# UNIVERSITY OF WOLVERHAMPTON by R5te8vj

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Module CV2000
Page 1 of 3

School of Engineering and the Built Environment

EXAMINATION PAPER
Open Book

CV2000                                   Geotechnical Applications

Date of Examination:                                   Semester 2 2006/7

Examiner:                                              Prof. R W Sarsby

Examiner(s) Room:                                      MI 150

Time Allowed:                                          2 hours

Number of Questions to be attempted:                   Attempt all three questions

All questions are equally weighted (unless otherwise stated) and are
marked on the grade point scale.

   One eight page answer book
   Other materials – one piece of graph paper per student

Instructions to Students:
   This is an open-book examination.
   Attempt all three questions.
   You should write legibly in black or blue ink.
   Calculators are permitted in this examination.
   PDA’s and mobile phones are not permitted in the exam.
   Assume typical values for any parameters that are needed for analysis but
which are not stated explicitly.
   State, and justify, all assumptions made in any analysis.

The University of Wolverhampton
School of Engineering and the Built Environment
Module CV2000
Page 2 of 3

1        (a)      Describe how the Taylor’s chart was derived and
discuss its applicability and limitations for practical
slope stability analysis.
32%
(b)      A temporary excavation, 5 m deep, is to be made at
a site where the ground stratigraphy consists of 8 m
of soft silty clay overlying very stiff boulder clay. The
side slopes of the cutting are to be 1 vertical to 1
horizontal. Properties of the soil strata are:
Silty clay – cu = 35 kN/m2, u = 8o,  = 18.7 kN/m3
Boulder clay - cu = 195 kN/m2, u = 2o,  = 22.0
kN/m3.

Estimate the Factor of Safety against rotational
failure of the cut slopes – identify and justify all
68%

2      The soil behind a 6 m high vertical retaining wall consists of
3 m of sand (c = 0,  = 35o,  = 18.0 kN/m3) over 3 m of
clay (c = 5 kN/m2,  = 20o,  = 20.0 kN/m3). A surcharge of
20 kN/m2 acts on the level surface of the sand and the
groundwater level is at the interface between the sand and
the clay.

(a)      Assuming the rear of the wall to be ‘smooth’, draw
the total Active earth pressure diagram for this wall.
68%
(b)      Determine the magnitude and line of action of the
total Active thrust on the wall.
32%

3        (a)      Outline the technical factors influencing the selection
of a retaining wall type for a given practical situation.
32%
(b)      Provide a technical explanation of why it is not
appropriate to use an undrained shear strength
approach in the design of a permanent cutting in a
saturated overconsolidated clay.
36%
(c)      Describe the effect that retaining wall ‘roughness’
has on earth pressures and discuss the validity of
treating a real retaining wall as being ‘fully rough’.
32%

The University of Wolverhampton
School of Engineering and the Built Environment
Module CV2000
Page 3 of 3

The University of Wolverhampton
School of Engineering and the Built Environment

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