Calculate of Soil Spring Stiffness

Steps To Calculate soil stiffness as spring in sap : Stiffness

The force that cause unit displacement or unit rotation

1- Bearing Capacity Of Soil =

25.000

t/m2 =

2.500

Kg/cm2

2-a) Shell Area1 = 0.25*0.25 m =

0.063

m2 =

625.000

Cm2

2-b) Shell Area 2 = 0.5*0.25 m =

0.031

m =

2

312.500

Cm

2-c) Shell Area 3 = 0.25*0.25m =

0.016

m2 =

156.250

Cm2

3- Max. Allowable deflection in soil =

0.010

m =

1.000

Cm

2

2

Calculate of stiffness of soil as spring has 1 Cm deflection and force is equal to served area * bearing capacity/deflection (force / displacement) k1 = k1 = k1 =

156.250 78.125 39.063

t/m = 1562.500 Kg/Cm t/m = 781.250 Kg/Cm t/m = 390.625 Kg/Cm

450.000 225.000 112.500

Soil Pressure e =

Ka*soil density*h

U=

AX+BY+CZ+D

Water Pressure

(Traingular Pressure)

A=0

B=0

C = U/h

D=0

C=1

D=0

C=0

D=q

(Traingular Pressure) at z=0 p=0 at z=h p=water density*h

p=

water density*h

U=

AX+BY+CZ+D

Surcharge Pressure

A=0

(Uniform Pressure) at z=0 at z=h

p=

water density*h

U=

AX+BY+CZ+D

non uniform Pressure

B=0

p=0 p=q

A=0

B=0

(Trapozidal Pressure) at z=h1 p=Ui at z=h2 p=U2

p=

water density*h

U=

AX+BY+CZ+D

A=0

B=0

C = (U1-U2)/(hi-h2)

D = U2-h2((U1-U2)/(h1-h2)) or D = U1-h1((U1-U2)/(h1-h2))

D = U2-h2((U1-U2)/(h1-h2)) or D = U1-h1((U1-U2)/(h1-h2))

1- Defne Menu From define menu < Joint Pattern .< add new patterns

2- Assign Menu From Assign menu < Joint Pattern .< choose pattern name and put A,B,C AND D values

3- Assign Menu From Assign menu < Joint Pattern .< choose pattern name and put A,B,C AND D values