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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振动与冲击 ›› 2019, Vol. 38 ›› Issue (24) : 131-137.

论文

刘佳亮1,2,3，李坤元1，张娣1

作者信息 +

Broken area evolution characteristics and crack propagation rules of concrete under high pressure water jet crushing

LIU Jialiang1,2,3，LI Kunyuan1，ZHANG Di1

Author information +

文章历史 +

摘要

高压水射流冲击下混凝土内部裂纹扩展规律是洞察水力破碎机制的重要基础。借助相似材料、模型试验及高速摄像技术，构建了高压水射流冲击透明类混凝土冲蚀孔洞及裂纹扩展检测系统，研究了射流冲击混凝土冲蚀破碎区演化历程及裂纹扩展模式。结果表明，在射流冲击下混凝土破碎区演进过程分为三个典型阶段：水锤压缩区扩展、非压缩区扩展及侵彻贯通后扩展。在水锤压缩区冲蚀孔洞以近似“花瓣”状形态向自由面扩展，在冲蚀孔洞阵前面存在显著的塑性屈服区及交错裂纹网，并从理论上提出了冲蚀孔洞演进的临界判据；在非压缩区冲蚀孔洞近域塑性屈服区明显减少，材料去除演变为完全脆性破碎模式，冲蚀孔洞轴向演进速度呈现阶段性停滞；侵彻贯通后冲蚀孔洞径向维度将继续增大，并在孔壁近域出现不连续、半球状微裂纹区域，当扩展至初始贯通孔径2倍左右时，主冲蚀孔洞将趋于稳定。

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.

导出引用

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 Jialiang1,2,3，LI Kunyuan1，ZHANG Di1. 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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