1. The experiments showed that the actual characteristics of resistance to shearing of a vibrating (in the direction of the action of the shearing force) surface on soil differs greatly from that determined only during the effect of a single loading.
2. In dry sand this resistance most nearly corresponds to the hypothesis of dry friction, during which the coefficients of external friction due to the effect of vibrations appear much less (five times in this experiment) than the static, which, evidently, explains the formation of the effect of roll over of the grain and sand in the boundary layer.
3. In moist sands and water saturated sands and also in soft sandy loams, the form of friction approximates viscous friction during vibrations. At standard pressures from 0.5 to 1 kg/cm2, i.e., near to that observed during pile driving, the coefficient of visous friction appears equal for low-moisture course sands; 0.3 to 0.5 kg · sec/cm; for water saturated sands; 0.2 to 0.5 kg · sec/cm; for soft sandy loams; 1.4 to 1.6 kg · sec/cm.
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, Vol. 1 No. 3, pp. 5–8, March, 1964
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Perlei, E.M. The effects of vibrations on the forces of external friction of soils. Soil Mech Found Eng 1, 147–152 (1964). https://doi.org/10.1007/BF01703664
- Boundary Layer
- Civil Engineer
- Sandy Loam
- Structural Foundation
- Hydraulic Engineer