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Main points of this past exam are: Determine Factor of Safety, Disturbing Shear Stress, Taylor’s Chart, Residual Shear Strength, Coulomb’s Analytical Method, Components of Maximum Thrust, Angle of Wall Friction, Bearing Capacity
Typology: Exams
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(NFQ – Level 8)
Answer five questions Examiners: Mr T. Corcoran. Prof. P. O’Donoghue Mr J P Murphy
τ
F = c +σ^ tan φ, where σ = normal stress and τ = disturbing shear stress.
(15 marks)
Fig Q (b) What is residual shear strength and what is its relevance to slopes that have previously failed? (5 marks)
(Useful formula: Ka =
sin( ) sin( ) sin( )sin( )
cosec sin( - )
The safe bearing capacity of the soil is 250 kN/m^2. The soil behind the wall carries a uniform surcharge of 10kN/m^2. Check the proposed design against failure in sliding, overturning and bearing capacity in accordance with BS 8002 (use a factor of 1.2 on the shear strength of the soil).
Fig Q3 (20 marks)
D (^) kN/m (^2) or ≈ 400 N kN/m (^2) )
Bachelor in Engineering in Structural Engineering Geotechnical Engineering Summer 2005
Taylor’s Stability chart
Fadum’ Influence Factors