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SOIL SURVEY AND BACKFILL CONTROL IN FRENCHMAN FLAT.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Results of a soil investigation in the Frenchman Flat area of the Nevada Test Site to obtain data for underground projects in Programs 1, 3, and 6, on the character and certain physical characteristics of the soil to a depth of 200 feet are described. Determinations of the compaction characteristics of disturbed soil and the modulus of deformation of both undisturbed foundation and compacted backfill soils were major objectives, as it was desired that the backfill around the Project 3.1 structures and inside the Projects 1.4 and 1.7 instrumented holes have the same modulus of deformation as the natural foundation soil. Data from the field-control and the record samples indicated that procedures used in the field for processing, placing, compacting, and controlling the backfill material were adequate and that the desired conditions were obtained. Tests performed before and after the shot indicated that the water content and density of the natural soil and compacted backfill did not change significantly. Results of the tests of consolidation, constant ratio of applied stress triaxial, soniscope, and load bearing indicated that the soil modulus of the compacted backfill was about equal to that of the natural undisturbed soil when comparisons were made with similar types of tests. Author
APPROVED FOR PUBLIC RELEASE