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An apparatus has been designed and built that will fit into an ordinary triaxial test chamber. Torsional vibration can be induced in the cylindrical soil specimen, and vibration response, during the “static” application of the triaxial stresses can be measured. The dynamic apparatus includes transducers for measuring the pore pressure and axial load.
This apparatus can be used to study the effects of vibration on various soil properties conventionally determined by the triaxial test. It can be used to determine the dynamic shear modulus or shear wave velocity, and to study the damping, or energy dissipative, characteristics of soils.
The boundary conditions for the specimen and properties of the apparatus are simply defined, so that the analytical solution for the specimen-apparatus system, including damping of the apparatus and specimen, has been obtained. This allows interpretation of test results in terms of soil properties.
The results with this apparatus on the variation of shear modulus with confining pressure for dry sand agree well with previous results.
soil mechanics, vibration, triaxial tests, shear modulus, damping, wave propagation, soil (material)
Hardin, B. O.
Associate professor of civil engineeringPersonal member ASTM, University of Kentucky, Lexington, Ky.
Graduate assistant, University of Kentucky, Lexington, Ky