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DEC 302 – Geotechnical Engineering

DIPLOMA IN CIVIL ENGINEERING
GEOTECHNICAL ENGINEERING
(DEC 302)

ASSIGNMENT NO. 1

NAME

ID NO

LECTURER: NOORBAYA BINTI MOHD SALLEH
DATE OF SUBMISSION:

SEPT 2012

Page 1 of 4

DEC 302 – Geotechnical Engineering

QUESTION 1 [TOTAL = 50 MARKS]
a)

Indicate THREE (3) differences of short term stability and long term stability for slope failure analysis.
[CLO1-PLO2:C1] (6 marks)

b)

Discuss briefly THREE (3) methods of changing geometry of the slope for the purpose of slope stabilization.
[CLO1-PLO2:C2] (6 marks)

c)

Explain and illustrate briefly FOUR (4) types of slope failure.
[CLO1-PLO2:C3] (8 marks)

d)

For the slope shown in Figure Q1 (d), find the factor of safety against sliding for the trial surface AC.

Figure Q1 (d)
[CLO1-PLO6:C4] (15 marks)

SEPT 2012

Page 2 of 4

DEC 302 – Geotechnical Engineering

e)

Figure Q1 (e) shows a slip circle. By using the method of slices for total stress analysis, calculate the factor of safety against slipping along failure surface AB for the following conditions:
i.
ii.

Allowing for the tension crack empty of water
Allowing for the tension crack when full of water

4m

γ = 21kN/m3 c = 10 kN/m2 ϕ = 12˚

PLO2:C3] (8 marks)
Figure Q1 (e)
[CLO1-PLO6:C4] (15 marks)

SEPT 2012

Page 3 of 4

DEC 302 – Geotechnical Engineering

QUESTION 2 [TOTAL = 50 MARKS]
a)

Discuss briefly the principle of Rankine’s active and passive state.
[CLO2-PLO2:C2] (5 marks)

b)

A retaining wall with a smooth vertical back of height 9m retains soil having an unsurcharged horizontal surface. The position of water table is 5m from the bottom. The soil properties are: c’ = 0

ϕ’ = 32˚

γsat = 20.5 kN/m3

and above WT, γ =18kN/m3

Determine the distribution of horizontal stresses on the wall and also the magnitude and position of the resultant horizontal thrust when the groundwater level is standing (without
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