Crack formation mechanism of concrete with an initial crack under hydraulic impacting

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 130-135.

LIU Jialiang1,2,3,ZHANG Di2,DU Shujian2,WANG Haiyang2,3

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Abstract

In order to explore the breaking mechanism of concrete with initial cracks under hydraulic impacting, a numerical model was established based on the smooth particle hydrodynamics (SPH), and the evolution process of concrete crushed in the crack area was quantitatively investigated by using the image processing technology.The results show that at the weak influence zone of an initial crack, the water hammer effect causes shear fracture in concrete on liquid-solid contact boundaries, resulting in a bowl-shaped crushing pit.At the strong influence zone of the initial crack, cracks nearby the upper tip of the initial crack are induced by combined effects of the compression-shear stress on liquid-solid contact boundaries and the stress concentration at the upper zone of the initial crack.Then synergistic actions of the water wedge and concrete wedge effects, combined with the stress concentration at the lower zone of the initial crack produce the cracks nearby the lower tip of the initial crack.Conical cracks are caused by the superimposed stress waves reflecting on free boundaries and on the initial crack.The degree of concrete crushing decreases along the water jet axis direction with different attenuation rate, indicating that the initial crack has significant blocking effect and strong interference action on the evolution of concrete crushing.

Key words

hydraulic impacting / concrete / initial crack / smooth particle hydrodynamics (SPH) / image processing technology

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LIU Jialiang1,2,3,ZHANG Di2,DU Shujian2,WANG Haiyang2,3. Crack formation mechanism of concrete with an initial crack under hydraulic impacting[J]. Journal of Vibration and Shock, 2020, 39(14): 130-135

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