Dynamic Shearing Resistance of Dry Ottawa Sand

by Kenan Atakol, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; The Pennsylvania State University, University Park, PA,
H. Gordon Larew, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Virginia, Charlottesville, VA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 2, Pg. 705-720

Document Type: Journal Paper


A relationship between: (1) Rate of deformation in simple shear; (2) overburden pressure; (3) shearing strength or stress on the failure plane at the time of failure; and (4) initial void ratio and changes in void ratio has been determined. A simple shear apparatus was used to conduct the tests, with which simple shear or homogeneous deformation throughout the sample was obtained. Overburden pressures simulating soil depths up to 100 ft were employed. Dynamic shearing of the specimen was accomplished in 0.004 sec or less, and static shearing in 120 secs or less. A projectile fired from a gun activated by an explosive charge was used to initiate shearing of the specimen in the dynamic case, and a conventional metal lathe was employed in the static case. A maximum rate of deformation, expressed in terms of angular velocity, of 400 rad per sec was obtained. A mathematical equation describing a three-dimensional surface which relates shearing strength, overburden pressure, and rate of deformation (angular velocity) was derived.

Subject Headings: Shear deformation | Soil dynamics | Shear resistance | Shear strength | Shear stress | Load and resistance factor design | Shear failures | Failure analysis

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