article: The engineering properties of cohesionless materials during vibration

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keywords:

[Digital Repository]

[Iowa State University]

[Thomas Leslie Youd]

[Civil Engineering Commons]

[microfilmed exactly as received]

[Soil Engineering]

[dirt]

[Signature was redacted for privacy.]

[shear strength of granular soils]

[critical void ratio]

[vibrational effects on shear strength]

[vibrational effects on density]

[densification]

[density]

[test apparatus and procedure]

[apparatus and materials]

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[suggestions for further research]

[literature cited]

[test data]

[vibrations which propagate through soils]

[vibrations which propagate thru soils]

[earthquakes]

[blasts]

[high-speed traffic]

[reciprocating and pulsating machines]

[reciprocating machines]

[pulsating machines]

[permeability]

[subject to vibrational effects]

[influenced by vibration]

[vibes]

[good vibrations]

[bad vibrations]

[designing foundations]

[designing bases]

[designing embankments]

[determining the safety of existing earth masses against failure]

[effect of shock and vibration on soils properties]

[slope failures]

[many structures settled more than three feet]

[rotated through an angle of eighty degrees]

[rotated through an angle of 80 degrees]

[catastrophic failures]

[settlement of soils adjacent to bridge abutments]

[under vibrating equipment]

[can also be beneficial]

[compaction of granular soils]

[vibratory compactors versus static compactors]

[achieving soil compaction]

[achieving compaction]

[patented processes]

[compaction with explosives]

[compaction via explosives]

[the effect of vibration on the mechanical properties of soil]

[safe engineering design]

[only a limited amount of knowledge is presently available]

[to isolate and study the basic dynamic properties of soil]

[the behavior of soil when subjected to vibration]

[reduction of shear strength during vibration]

[frequency and amplitude of vibration]

[no further mention will be made]

[sliding resistance]

[rolling resistance]

[frictional resistance]

[ensembles]

[interlocking of particles]

[internal friction]

[first known written remarks on the nature of friction]

[frictional resistance between two sliding bodies]

[proportional to the normal force]

[independent of the area of contact between the surfaces]

[coefficient of friction]

[Amontons second law]

[valid over a wide range of experimental conditions]

[the mechanism of friction between solids]

[the result of molecular bonding]

[real area of contact]

[plastic yielding]

[the contact between asperities]

[contact pressure]

[adhesion]

[junction growth]

[as the tangential force was gradually increased from zero]

[when slippage is imminent]

[maintaining proportionality]

[unlubricated surfaces moving past each other]

[optically smooth metals]

[irregular hills and valleys]

[atom diameters]

[metallic surfaces]

[non-metallic surfaces]

[microscopic interlocking]

[rough surfaces]

[x has been combined with y or neglected]

[resistance to sliding is the principal factor]

[dense sands]

[dilatancy]

[loose sands]

[separation into components]

[deformation]

[results in a volume change]

[a function of the applied stresses]

[dependence on type of test used]

[the stage of the experiment at which the value is determined]

[reduction of internal friction during vibration]

[angle of repose]

[estimating the angle of internal friction]

[loading platform]

[tangent versus acceleration ratio]

[of little value statistically]

[numerous graphs]

[EVR]

[typo: ‘effecting’ for ‘affecting’, p.83]

[oscillating normal stresses]

[radians per second]