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In the nature, phenomena of wave propagation through earth material, earthquakes and vibrations due to foundation of machines, traffics and explosions, are often encountered. These wave phenomena are essentially dependent upon the elastic properties of the earth materials, because they are generated by the interaction between the inertia force and the return force of the material. Therefore, the wave can not propagate unlimitedly through the material which does not create any return forces due to its deformation. Also, it is known from observation that plane waves traveling through any earth material are attenuated, even though they are in an infinitesimally small strain level, that is, their amplitude gradually decreases with traveling. The mechanism of attenuation, in other words, energy loss, is due to an internal friction of the material. Detailed observation of the wave phenomena will be able to reveal the elastic properties and the mechanisms of energy loss of the earth materials. The authorsl1)2) have endeavored the wave propagation test in the laboratory to offer the useful data in analysing the earthquake response of the ground and designing the foundation of vibrational machines. It is often convenient to use the word of "wavelength" in order to express the nature of wave. Since the size of a sample through which waves propagate is restrained in thee laboratory, the wavelength is needed to be made short, that is, the waves with high frequencies must be used. For this purpose, the shock tube has been used as a loading apparatus. The mechanical and failure characteristics of soils depend on a confining pressure. As a consequence, the wave characteristics will also depend on the confining pressure. The authors designed a new triaxial compression chamber connected with the shock tube in order to examine the one-dimensional wave propagation in the soil under different confining pressures. As an experimental procedure, a saturated clay specimen was consolidated under a certain confining pressure in the triaxial chamber and then a pulsative stress by means of the shock tube, was applied to the end of the soil rod, in which the wave is longitudinal. Throughout these rod wave propagation tests, the dynamic moduli of elasticity of saturated cohesive soils were investigated under different confining pressures. The strain dependency on the wave propagation characteristics was also examined.

STUDY ON STRESS WAVE PROPAGATION THROUGH SATURATED COHESIVE SOILS BY MEANS OF TRIAXIAL SHOCK TUBE