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Graduation Project Seminar
Analysis of Slope Stability & Design of Retaining Structure & Foundation for Multi-story Building
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Overview Analysis of Slope Stability Design of Retaining Structure
Design of Foundation for Multi-Story Building
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Study Area AL-Iskan road at AL-Junaid district.
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Surveying Plan
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Longitudinal Cross Section for the site
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Slope Stability Slope stability is the slope of the soil that make it stable.
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Method of Analysis There are several method to analysis slope stability: Infinite Slope. Logarithmic Spiral. Spencer. Morgenstern & Price.
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GeoStudio Software 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.
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Slope Profile Model: Mohr-Coulomb Unit Weight: 20 kN/m³
Cohesion: zero kPa Phi: 20 ° Bedrock
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Results
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Results Critical slip at radius = .782
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Improvement Stability of Slope
Grouting and Injection. Injection of pile. Cement grout. Vegetation. Retaining Structure. These methods increase the resistance and shear strength of the soil.
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Retaining Structure Retaining Wall. Boulders Wall.
Retaining structure are designed using prokon and Geo5 software.
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Retaining Wall Soil properties Bearing capacity = 250 KN/m²
Ø=20ᵒ, f’c=28 MPa, Fy=420 MPa, gsoil =20 KN/m2 Surcharge = 15 KN/m2
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Wall Layout
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Verifications Safety factor against sliding = 1.5
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 )
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Base bending moment
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Wall bending moment
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Reinforcement
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Boulders wall Properties of boulders Unit weight=25KN/m²
Angle of internal friction=30° Cohesion=0
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Boulders Dimensions
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Building’s Columns
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Pile Foundation 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
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Selected Piles Columns (80*20) Service Load=2158KN D(cm) L(m)
# of Piles Allowable Capacity(KN) 60 10 6 12 15 4 80 2400.4 3
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Selected Piles Columns (185*20) Service Load = 655 KN D(cm) L(m)
# of Piles Allowable Capacity(KN) 60 10 2 843.54 12 1039 15 1 655.89 80 1200.2 734.92 953.97
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Group of piles
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Pile Cap 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
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Plane for pile cap
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Depth of pile Cap H=600mm
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THANK YOU
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