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Investigation of Weak Sandstones

Abstract It is proposed that coverage of the class of material described in BS 5930 as weak rock, is in need of improvement. Results from research into the behaviour of weak sandstone (0.5-20 MPa uniaxial compressive strength) are presented to illustrate this need. The strength, deformability, and propagation of compressional waves are reported for weak sandstones and recommendations presented for describing these materials and for testing their strength and deformability. Problems associated with the measurement of compressional wave velocity are also considered. An index test for assessing the strength of weak sandstone (the index of vacuum saturated moisture content) is described and presented.