Practical - geology quiz (questions 2005) PDF

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Geology Quiz (questions 2005)...

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University of Technology, Sydney Faculty of Engineering 48330 Soil Behaviour Geology Quiz

Student No. GEOLOGY QUIZ Time allowed: 1 hour

Write your answer in the space provided or circle the correct answer from the list.

1. A granite is composed of 70% quartz, 20% feldspar and 10% mica. What soil would this granite weather to: (a) clay (b) sand & clay (c) gravel & sand (d) clay & sandstone 2. Briefly explain the difference between Gabbro and Dacite. a) b) 3. Feldspars weather to clays. Under what natural circumstances might clays change back to feldspar? 4. Which of the three plate boundaries is destructive? 5. What is chert?

6. What are the agents of erosion? 7. Name 2 minerals that join the grains of clastic sedimentary rocks. a) b) 8. What is the Rock Mass Rating for a weathered damp shale with RQD = 85% with widely spaced fractures? (a) 52% (b) 50% (d) 48% (e) None of these.

9. A core of rock is recovered with a total length of 2.5 m. The distances to fractures (measured in metres from one end of the core) are: 0.29, 0.45, 0.52, 0.58, 0.92, 0.98, 1.07, 1.64, 2.09, 2.14, 2.18, 2.27 and 2.36. What is the Rock Quality Designation for this rock? (a) 90% (b) 72% (d) 78% (e) None of these. 10. A tunnel is taken through Class IV rock. The equivalent dimension of the tunnel roof is 3m. Which of the following roof support systems would be most applicable to this tunnel? (a) cast concrete

(b) no support

(c) bolts and shotcrete

(d) pattern bolting

11- A Geological Map of an area containing a very prominent rock outcrop known as Big Bluff is produced below. You are required to draw the stratigraphic section along the Line AB. (i) Below the map is the profile of the ground surface along the Line AB. Draw the section there:

Tertiary granite

5o

Triassic shale

30o

A

B 30o

75o

Recent basalt

Triassic sandstone Fault Big Bluff Ground profile

SECTION AB

(ii) Answer the following, give a very brief reason for your answer. (a) Which is the oldest rock around Big Bluff? (b) Do you think the shale and sandstone originally covered Big Bluff? If yes why aren’t they there at present?

(c) Why is there no angle of dip given for the granite on the map? (d) If north is to the top of the map what is the approximate strike of the shale beds between Point A and Big Bluff? Note simply give the answer, no reason required....