Bearing Capacity Flood- Proof and Frost Proof: Soil Stabilization Methods Flashcards
1
Q
What are the effects of applying sand or gravel?
A
- Improves bearing capacity by replacing weak soil.
- Prevents frost damage by reducing water retention.
- Downside: Can cause differential settlement in weak subsoil.
2
Q
What is the Odemark formula used for?
A
To determine the required thickness of a sand layer to increase bearing capacity.
E 2=kรE3
Where:
๐ธ2= Elastic modulus of sand layer (MPa)
๐ธ3= Elastic modulus of subsoil (MPa)
๐= Empirical factor (between 2 and 4)
โ
3
Q
What is the role of geogrids and geotextiles?
A
- Geotextiles allow water flow while preventing soil particles from passing through.
- Geogrids reinforce weak soils by distributing loads more evenly.
4
Q
When are geogrids most effective?
A
When used on soils with a California Bearing Ratio (CBR) between 2-5%.
5
Q
Why is lime stabilization effective in clay?
A
Lime removes water from clay particles, making the soil stiffer and reducing plasticity.
6
Q
Why is cement stabilization less effective in clay?
A
- High amounts of bound water prevent proper cement bonding.
- Leads to cracking due to shrinkage.
7
Q
What are the benefits of using cement with additives?
A
- Prevents cracking in weak soils.
- Reduces sinking and settlement.
- Allows in-situ soil stabilization without excavation.
