3.1.1 What does A indicate on this drawing?
3.1.2 Identify B - NSC Civil Technology Civil Services - Question 3 - 2021 - Paper 1
Question 3
3.1.1 What does A indicate on this drawing?
3.1.2 Identify B.
3.1.3 Excavations always cause some ground movement. Name any TWO factors that can cause ground mov... show full transcript
Worked Solution & Example Answer:3.1.1 What does A indicate on this drawing?
3.1.2 Identify B - NSC Civil Technology Civil Services - Question 3 - 2021 - Paper 1
Step 1
What does A indicate on this drawing?
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Answer
A indicates the ground level before excavation, which is sometimes referred to as the natural ground level (NGL).
Step 2
Identify B.
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Answer
B identifies the existing foundations that are being exposed by the excavation.
Step 3
Excavations always cause some ground movement. Name any TWO factors that can cause ground movement.
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Answer
Two factors that can cause ground movement include blasting and compaction.
Step 4
Deduce the slope of the excavation from the drawing.
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The slope of the excavation can be deduced as 1:2 or 1:1, indicating the ratio of vertical to horizontal distance.
Step 5
Name the TWO acceptable colours for the warning signals that should be visible around excavations.
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The two acceptable colours for warning signals around excavations are red and orange.
Step 6
Name TWO items that should NOT be placed near the edge of an excavation.
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Items that should not be placed near the edge of an excavation include heavy machinery/vehicles and any type of load.
Step 7
Describe briefly the process of soil compaction.
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Soil compaction is the process of increasing the density of soil by pressing the soil particles closer together. This can be achieved by reducing the volume of air trapped between the particles using hand compaction or a rammer.
