rock-mass strength

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An estimate of the ability of a mass of rock to withstand shear stress. It is calculated on the basis of a Schmidt-hammer test to determine the intact rock strength, the extent of weathering, the spacing, width, continuity, infill, and orientation of joints, and the outflow of groundwater. Each of these factors is given a weighting and rocks are classified as very strong, strong, moderately strong, weak, or very weak.

Subjects: Earth Sciences and Geography.

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