Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
Explain, using a sketch, how soil liquifaction works |
• when particles are in contact with each other the friction between them maintains the structure • when a vibration occurs and the particles are not in contact water can flow on between, resulting in fluid flow |
|
|
List two engineering solutions used to prevent the bankers hall in Calgary from collapsing |
1) bracing the foundation wall with steel beams 2) backfilling the area with aggregate |
|
|
Propose an engineering solution for preventing silty soil from getting to wet. |
Aeration of silty soils with sand helps stop silty soils from getting too wet |
|
|
What is a derivative map? |
A map that provides information on soil properties and provides insight into the suitability of a certain area for various land use activities. - can also provide information on susceptibility to natural hazards |
|
|
Provide three examples of a derivative map and explain what each tells you |
1) Soil amplification: tells the liquifaction susceptibility of an area 2) Slope stability: tells the probability of seismically induced slope failure 3) Land use maps: informs on the soil types and can be used to predict how land will react to precipitation |
|
|
List the 3 key parameters that determine the behavior of engineering soils |
1) Distribution of grain sizes in the soil 2) soil water content 3) types of clay minerals |
|
|
What does a cumulative grain size curve look like for a loess |
|
|
|
List two engineering characteristics for soils that contain a large proportion of gravel/ sand |
• strong, permeable, well- drained • not susceptible to frost heaving |
|
|
List two engineering characteristics for soils that contain a large proportion of silt |
• easily eroded and piped, weak • very susceptible to frost heaving |
|
|
List two engineering characteristics for soils that contain a large proportion of clay |
• strong when dry, weak when wet • low permeability, hard to drain • not susceptible to frost heaving • may swell and shrink |
|
|
List two engineering characteristics for soils that contain a large proportion of organics |
• very compressible, weak, mat shrink if drained |
