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- W2076772336 abstract "Changes in compressional wave velocity and amplitude of ultrasonic energy are investigated in about 25 ultramafic rock specimens stressed to fracture under simple compression. The samples studied include pyroxenites, dunites, peridotites, ecolgites and serpentinites, collected from important ultramafic rock suites associated with chromite and magnesite mines of India. In all the samples, up to 50 per cent of the fracture stress, both velocity and amplitude are found to increase with increasing stress, but at different rates in different samples depending on their porosity values. The slope of the velocity/amplitude-stress curve decreases during 50–75 per cent of the fracture stress, and is characterized by a negative sign beyond this stress level in a majority of the samples due to the decrease of velocity and amplitude as the applied stress approaches the fracture strength of the test specimen. Amplitude changes are found to be more prominent than the velocity changes, particularly within a few per cent of the fracture stress. These changes are accounted due to the development of microfracturization at about half the fracture stress, leading to the dilatant behaviour of the rock samples. Eclogites are found to be an exception to this behaviour characterized by the absence of dilatancy as revealed through the absence of negative pressure derivatives of velocity and amplitude. The variations in anelastic parameters ‘α’ and ‘Q’ with stress are in accordance with the changes in amplitude and velocity. The fracture strength-velocity relationship is found to be nearly linear for the samples studied. Simultaneously, stress-strain measurements are also attempted in a few samples, the results of which are also presented and discussed. These measurements yielded values of elastic constants that are comparable to the dynamic constants and stress-volumetric strain data support the ultrasonic observations of the dilatant behaviour of rocks." @default.
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- W2076772336 date "1974-05-01" @default.
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- W2076772336 title "Dilatant behaviour of ultramafic rocks during fracture" @default.
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- W2076772336 doi "https://doi.org/10.1016/0148-9062(74)90886-9" @default.
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