Journal article

Determination of the fracture toughness of a saturated soft rock

CM Haberfield, IW Johnston

Canadian Geotechnical Journal | Published : 1990


Although the literature provides a reasonable range of information concerning the fracture toughness of relatively hard rocks, there is virtually no data for saturated soft rocks of uniaxial compressive strengths less than about 10 MPa. To gain some insight into the plane strain fracture toughness of such a soft rock for use in the numerical modelling of crack propagation during pressuremeter testing, a large number of laboratory tests were conducted. The material used in these tests was a synthetic soft rock that modelled soft mudstone rocks reasonably accurately. The variation of fracture toughness with loading rate and with size and shape of the test specimens is presented and discussed. ..

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