Module CV2000
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            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.

Additional Materials Required:
   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.
   Design information is included at the end of this paper.
   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.
           (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

                    Estimate the Factor of Safety against rotational
                    failure of the cut slopes – identify and justify all
                    assumptions made in your analysis.

  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.
           (b)      Determine the magnitude and line of action of the
                    total Active thrust on the wall.

  3        (a)      Outline the technical factors influencing the selection
                    of a retaining wall type for a given practical situation.
           (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.
           (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’.

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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