TEMPERATURE EFFECT ON SHEAR WAVE VELOCITY IN CLAYS

A series of constant temperature low-amplitude resonant column tests were performed to determine the effect of specimen temperature on the shear wave velocity of seven cohesive soils. Samples of each soil were tested at temperatures of 22 deg C and 4 deg C to reproduce typical conditions for laboratory testing and extreme field testing respectively. Five of the soils were "undisturbed" field samples and two were prepared in the laboratory. Soil types varied from sensitive clays to insensitive silty clays, and typical soil characteristics are tabulated. During the low-amplitude tests samples were subjected to a constant confining pressure and a constant temperature. Drainage was permitted during the entire test interval. The shear wave velocity was evaluated during short periods of vibration applied at intervals throught the duration of the determine the time-dependent increase of shear wave velocity for each temperature. Results of the long-time and short-time tests are presented. It was concluded on the basis of the tests, that the short-time changes in temperature affect the shear wave velocity, probably by changes in pore pressure, but these effects are temporary if drainage is permitted. During the initial reloading of a sample in long-time tests, the shear wave velocity increase with time could be divided into two portions analogous to primary and secondary consolidation. The end of the primary period occurred at times between 100 min and 1000 min for the samples tested in this study. Therefore, any conclusions from test results should be based on wave velocities established at comparable times within the secondary range. The effects of decreasing the testing temperature from 22 deg C to 4 deg C to 4 deg C varied from 0 percent to 12.5 percent increase of the shear wave velocity measured at 1,000 min and 22 deg C. Thus the influence of testing temperature has a minor influence on the shear wave velocity.

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  • Accession Number: 00080827
  • Record Type: Publication
  • Report/Paper Numbers: Proc. Paper 10981 Tech. Note
  • Files: TRIS
  • Created Date: Mar 6 1975 12:00AM