A study on the stress wave characteristics and dynamic mechanical property of the sprayed concrete-surrounding rock combined body

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 85-91.

GUO Dongming1,2, YAN Pengyang1, Fan Longfei1, YANG Jun1, XUE Lei1，LI Yanyan1

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Abstract

In order to investigate the dynamic response problem of the medium around the adhesive surface made by the adherence of early age sprayed concrete on rock, a split Hopkinson pressure bar (SHPB) of 75 mm in diameter were adopted to study the stress wave propagation rules and dynamic mechanical properties of the sprayed concrete-surrounding rock combined bodies at the age of 3 d, 7 d and 10 d.The experimental results show that the transmission coefficient is closely related to the impact velocity and the age of concrete.It will decrease as with impact velocity for the specimens of 3 d, 7 d and 10 d.The transmission coefficient increases with concrete age under the same experimental velocity.The damage degree will increases gradually as the growth of the strain rate.The failure pattern of the concrete changes from tearing strain damage to crushing damage, and the rock presents the tensile failure mode.The dynamic compressive strength and the dynamic strength increasing factor increase with the growth of strain rate.When the strain rate is beyond 80 s-1, it shows the plastic property for specimens at the age of 3 d and brittle property for specimens at the age of 7 d and 10 d.

Key words

sprayed concrete-surrounding rock combined body / concrete age / transmission coefficient / failure pattern / dynamic compressive strength

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GUO Dongming1,2, YAN Pengyang1, Fan Longfei1, YANG Jun1, XUE Lei1，LI Yanyan1. A study on the stress wave characteristics and dynamic mechanical property of the sprayed concrete-surrounding rock combined body[J]. Journal of Vibration and Shock, 2018, 37(24): 85-91

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