Results of a study of the effect of low radial reinforcement pressure on the postfailure characteristics of two types of granite, a sandstone, and marble are presented. The low radial reinforcement pressure is applied to the rock surface by a gooch rubber sleeve. The gooch rubber sleeve provides a radial pressure of less than 1 psi pressure to the rock surface. This method of support gives an average strength increase of approximately 8 percent to the fractured rock sample.
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