高压水射流冲蚀混凝土破碎区演进特征及裂纹扩展规律研究

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Abstract The internal crack propagation rules in concrete under high pressure water jet impingement are the fundamental issue of hydraulic breaking concrete mechanism.Through the similar material and model method and the high speed photography technology, an erosion hole and crack propagation detection system of the high pressure water jet impacting transparent similar-concrete material was built.A detailed study on the evolution process of the erosion zone and the crack propagation mode was performed.The results show that the high pressure water jet erosion can be divided into three typical evolution processes: the expansion in the water hammer compression zone, the expansion in the non compression zone, and the extension after penetration.In the water hammer compression zone, the erosion hole expands to the free surface in the form of a "petal" shape, and there is a significant plastic yield zone and staggered crack network in front of the erosion hole.The critical criterion for the evolution of the erosion hole was proposed theoretically.In the non compression zone, the plastic yield zone near the erosion hole has a sharp decrease and the material removal has evolved into the completely brittle fracture mode, and the axial evolution velocity of the erosion hole presents periodical stagnations.After penetrating, the radial dimension of the erosion hole continues to increase, and the discontinuous and micro hemispherical crack region appears near the hole wall.When the erosion hole diameter extends to about two times of the initial hole, the main erosion hole will tend to be stable.

Key words： high pressure water jet concrete model test crack

Received: 06 July 2018 Published: 15 December 2019

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	LIU Jialiang1
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	LI Kunyuan1
	ZHANG Di1

Cite this article:

LIU Jialiang1,2,3, et al. Broken area evolution characteristics and crack propagation rules of concrete under high pressure water jet crushing[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 131-137.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I24/131

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