On the Role of Stress Waves on Process of Explosive Destruction of Rocks
The article deals with the problem of explosive predisintegration of rocks with stress wave propagation. Despite the difference in approaches to the estimation of the role of gas and wave factors a classical system of notions has been formed about blast effect on the rock mass. The basic alteration of rock properties by blast is caused by intensive fracturing in a zone immediately adjacent to a charge, and also by the formation of a system of radial fractures. However, currently a mountain of experimental evidence is available, which proves the rock mass flaws resulting from a blast in the predisintegration zone. The experimental evidence is presented with the estimates of elastic wave velocity and rock strength before and after the blast action in the zone of pre-disintegration. It is noted that the effect of high-amplitude short-duration stress waves on rocks results in the formation of numerous microscopic defects, which development pattern depends on rock petrographic characteristics, strength and elastic properties. A model is proposed describing the growth of microscopic defects within the concept of mechanics of scattered flaws. The model considers the experimental facts showing that in brittle rocks the development of microscopic fractures occurs, when stresses exceed the static strength and the pulse is of certain duration. Predisintegration process essentially depends on the amplitude and time of stress wave action, as well as on the anisotropy factor and heterogeneity of the medium. Formation of a pre-disintegration zone with the propagation of stress waves enhances its attenuation intensity as compared with that of the elastic zone. Stress waves essentially contribute to the process of rock disintegration under blast effect.
A.N.Kochanov
Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Russia
国际会议
厦门
英文
62-64
2011-08-10（万方平台首次上网日期，不代表论文的发表时间）