Podcast
Questions and Answers
What phenomenon may be caused by overlapping regions in concrete?
What phenomenon may be caused by overlapping regions in concrete?
Which of the following is a hazard associated with working in trenches?
Which of the following is a hazard associated with working in trenches?
What may early-stage cracking in concrete be a result of?
What may early-stage cracking in concrete be a result of?
Which support system is used for preventing structural movement?
Which support system is used for preventing structural movement?
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What does the precast panel solution involve?
What does the precast panel solution involve?
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What challenges can arise when using sheet piles?
What challenges can arise when using sheet piles?
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Which wall solution is effective for small to moderately high walls?
Which wall solution is effective for small to moderately high walls?
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What could excessive reinforcement lead to during construction?
What could excessive reinforcement lead to during construction?
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What is the purpose of rock bolts in the attached mesh solution?
What is the purpose of rock bolts in the attached mesh solution?
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What is a primary concern when using over-reinforcement in concrete structures?
What is a primary concern when using over-reinforcement in concrete structures?
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Study Notes
Question 1
- Overlapping concrete regions can cause concrete segregation, excessive reinforcement can lead to restrained shrinkage and early-stage cracking. This makes site work harder and can impact concrete pouring quality.
- Working in trenches and excavations is hazardous. Potential hazards include equipment/soil falling, flooding, and workers falling into trenches.
Question 2
- Reinforced concrete pile walls (contiguous and secant) are options.
- Sheet pile walls can be difficult and expensive if driving into rock.
- Gabion cage walls are effective for medium-height walls.
- Attached mesh with vegetation involves steel mesh, rock bolts, and is effective at retaining rock but may have problems supporting soil above.
- Precast panels can be placed in front of excavations, held in place with tie-backs into rock, and increase longitudinal spacing between rock anchors.
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