Broken area evolution characteristics and crack propagation rules of concrete under high pressure water jet crushing
LIU Jialiang1,2,3，LI Kunyuan1，ZHANG Di1
1.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2.National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China;
3.Engineering Research Center of Bridge Structure and Materials in Mountain Area, Chongqing Jiaotong University, Chongqing 400074, China
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.
刘佳亮1,2,3，李坤元1，张娣1. 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[J]. 振动与冲击, 2019, 38(24): 131-137.
LIU Jialiang1,2,3，LI Kunyuan1，ZHANG Di1. Broken area evolution characteristics and crack propagation rules of concrete under high pressure water jet crushing. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 131-137.
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