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Dynam.c failure of dry and fully saturated lim.stone sam.les based on incubation tim. concept

Journal of Rock m.chanics and Geotechnical Engineering 2017年第1期9卷 125-134页

作者： Yuri v. Petrov Ivan v. Sm.rnov Grigory A. volkov Andrei K. Abram.an anatoliy m. bragov.stanislav.n. v.richev Saint Petersburg University Universitetskaya nab. 7-9 Saint Petersburg 199034 Russia Institute of Problem. of m.chanical Engineering Russian Academy of Sciences Bolshoj pr. 61 V.O. Saint Petersburg 199178 Russia Lobachevsky State University of nizhni novgorod Prospekt Gagarina 23 Nizhny Novgorod 603950 Russia Allseas Engineering B.v. Poortweg 12 Delft 2612 PA The Netherlands

This paper outlines the results of experim.ntal study of the dynam.c rock failure based on the com.arison of dry and saturated lim.stone sam.les obtained during the dynam.c com.ression and split tests. The tests were perform.d using the Kolsky m.thod and its m.difications for dynam.c splitting. The m.chanical data(e.g. strength, tim. and energy characteristics) of this m.terial at high strain rates are obtained. It is shown that these characteristics are sensitive to the strain rate. A unified interpretation of these rate effects, based on the structuraletem.oral approach, is hereby presented. It is dem.nstrated that the tem.oral dependence of the dynam.c com.ressive and split tensile strengths of dry and saturated lim.stone sam.les can be predicted by the incubation tim. criterion. Previously discovered possibilities to optim.ze(m.nim.ze) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optim.l energy input value associated with critical load, which is required to initialize failure in the rock m.dia, strongly depends on the incubation tim. and the im.act duration. The optim.l load shapes, which m.nim.ze the m.m.ntum.for a single failure im.act, are dem.nstrated. Through this investigation, a possible approach to reduce the specific energy required for rock cutting by m.ans of high-frequency vibrations is also discussed.

关键词： Dynam.c strength Incubation tim. criterion Split Hopkinson pressure bar(SHPB) test Tensile strength Com.ressive strength Water-saturated lim.stone vibration-assisted rock cutting

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