Evaluation of dynamic compaction in Tulsa, Oklahoma (FHWA-OK-86-3) 2141

Abstract

This report describes the installation and monitoring of three test sections to evaluate dynamic compaction as it was applied as a foundation treatment for the approach fills of an interchange on the Gilcrease Expressway (SH 11) in north central Tulsa. The test sections were monitored to assess the performance of dynamic compaction and to provide the data base for recommending changes to the construction process as foundation conditions varied. Evaluation of the results obtained from the three test sections monitored during the dynamic compaction process indicated that the process improves the strength characteristics of strip mining spoil containing clay with shale fragments and trash. The most consistent improvement occurred in areas where the thickness of the trash was less than a few feet. The presence of a groundwater table did not appear to adversely affect the results. In areas of thicker trash layers, stone columns were successfully constructed using dynamic compaction. With the exception of the inclinometers, all instrumentation performed well and provided very good data to evaluate the dynamic compaction procedure.