Aimone-Martin, C. T., K. I. Oravecz, and T. K. Nytra. 1994. 
TDR Calibration for Quantifying Rock Mass Deformation at the WIPP Site, Carlsbad, New Mexico.
Proceedings of the Symposium on Time Domain Reflectometry in Environmental, Infrastructure, and Mining Applications, Evanston, Illinois, Sept 7-9, U.S. Bureau of Mines, Special Publication SP 19-94, NTIS PB95-105789, pp. 507-517
(posted June 19, 1996)

Time domain reflectometry (TDR) laboratory experiments have been conducted using cylindrical salt cores from the Waste Isolation Pilot Project (WIPP).  TDR has been used as an instrumentation technique to quantify the type and magnitude of rock mass deformations. Laboratory tests were conducted to correlate measured salt core deformation with changes in reflected waveforms for shear, tensile, and combined shear and tensile deformations. Coaxial cables grouted within rock cores were crimped to produce localized reference defects. The evaluation of waveform characteristics produced thus far during rock deformation experiments shows a good correlation of cable response with both shear and tension as well as combined shear and tension.