Week 4 Challenge

Aim: Determine earth pressure on abutment wall from both sides (G.L and back filling side) using staddpro software

Introduction: - The height of abutment wall from top of abutment foundation is 7m which is back filling side and 3m at natural ground level side which shown in figure

Calculation of earth pressure

At natural ground level side

K_a=0.33 Coefficent of active pressure

Earth pressure at natural ground level side = K_a x "γ " unit weight of soil x depth of earth

where density of soil is 17 KN/m³

^{depth of earth =3 m}

Earth pressure =0.33 x 17 x 3 =16.83 KN/m²

Similarly

K_a=0.50 Coefficent of active pressure for Filling Material

=0.50 x 17 x 7 = 59.5 KN/m²

Procedure :

Lets Start Modelling in staddpro

Setp 1 : let start from creating plate’s model of retainning wall of size 0.5x0.5m

step 2: Translational repeat the plate in y and direction .in y direction the height of wall is 7 m and at z direction its 4m which is width of wall

Step 3: After creating wall using plate then assign thickness of 0.5 m to wall which shown in figure. After assigning the property to plates then assign fixed support to the wall plates

step 4:ADD LOAD CASE FOR NGL GROUND PRESSURE AND BACK FILL EARTH PRESSURE

step 5: Apply earth pressure from both side

for NGL side its 17.83 at bottom and 0 at 3 m height

and at backing side its 59.3 at bottom and zero at 7m heigth of wall which shown at figures

step 5: After apply both load on wall then we analysis the model which shown below

Results: We got result at post processing

AT result we got maximum bending at struture where 429 kn m/m which shown at the figure