exam-2011-questions.pdf - lOMoARcPSD|3344572 Exam 2011 questions Geotechnical Engineering(University of Melbourne StuDocu is not sponsored or endorsed

exam-2011-questions.pdf - lOMoARcPSD|3344572 Exam 2011...

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StuDocu is not sponsored or endorsed by any college or universityExam 2011, questionsGeotechnical Engineering (University of Melbourne)StuDocu is not sponsored or endorsed by any college or universityExam 2011, questionsGeotechnical Engineering (University of Melbourne)Downloaded by Arzoo Chaudhari ([email protected])lOMoARcPSD|3344572
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THE UNIVERSITY OF MELBOURNE DEPARTMENT OF INFRASTRUCTURE ENGINEERING FIRST SEMESTER EXAMINATION, MONDAY 6 JUNE 2011CVEN90050 GEOTECHNICAL ENGINEERING Pass and Honours Exam Duration: Three (3) hours Reading Time: 15 minutes This paper has SIXTEEN (16) pages Authorised Materials: ° This is a closed book examination. ° Approved Calculator (School of Engineering). ° Drawing instruments (drawing compass, rulers, protractors, erasers, pencils). ° Access to internet prohibited. Instructions to Invigilators: ° Final Exam paper to be returned together with the script booklet. ° Check for stickers that approved calculators must have. Instructions to Students: ° Candidates should attempt ALL SEVEN (7) questions. Read the questions CAREFULLY. ° Answers should be written in the script booklet, except for the last few questions (5, 6, and 7) which must be answered on the exam paper, which must be returned. ° BE NEAT AND CLEAR. It is not the instructor’s job to guess what you “really mean”. ° Include final answers and procedures to obtain them. ° Include UNITS. Final numerical answers without units are worthless (unless dimensionless). ° Maximum possible mark is 180 in 180 minutes of examination. ° Questions are NOTof equal weight. (Marks allocated to each question within parentheses) Paper NOT to be lodged with Baillieu Library Student ID: Downloaded by Arzoo Chaudhari ([email protected])lOMoARcPSD|3344572
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CVEN90050 Geotechnical Engineering Page 2 of 16 Student ID: _ _ _ _ _ _ _ _ _ _____________________________________________________________________________ Write your answers in your script booklet for questions 1 through 4; write your answers in the exam paper for questions 5 through 7.GEOTECHNICAL STRENGTHQuestion 1:(a)For standard penetration tests conducted in certain materials and under certain conditions, the following correction is applied to the measured N value: N΄= 15 + 0.5(N-15) What materials require this correction, under what conditions and why is it applied? (15 Marks) (b)An SPT test was conducted at a depth of 15m in a borehole drilled into a sandy gravel. No groundwater was encountered during the drilling. The numbers of blows recorded from the 3 successive lengths of penetration of 150mm were 9, 15 and 16. Estimate the corrected N value and explain how you arrived at this value. (5 Marks) (Total marks for Question 1 = 20) Question 2:A saturated over-consolidated silty clay is estimated to have the effective strength parameters: c´ = 5kPa, and = 25º A specimen of the silty clay is mounted into a triaxial cell and fully consolidated to 400kPa with a cell pressure of 500kPa and a back pressure of 100kPa. With the drainage then turned off, the specimen is slowly loaded axially to failure. At failure, the porewater pressure was measured to
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