Physical Property and Dynamic Compressibility Analysis of the Watching Hill Blast Range
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS VICKSBURG
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In the study, geologic, physical property, and dynamic static soil compressibility test data for the Watching Hill Blast Range at the Defence Research Establishment Canada, were analyzed. The site consists of a thick succession of glacial tills and lake deposits the near-surface deposit is composed of thin interbedded layers of lacustrine silt, sand, and clay sediments. The problem was to furnish accurate profile information for ground shock calculations of explosive events and to select stress-strain curves to represent the in situ response of each stratum to transient uiaxial strain loading and unloading. The analyses were conducted to determine if a simplified procedure could be developed for any location within the site for which a field boring log and conventional soil classification test data were available. Such a procedure was developed. A rough correlation was established between laboratory loading rates and those expected at various depths and surface overpressure ranges. Based on an analysis of 130 measured strain-strain relationships, curves were drawn to represent in situ uniaxial strain response of each soil classification group-profile zone combination.