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Polymer Impregnation and Collection of Undisturbed Soil and Rock Samples

机译：聚合物浸渍和原状土和岩石样品的收集

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As a result of a 5.7-Richter magnitude earthquake which occurred near Auburn, California in August 1975, the Bureau of Reclamation elected to conduct further seismic investigations for the design of Auburn Dam. This report describes the application of concrete polymer materials technology to permit acquisition of undisturbed geologic seismic samples that were used to petrographically determine the time of last movement across the Maidu East shear zone at Auburn Dam, California. Various investigations involving excavation and sampling were performed in these studies. Test areas were impregnated with an acrylic plastic system which would permit removal of undisturbed samples. Impregnation was accomplished by soaking or ponding a monomer system composed of 95 percent MMA and 5 percent TMPTMA, by mass. Field trials using the surface impregnation technique were performed at two different sites. Results of these tests show that polymer impregnation can be used to strengthen and protect portions of shear and fault zones to permit acquisition of undisturbed samples for thin section analysis and testing.

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