SIMILITUDE OF DYNAMICALLY LOADED BURIED STRUCTURES.
Rept. for 1 May 62-31 Dec 64,
IOWA STATE UNIV OF SCIENCE AND TECHNOLOGY AMES
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Results of an investigation to determine similarity requirements for dynamically loaded buried structures are presented. Scaling relationships are developed and investigated experimentally. Tests were performed with small-scale structures buried at different depths and dynamically loaded in either a drop-weight loader or a shock tube. Hollow tubes instrumented with strain gages and solid blocks instrumented with accelerometers were used as the model structures. Three soil types were utilized in the test program dry Ottawa sand, dry sand mixed with mineral oil, and a cohesive Colo soil. Complete strain-time and acceleration-time curves were obtained at different depths of burial for a series of geometrically similar models and for a series of hollow cylinders of different stiffnesses. A detailed analysis of the data is presented. The results of the test program indicate that reliable predictions, based on the scaling relationships presented in the report, can be obtained for structures buried in dry sand. For more cohesive soils distortion is present and the use of prediction factors is required if the same materials are used in both the model and the prototype. Author