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Development of Material for Modeling Rock

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Technical Report,01 Jan 1966,01 Dec 1966

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Army Engineer Waterways Experiment Station VICKSBURG United States

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Successful modeling of structures and explosive effects indicates that modeling of rock by the use of equivalent material could likewise prove fruitful. The purpose of this investigation was to develop mixtures of practical materials to model geological formations. The similitude principles utilized are a similar and similarly oriented Mohrs envelopes from triaxial tests of model and structural materials, and b coefficients of elasticity in the same relation. A literature review revealed that the most promising model material was probably a mixture of gypsum cement plaster, fillers, and water. Tensile, compressive, and triaxial strength tests and stress-strain tests were conducted on combinations of plasters, sands, and other filler materials. Results indicated that brittle rocklike material could be easily formulated to secure a wide range of physical properties. With regard to the above-mentioned principles, the stress-strain curves are linear over a wide range, but the triaxial stress condition is restricted by low phi angles, approximately 30 degrees compared to 40 degrees and above for most rocks.

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