In examining the Acoustic Emission (AE) method for earth dam stability monitoring, the question often arises as to the possibility of using the method for seepage monitoring. While a modest field test had been previously completed, a more controlled feasibility study, along with base-line data have been presented in this paper. Clear water seepage flow rates of approx 45 ml/s are required for AE detection using equipment and sensitivities described herein. For the case of turbid water seepage (as with an earth dam undergoing some degree of piping), the minimum detectable flow rate drops to approx 10 ml/s. The behavior of AE rates for flow velocities above these minimum values appears to behave as an exponentially increasing function (see Fig. 5). Here it can be seen that high flow rates produce proportionately many more emissions than do the lower flow rates. A modified experimental setup to test still higher flow rates would be necessary to evaluate AE generation through the laminar flow range into the turbulent regime. (Author)

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  • Accession Number: 00334009
  • Record Type: Publication
  • Report/Paper Numbers: Tech Note
  • Files: TRIS
  • Created Date: Sep 16 1981 12:00AM