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Abstract Study of the failure law of rock using deformation field evolvement methord is a significant project in rock mechanics deformation observation field，and it can put up the stress field of rock material intuitively during process of destruction. By using the deformation field monitoring system(GEO-Dscm system)，the deformation field evolvement has been observed in the failure procedure of rock material under cyclic load. The rock specimens are manufactured by marble plate，the cyclic loading is sine wave，with lower limit load and upper limit load are 10，130 kN respectively，the frequency is 0.04 Hz. The failure laws of rock material under cyclic loading are summarized according to the obersvation results of deformation failure process of multiple rock speciments. It is shown that the deformation of rock under cyclic loading experienced three stages：steady stage，localization stage and wreck stage. A law of deformation field evolution is shown that the severe deformation localization is occurred before rock failure and the deformation localization zone is formed. Along with the deformation concentration of localization zone，the macrocracks are occurred and the rock specimen is destroyed. Thus，a statistic which is used to describe the localization characteristic can indicate the process of deformation field evolvement. It will suddenly jump when the localization occures. For this reason，the statistics can indicat the failure of rock. It is expected that this methord can be used to predict and forecast disasters when field observation system is designed.
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Received: 25 July 2008
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