A STUDY OF PARAMETERS AND METHODS INVOLVED IN RELATIVE DISPLACEMENT MEASUREMENTS IN SOIL.
Final technical rept. for Jan-Nov 64,
NEW MEXICO UNIV ALBUQUERQUE AIR FORCE SHOCK TUBE FACILITY
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A study of the parameters and methods involved in relative displacement measurements in soil was conducted. Static tests were performed to assess the influence and corrective measures necessary to eliminate the erroneous effects of arching, overstress, and lateral deformations of the coupling shaft found in spool gage displacement measurements. Stress wave reflections and gage lengths are discussed with reference to dynamic data collected in dry sand several months prior to this study. The study resulted in the formulation of a set of minimum criteria to be used when the spool gage concept is employed to measure relative displacements in soil. These criteria were applied to the design of a spool gage which was tested and compared with the performance of a magnetic coil displacement gage that is relatively free from mechanical mismatch effects. The results from the two gages tested in a controlled environment were very similar. Author