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Study online at https://quizlet.com/_2rsylz
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1. The strength of a soil, or the ability to compact a soil into a suitable construc-
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tion material will depend on?: Soiltype
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Soil density
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The amount of water in the soil
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2. Types of soils: Gravel (mm to cm's in size) Sa
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nd (mm in size)
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Silt (fine particles with little cohesion) C
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lay (has cohesion, can stick together) Or
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ganic soils (peat, topsoil)
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3. Organic soils (O): Have a large componet of dead or decaying plants, and are not used in construction
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4. Silt and Clay: Classified based on whether the soil is plastic (clay) or non-
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plastic (eg. can you roll it into a ball or string)
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5. Gravel and Sand: areclassifiedbasedonwhetherornotalltheparticlesareroughlythesamesize(uniform, like a b
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each) or if there is a large variety in particle size (well-graded).
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6. Soil layers: 1. (complex zone) 3 to 4m
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2. (glacio-lacustrine clay) 2-12m 8l 8l
3. Glacial till, up to 9m in thickness 8l 8l 8l 8l 8l 8l
4. Carbonate bedrock, the upper surface of which is often fractured, weathered and irrgular
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7. Soil has two componets of strength: Cohesion (clay only) Fr
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iction (when individual soil grains move across on another)
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8. The three types of shear failure of soil are: general shear failure (bulging / tilting) local
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shear failure (slight bulging)
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punching shear failure (little to no bulging)
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9. Soil strength is used to determine: The bearing capacity of a foundation The
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stability of natural or man-made earth slopes or retaining walls
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10. Test for soil strength include;: Unconfinedcompressiontest Di
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rect shear test
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Triaxial compression test
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11. Soil strength depends upon: density and moisture content
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12. Unconfined compression test: useful for determining the strength of soils 8l 8l 8l 8l 8l 8l 8l 8l 8l
18l/8l14
, ICC (EC) Soils - Material Testing (edit), combined
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Study online at https://quizlet.com/_2rsylz
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13. Gradation refers to the range of measured soil particle sizes. Gradation 8 l 8 l 8 l 8 l 8 l 8 l 8 l 8 l 8 l 8 l 8l
results in classifying soil types as: Boulders(>12") 8l 8l 8l 8l 8l 8l 8l 8l 8l
Cobble ( 3" to 12" ) Gravel 8l 8l 8l 8l 8l 8l 8l
( >2 m m ) 8l 8l 8l
Sand ( 0.075 to 2 mm ) Sil 8l 8l 8l 8l 8l 8l 8l
t ( 0.002 to 0.075 mm ) Clay
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( <0.002 mm )
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14. The particle size distribution of coarse- 8 l 8 l 8 l 8 l 8 l
grained soils is typically determined by?: Mechanical sieve analysis 8 l 8 l 8 l 8 l 8l 8l 8l 8l
15. The particle size distribution of fine-grained soil is determined using a
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?: hydrometer analysis
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16. Two parameters help to identify soils that are well- 8l 8l 8l 8l 8l 8l 8l 8l
graded?: The Coeflcient of Uniformity (Cu) 8l 8l 8l 8l 8l
The Coeflcient of Curvature (Cc)
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17. The hydrometer analysis is used to determine the gradation of: slitandclay-
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sized particles. 8l
18. Only soil particles passing the # 40 sieve (0.425) are used in the: hydrometer anal
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ysis
19. Hydrometer readings give us two things?: Thespecificgravity,ordensity,ofthefluidtellsus the % 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l
of material still in suspension.
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The average downward velosity of the hydrometer can give us the diameter of the particle that is just coming out of solution.
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20. The Swedish soil scientist, 8l 8l 8l 8l
, developed a method of quantitatively describing the effect of soil moistur
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e on the consistency of fine-grained soils.-
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: Albert Atterberg
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21. Although Atterberg proposed five limits only the following three are in co 8l 8l 8l 8l 8l 8l 8l 8l 8l 8l 8 l
mmon useage today.: LiquidLimit 8l 8l 8l 8l
Plastic limit Shrinka 8l 8l
ge limit 8l
22. Only the Liquid Limit and Plastic Limit are normally used to?: classifysoil plasticity
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28l/8l14