Graduation Project Seminar

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Presentation transcript:

Graduation Project Seminar Analysis of Slope Stability & Design of Retaining Structure & Foundation for Multi-story Building 2011-2012

Overview Analysis of Slope Stability Design of Retaining Structure Design of Foundation for Multi-Story Building

Study Area AL-Iskan road at AL-Junaid district.

Surveying Plan

Longitudinal Cross Section for the site

Slope Stability Slope stability is the slope of the soil that make it stable.

Method of Analysis There are several method to analysis slope stability: Infinite Slope. Logarithmic Spiral. Spencer. Morgenstern & Price.

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.

Slope Profile Model: Mohr-Coulomb Unit Weight: 20 kN/m³ Cohesion: zero kPa Phi: 20 ° Bedrock

Results

Results Critical slip at radius = .782

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.

Retaining Structure Retaining Wall. Boulders Wall. Retaining structure are designed using prokon and Geo5 software.

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

Wall Layout

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 )

Base bending moment

Wall bending moment

Reinforcement

Boulders wall Properties of boulders Unit weight=25KN/m² Angle of internal friction=30° Cohesion=0

Boulders Dimensions

Building’s Columns

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

Selected Piles Columns (80*20) Service Load=2158KN D(cm) L(m) # of Piles Allowable Capacity(KN) 60 10 6 2530.63 12 3117.01 15 4 2623.56   80 2400.4 3 2204.76 2861.91

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

Group of piles

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

Plane for pile cap

Depth of pile Cap H=600mm

THANK YOU