GAGE PLACEMENT STUDY
Final rept. July 1962-May 1963
ARMOUR RESEARCH FOUNDATION CHICAGO IL
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A study was made of the various factors which affect the behavior of gages in soil. The ultimate objective of the study is to provide guides and recommended procedures for gage placement. Previous field and laboratory experience with stress, strain and motion measurement in soil was reviewed and a list of references provided. This was supplemented by an experimental investigation of embedded accelerometers to determine the importance of gage density and placement procedures on gage response. The most important factors influencing motion measurement appear to be 1 gage density in relation to the soil, and 2 placement conditions. Reproducibility of peak acceleration measurements was within 15 on the average. For a variation in accelerometer density of 55, a 12 percent difference in peak accelerations was observed for pendulum tests in sand and a 37 difference for shock tube tests in clay. Changing the static compaction pressures for placement of gages in clay from 12 psi to 42 psi resulted in a decrease of 22 in the peak accelerations recorded.
- Test Facilities, Equipment and Methods