Analysis of Slope Stability & Design of Retaining Structure & Foundation for Multi-story
Building
2011-2012
Graduation Project Seminar
» Analysis of Slope Stability
» Design of Retaining Structure
» Design of Foundation for Multi-Story Building
» AL-Iskan road at AL-Junaid district.
Surveying Plan
Longitudinal Cross Section for the site
Slope stability is the slope of the soil that make it
stable.
There are several method to analysis slope
stability:
»Infinite Slope.
»Logarithmic Spiral.
»Spencer.
»Morgenstern & Price.
» The project is dealing with slope of the soil by
using GeoStudio software.
» This software is based on Morgenstern & Price
method.
» It gives you a simple analysis for slope stability
and critical slip for the soil.
Model: Mohr-CoulombUnit Weight: 20 kN/m³Cohesion: zero kPaPhi: 20 °
Bedrock
Critical slip at radius = .782
» Grouting and Injection.
» Injection of pile.
» Cement grout.
» Vegetation.
» Retaining Structure.
» These methods increase the resistance and shear
strength of the soil.
» Retaining Wall.
» Boulders Wall.
» Retaining structure are designed using prokon
and Geo5 software.
» Soil properties» Bearing capacity = 250 KN/m²» Ø=20ᵒ, f’c=28 MPa, Fy=420 MPa, gsoil =20 KN/m2
» Surcharge = 15 KN/m2
» Safety factor against overall sliding = Fr/Fh = 1.519
» Safety factor against overturning = Mr /Mo = 5.072
» Over turning(manually)= 3
» Safety factor against sliding = 1.5» Safety factor against overturning = 2.5
» (Seismic Design )
» Properties of boulders
» Unit weight=25KN/m²
» Angle of internal friction=30°
» Cohesion=0
» Using AllPile software to design pile foundation.
» design for two diameter (60, 80) cm and
3lengths (10, 12, 15) m.
» Soil properties:
» C=40KN/m² , Phi=15° , Unit weight=18KN/m³
Columns (80*20)
Service Load=2158KN
D(cm) L(m) # of Piles Allowable Capacity(KN)
60 10 6 2530.63
60 12 6 3117.01
60 15 4 2623.56
80 10 4 2400.4
80 12 3 2204.76
80 15 3 2861.91
Columns (185*20)
Service Load = 655 KN
D(cm) L(m) # of Piles Allowable Capacity(KN)
60 10 2 843.54
60 12 2 1039
60 15 1 655.89
80 10 2 1200.2
80 12 1 734.92
80 15 1 953.97
» Design pile footing for column (20*80 cm).
» Diameter= 80 cm f’c=400 kg/cm² =32 MPa L=12 m
#of piles = 4 piles
» Allowable capacity=2940 KN
» pult. =2836 KN
» pserv. =2157 KN
Fu=2836/4=709 KN
H=600mm
THANK YOU