walls

first : how add Kp soil ( front soil pressure ) ? pic1

second : what is the value of this  (K ) s , and how ,when we use them ? pic2

[Muhammed.OPERA · Accepted solution]

Hi @Anonymous

• Active pressure is pressure caused by soil, when a retaining element has been displaced because of the action of external forces by a value which is at least equal to the limit value ra in the direction compatible to the pressure caused by soil. This pressure equals the hydrostatic pressure multiplied by the coefficient Ka: Pa(z) = Ka * P(z), 

• Passive pressure is pressure caused by soil, when a retaining element has been displaced because of the action of external forces by a value which is at least equal to the limit value ρp in the direction opposite to the pressure caused by soil. This pressure equals the hydrostatic pressure multiplied by the coefficient Kp: Pp(z) = Kp * P(z), 

• Intermediate pressures occur if the displacement of the retaining element is contained in the interval ρa < ρ < ρp and ρ≠0. It is a combination of static pressure and active or passive pressure:

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

In addition to the post made by @Muhammed.OPERA (thank you for your help) you can decide on the direction of the load (front or back pressure) in this way:

For Ks see:

Robot Structural Analysis 2018 Help: Soil Pressure - Parameters

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

[Anonymous · Accepted solution]

many thanks , 

i have studied it during college ... 

my exact question was about using them here ( in robot ) as i mentioned by Pic2 .. when we use them ? 

[Anonymous · Accepted solution]

thank you i will appreciate it