Preliminary Results from a Study of the Dynamic Geotechnical Properties of Coal Combustion Products (CCP)

摘要

America produces over 100 million tons of coal combustion products (CCP) annually, predominantly fly ash. CCP and mine waste impoundments have higher incidence of geotechnical failure than "traditional" geotechnical structures. Despite recent research, gaps in geotechnical knowledge of CCP remain. Given the prevalence of disposal facilities in regions susceptible to future earthquakes, understanding the seismic response of CCPs is particularly important. Most existing design procedures concerning seismic site response and liquefaction potential were developed for silica sands, and the applicability of these procedures to CCP has not been demonstrated. In response to these needs, a dynamic geotechnical laboratory testing program on coal fly ash is underway. Geotechnical characterization testing and stress-controlled cyclic triaxial tests have been performed. Here we present preliminary results of the laboratory work. A series of stress-controlled cyclic triaxial tests on moist-tamped samples showed that cyclic resistance generally increased with density. Sample preparation technique was given significant consideration, and these efforts are also summarized herein.