Abstract
1. The static Poisson ratios of rocks increase with the pressure both under simple and under hydrostatic compression. The harder the rock, the less does the Poisson ratio μ depend on the load. 2. Increased moisture content increases the static Poisson ratio. The greater the moisture content, the greater is the influence of load on the Poisson ratio. The dynamic Poisson ratio is very much less sensitive to moisture than the static one. 3. Both under simple and hydrostatic compression, the dynamic Poisson ratio has a high value which agrees with the results of static tests at very high pressures.
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