United States Department of Transportation
i
Evaluation of electronic logging and gamma ray device for bridge boring interpretation.
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1971-07-01
[PDF-1.18 MB]
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Abstract:Since shallow electric logging devices and gamma ray devices (for use in holes of less than 200 feet in depth) have recently been developed, it was the aim of this work to ascertain if correlation between electric logs and/or gamma ray logs and known conditions could be resolved to determine engineering parameters of the soils encountered, such as soil type, density, shear strength, bearing capacity, etc.
A statistical approach was to be attempted using regression analysis in the hope that the relative importance of each parameter could be defined. With this information it was thought that the instruments could be used to interpret foundation conditions which would be useful to bridge designers in establishing pile lengths, bearing capacities and number of pile.
A previous study performed here in Louisiana entitled "Pressuremeter Correlation Study" by C. M. Higgins correlated the Menard-Pressuremeter developed by L. Menard of France to Louisiana foundation soil strength characteristics. this device uses hydrologic pressure applied to the walls of the bore hole and measures the yielding characteristics of the soils at depth. These characteristics are then used to compute strength and consolidation curves for each layer. The correlation worked well for this device, and it was hoped the logging device studied here could be used in conjunction with the Pressuremeter to furnish a nearly complete testing program in the field without sampling and laboratory testing.
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