Remolded and undisturbed samples of kaolinitic clay were compacted to maximum pressures ranging from 2,000 psi (140 kg/sq cm) to 6,500 psi (455 kg/sq cm) to observe changes in the fabric of the sample and chemistry of the expelled pore fluid. Samples were tested in high-pressure equipment specially designed to simulate aspects of geologic burial. The concentration of ions in the expelled pore water changed as compaction progressed, the major change being concurrent with the fall in pore-fluid pressure. Crystallization was present in the pores. The development of a preferred orientation clearly was associated with the level of effective stress. High pore pressures were associated with poorly oriented fabrics and incipient fissures.

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