Abstract
The authors discuss the use of the point load test as a strength index for rock materials and as a means of estimating the uniaxial compressive strength. It is concluded that: (1) for relatively homogeneous rock material, the diametral point-load test is a reliable means of indexing the rock strength. (2) for rocks possessing near horizontal bedding or foliation, the diametral test is an unreliable indicator of the rock strength and axial testing perpendicular to the bedding is required to give a reliable rock strength index. Tests to study the influence of sample thickness on the axial point-load strength of drill core samples of different diameters are described. A suggested standard test method for determining the point-load strength index is set out. (TRRL)
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