3.1 FIGURE 3.1 below is a drawing of a temporary excavation exposing the existing foundations - NSC Civil Technology Civil Services - Question 3 - 2021 - Paper 1
Question 3
3.1 FIGURE 3.1 below is a drawing of a temporary excavation exposing the existing foundations. Study the drawing and answer the questions that follow.
3.1.1 What do... show full transcript
Worked Solution & Example Answer:3.1 FIGURE 3.1 below is a drawing of a temporary excavation exposing the existing foundations - NSC Civil Technology Civil Services - Question 3 - 2021 - Paper 1
Step 1
What does A indicate on this drawing?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A indicates the ground level before excavation, commonly referred to as the natural ground level (NGL).
Step 2
Identify B.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B identifies the concrete slab or floor slab that is exposed during the excavation.
Step 3
Excavations always cause some ground movement. Name any TWO factors that can cause ground movement.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Two factors that can cause ground movement include:
Blasting
Piling
Step 4
Deduce the slope of the excavation from the drawing.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The slope of the excavation can be deduced to be 1:2 or 1:2, indicating a safe angle for stability.
Step 5
Name the TWO acceptable colours for the warning signals that should be visible around excavations.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The two acceptable colours for warning signals around excavations are:
Red
Orange
Step 6
Name TWO items that should NOT be placed near the edge of an excavation.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Two items that should not be placed near the edge of an excavation are:
Any type of load
Equipment
Step 7
Describe briefly the process of soil compaction.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Soil compaction is the process of increasing the density of soil by pressing the soil particles closer together. This can also involve reducing the volume of air trapped between the particles using hand compaction tools or a rammer.
