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42 Cards in this Set

  • Front
  • Back
Most of the soils that cover the earth are formed by weathering of rocks. Therer are 2 general types of weathering: mechanical and chemical.
True
Residual soil deposits are common in the southeastern US.
True
One disadvantage of cone penetration testing is the fact that no soil samples are recovered for classification purposes.
True
Friction ratio is useful for estimating soil type. A friction ratio of less than 2% usually indicates a clayey soil.
False
A standard split-barrel sampler used for standard penetration testing has a small enough area ratio to allow for the collection of "undisturbed" soil samples.
False
Standard penetration testing results in Nf values. Nf is the number of hammer blows to drive a split-barrel sampler through 12" of soil.
False
Nf (or simply N) values are also called standard penetration numbers.
True
Standard penetration testing cannot be conducted in collapsing soils.
True
Scraper bucket samples are sometimes referred to as shelby tubes.
False
Vane shear testing may be used to determine the in situ undrained shear strength of clays-particularly soft clays
True
In clay soils, effective overburden corrections for Nf values are not used.
True
An alluvial soil is transported soil deposited by wind action
False
Aeolian soil deposits derive from the action of streams and rivers.
False
A moraine is a glacial landform
True
Loess is a wind-deposited material consisting primarily of silt and silt-sized particles.
True
Saprolite is a highly plastic, clayey soil.
False
Loam is a mixture of soil grains of various sizes, such as clay, silt, and sand.
True
The natural moisture content of organic soils may exceed 200% or more
True
A piston sampler can provide very high quality "undisturbed" samples of clayey soils.
True
The most common method for advancing a bore hole in the US is to use a power-driven, hollow stem, helical, continuous-flight auger.
True
Seimic refraction surveys utilize shear wave velocity measurements to estimate the thickness of soil layers or depth to hard soil or rock.
False, P wave
Cross-hole seismic surverys utilize compression wave velocity measurements to estimate valuse of shear and Young's modulus.
False, shear wave
Electrical resistivity surveys utilize electrical resistance measurements to estimate subsurface soil conditions (soil type and layer thickness)
True
A saturated clay will probably have a higher electrical resistivity than sound rock.
False
The pressuremeter test utilizes volume and pressure measurements for an expanding cell pressing against surrounding soil to estimate in situ soil modulus.
True
According to Das, soil exploration costs should be 1-5% of the cost of the structure.
False
According to Das, continuous-flight augers are probably the most common method used for advancing a borehole.
True
The standard driving energy for advancing the split-spoon sampler when performing a SPT is provided by a 140-pound hammer falling through 1 foot.
False
According to Das, when performing a SPT, split-spoon samples are generally taken at about 5 ft depth intervals.
True
For granular soils, the value of SPT "N" is affected by the effective overburden pressure at the depth of the split-spoon sampler.
True
Scraper bucket samplers are generally used in cohesive soils.
False
Vane shear testing involves high-speed rotation of either rectangular or tapered vanes that have been inserted into clayey soils.
Fale
The static cone penetration test (CPT) was originally known as the French cone penetration test.
False
The CPT does not produce useful data in clayey soils because of the development of excess pore water pressure at the tip of the cone.
False
The flat-plate dilatometer test (DMT) is an in situ test that is conducted in a borehole. The test involves measuring the strength and deformability of the soil by expanding a measuring cell withe either liquid or gas.
False
An impact on the ground surface creates three types of stress waves: P waves (or plane or compression waves), S waves (or shear waves), and R waves (or Rayleigh waves-note:R waves are not mentioned in DAS). S waves travel faster than P waves.
False
Seismic refraction surveys are based on the travel time(or wave speed) of shear waves (S waves).
False
Resistivity surveys measure the electrical resistivity of soil (or rock) layers. A dense rock material can be expected to have a lower resistivity thana soft saturated clay.
False
Loess is an example of a glacial soil deposit
False
An aeolian soil is deposited by the wind
True
Marine clays with flocculent structures are rarely sensitive (that is, they usually have sensitivity ratios of 1.0 or close to 1.0)
False
Varved clay deposits are actually layers of silt and clay
True