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Retaining walls design.pdf

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McGill University
Civil Engineering
CIVE 463
Hameed A.Mirza

Design of cantilever walls Thursday, April 19, 2012 11:00 AM Failures: Foundationfailure • Stability failure • Rotational failure Design steps 1. Evaluation of soil pressures a. Active pressure b. Passive pressure 2. Checkstability of the wall a. Lateral sliding b. Overturning i. Active pressure ii. Bearingpressureon the soil iii. Failureof the soil surroundingthe foundation 3. Structuraldesign of wall components a. Shear b. Flexure c. Reinforcement(design+ detail) Basic Information γs Unit weight of soil qa Soil bearingcapacity (allowable) φ Angle of friction μ Coefficient of friction between soil and concrete Some typical values of γs and φ are γs (kN/m3) φ° Sandy gravel 17-22 35-45 Loose sand 15-16 30-35 Crushedrock 12-22 35-40 Ashes 9-10 35-40 Brokenbrick 15-16 35-40 Soil Pressures Rankineequations Active pressureon backfill side passive pressure on other side A uniformsurcharge on top of the soil will result in a uniformpressureacross the height of the retained material, given by Ca Pressure exerted by a retained material Active pressure (wall moves away from soil) Passive soil (wall moves towards soil) *To actually develop passive resistance the concrete must have been placed without using forms for the toe and without disturbingthe soil * Frequently neglected
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