Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

Chapter 7 RETAINING WALL
Note: As ground water levels are the same on both active and passive sides of the wall, pressures
due to water are ignored.
Active pressures
P a at 0.00 m below G.L. in loose sand
= 0.3 x 10.00 = 3.0 kN/m 2
P a at 4.50 m below G.L. in loose sand
= 0.3 x 88.75 = 26.63 kN/m 2
P a at 4.50 m below G.L. in loose sand
= 0.260 x 88.75 = 27.89 kN/m 2
P a at 5.50 m below G.L. in loose sand
= 0.260 x 167.25 = 43.49 kN/m 2
P a at 11.50 m below G.L. in loose sand
= 0.260 x 167.25 = 43.49 kN/m 2
Passive pressures
P p at 3.50 m below G.L. in loose sand
= 4.8 x 0.00 = 0.00 kN/m 2
P p at 4.50 m below G.L. in loose sand
= 4.8 x 17.50 + 0.00 = 84.00 kN/m 2
P p at 4.50 m below G.L. in loose sand
= 5.8 x 17.50 + 0.00 = 101.50 kN/m 2
P p at 5.50 m below G.L. in loose sand
= 5.8 x 36.00 = 208.80 kN/m 2
P p at 11.50 m below G.L. in loose sand
= 5.8 x 96.00 = 556.80 kN/m 2
7-34 March 2009