Impact damage of cement rock subjected to short-time uniaxial compressing
Kadomtsev A. G.1, Shcherbakov I. P.1, Chmel A. E.1
1Ioffe Institute, St. Petersburg, Russia
Email: chmel@mail.ioffe.ru
An application of high hydrostatic pressure is the effective procedure decreasing porosity and conditioning the mechanical properties cement rock (CR). In the present paper, the effect of the uniaxial compression of the aging-treated CR on its impact-strength in the direction orthogonal to the applied pressure was investigated. The test geometry falls in line with the distribution of outer forces in built structures, where a constant vertical load is combined with the horizontal dynamic action of forces of various origine. The localized damage development in laboratory samples was controlled by the acoustic emission method, which is sensitive to the CR structure destruction at the micromechanical level. It was revealed that a cycle of static loading modifies the character of the energy yield resulted from the localized impact produced in a loaded and off-loaded sample in dependence of the applied vertical pressure. Keywords: axial pressure, repeated load, acoustic emission.
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