TY - JOUR

T1 - Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

AU - Petrov, Yu.V.

AU - Smirnov, I.V.

AU - Volkov, G.A.

AU - Abramian, A.K.

AU - Bragov, A.M.

AU - Verichev, S.N.

PY - 2017

Y1 - 2017

N2 - This paper outlines the results of experimental study of the dynamic rock failure based on the comparison of dry and saturated limestone samples obtained during the dynamic compression and split tests. The tests were performed using the Kolsky method and its modifications for dynamic splitting. The mechanical data (e. g. strength, time and energy characteristics) of this material 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 structuraletemporal approach, is hereby presented. It is demonstrated that the temporal dependence of the dynamic compressive and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. Previously discovered possibilities to optimize (minimize) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optimal energy input value associated with critical load, which is required to initialize failure in the rock media, strongly depends on the incubation time and the impact duration. The optimal load shapes, which minimize the momentum for a single failure impact, are demonstrated. Through this investigation, a possible approach to reduce the specific energy required for rock cutting by means of high-frequency vibrations is also discussed. (C) 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

AB - This paper outlines the results of experimental study of the dynamic rock failure based on the comparison of dry and saturated limestone samples obtained during the dynamic compression and split tests. The tests were performed using the Kolsky method and its modifications for dynamic splitting. The mechanical data (e. g. strength, time and energy characteristics) of this material 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 structuraletemporal approach, is hereby presented. It is demonstrated that the temporal dependence of the dynamic compressive and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. Previously discovered possibilities to optimize (minimize) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optimal energy input value associated with critical load, which is required to initialize failure in the rock media, strongly depends on the incubation time and the impact duration. The optimal load shapes, which minimize the momentum for a single failure impact, are demonstrated. Through this investigation, a possible approach to reduce the specific energy required for rock cutting by means of high-frequency vibrations is also discussed. (C) 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

KW - Dynamic strength

KW - Incubation time criterion

KW - Split Hopkinson pressure bar (SHPB) test

KW - Tensile strength

KW - Compressive strength

KW - Water-saturated limestone

KW - Vibration-assisted rock cutting

KW - HOPKINSON PRESSURE BAR

KW - COMPRESSIVE STRENGTH ENHANCEMENT

KW - STRAIN RATES

KW - CONCRETE

KW - FRACTURE

KW - ENERGY

KW - BEHAVIOR

KW - SOLIDS

KW - IMPACT

U2 - 10.1016/j.jrmge.2016.09.004

DO - 10.1016/j.jrmge.2016.09.004

M3 - Article

VL - 9

SP - 125

EP - 134

JO - Journal of Rock Mechanics and Geotechnical Engineering

JF - Journal of Rock Mechanics and Geotechnical Engineering

SN - 1674-7755

IS - 1

ER -