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Excel formula for designing retaining wall. soil engineering.
Retaining Wall Design
Compound Wall Data :There is a filling of 1.2 m in proposed site from f rom neighbor site level. Type of soil is murmur at 1.8 m deep below the neighbors plot level. And soil SBC is taken as 20 T/m² at depth depth of 1.8m Compound wall is designed as retaining cum compound wall. Soil density is taken as 2200 kg/m³ ( soil + water unit weight ) Angle of repose taken as 25 º ( assumed . Self weight of structure Sl. No.
Area
a b c d e f g
unit wt 0.02 0.28 0.45 0.45 0.54 0.66 0.81
moment arm
2500 2000 2400 2400 2400 2400 2400
load
moment
0.09 0.12 0.3 0.38 0.45 0.55 0.68
43.75 552 1080 1080 1296 1584 1944
4.082 63.48 324 405 583.2 871.2 1312.2
total
7579.75
3563.162
Soil intensity Sl. No.
Area
s1 s2 s3 s4
unit wt 0.45 0.36 0.27 0.15
moment arm
2200 2200 2200 2200
Total load
10285.75
Total Moment
6432.512
moment
0.98 1.05 1.13 1.23
990 792 594 330
965.25 831.6 668.25 404.25
total
2706
2869.35
Resisting moment
Design Data:Density of soil taken :ø :SBC of so soil :20 T/m²
2200 kg/m³ 25 °
Overturning pressure due to soil :w h³ * 6
load
[ 1 - sin ø] [ 1 + sin ø]
Page 1 of 4
w= h= ø=
2200 3 25
Sin 25 = 1 - sin 25 = 1 + sin 25 =
0.42 0.58 1.42
((1-sinø)/(1+sinø)) = 0.41 Overturning =
4018.18 kg.m
1. Check for overturnig :Resisting moment > 1.5 * overturning moment due to soil 6432.512
>
6027.27
Factor of safety = resisting moment / overturning moment 1.6 > 1.5 Therefore, safe 2. Check for Sability :Factor of safety = ( μ * W ) / p μ= W=
0.5 10285.75
p = (1/3) * w * (h²/3)
=
3300 kg/m
Factor of safety
1.56 > 1.5
Therefore, safe 3. Check for Eccentricity :e=(b/2)-z
z = total moment / total load z = 0.63
b (m) = 1.35 e =
0.05
< b/6
0.23
Therefore, safe 4. Intensity of pressure at base :p=(W/b)*(1±((6*e)/b)) p (max) =
9299.302
kg/m²
p (min) =
5938.846
kg/m²
p (max) and p (min) are less than SBC of soil.
Therefore, safe
Page 2 of 4
Compound Wall Coping in PCC 1:2:4 a Brick Work in C.M 1:6
0.23 1.2
Note : 1. All dimensions are in Meters. 2. Not to scale
b
PCC 1:2:4
0.15
Soil filled up
s1 0.75 Neighbor Site
c Weep holes 0.6
1.2
d G.L
s2
0.6 0.75 0.6
e
Coursed rubble masonry in C.M 1:5 s3
0.9
0.6
f
s4 1.1
0.6
g 1.35
PCC in 1:4:8
0.1 1.5 Note:1. Brick work in superstructure to be in CM 1:6. 2. Brick wall to be plastered in CM 1:5,15 mm thick. 3. Coursed rubble masonry in CM 1:5. And racking f inish to be provided. 4. Bond stone shall be provided at every 1.2 m horizontally and 0.6m vertically staggered at every course. 5. Construction joint to be provided at every interval of 6 m, 20 mm thick. 6. 75 mm dia pipe at 1 m interval to be provided horizontally and vertically staggered. 7. Weep hole should be given a fall of 1.8 from back of compound wall 8. Minimum height of weep hole from the base is 300 mm above the ground level. 9. Any changes in details to be consulted with respective Executive Engineer.
