Some Useful NumbersRock. 30°. Sand. 30-40°. Gravel. 35°. Silt. 34°. Clay. 20°. Loose sand. 30-35° . Cohesive strength (τ0) .. Field test for compressive strength of soils and rocks.crushing strength of rock,Empirical relations between rock strength and physical . - CiteSeerXIn this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of sedimentary rocks (sandstone.crushing strength of rock,Factors Affecting the Ultimate Compressive Strength of the . - wasetcompressive strength and other geotechnical properties. There is a marked increase in the compressive strength (UCS) from the first to the fourth ridge rock.
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