束状炮孔爆破倾斜张开节理的动态断裂特性研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (6) : 151-158.

论文

李清，郭洋，徐文龙，彭阳，吕陈，马润东

作者信息 +

Investigation on the dynamic fracture property of oblique open-joints under bunch-hole explosion

LI Qing, GUO Yang, XU Wenlong,PENG Yang, LV Chen, MA Rundong

Author information +

文章历史 +

摘要

采用动态焦散线实验和ABAQUS数值模拟，对束状炮孔柱部区域和端部区域节理处裂纹的动态断裂特性进行了研究。结果表明，在炮孔柱部区域，初始爆炸应力波在张开节理处产生透射波与绕射波并与其相互叠加，节理端部产生拉剪应力集中形成翼裂纹，垂直于节理面起裂扩展。且节理近端翼裂纹扩展速度、扩展长度和裂纹尖端应力强度因子较节理远端处翼裂纹的相应值大。而次生裂纹是爆炸应力波在试件边界处产生的反射拉伸波与倾斜张开节理相互作用起裂的，并沿水平方向扩展。远端次生裂纹的起裂韧度约为翼裂纹的0.5倍，且由于反射波较弱，次生裂纹的扩展长度远小于翼裂纹。炮孔端部区域翼裂纹和次生裂纹是在倾斜张开节理处的反射拉伸波和绕射波与倾斜张开节理的相互作用下先后起裂的，翼裂纹偏向炮孔方向起裂，并向相反方向扩展，而次生裂纹近似沿着爆炸应力波的传播方向扩展。

Abstract

The dynamic caustic method and ABAQUS numerical simulation were used to study the fracture mechanics characteristics of oblique open-joints in the column area and at the end region under bunch-hole explosion in oblique open-joints medium. The transmitted wave and diffracted wave generated by the initial explosion stress wave in the oblique open joints are superimposed on the initial explosion stress wave and the wing crack in the column area of the borehole propagates perpendicularly to the oblique open-joints surface due to the tensile-shear stress. Compared with the wing crack at the near-end of oblique open-joints, the propagation speed, crack length and stress intensity factor of the wing crack at the far-end of oblique open-joints are bigger. The reflected tensile wave generated by the explosion stress wave at the boundary of the specimen and the oblique open-joints interact with each other so as to induce the happening of secondary crack, which initiates and propagates similarly along the horizontal direction due to the tensile stress. The initial toughness of the secondary cracks at the far-end of oblique open-joints is about 0.5 times that of the wing crack. The secondary crack length is shorter than the wing crack because the intensity of the reflected wave is weaker. The wing crack and secondary crack at the end area of borehole occur due to the interaction of the oblique open-joints with the reflected tensile wave and diffracted wave in the oblique open-joints. The wing crack tends to initiate in the borehole direction, and propagates in the opposite direction, while the secondary crack initiates and propagates gradually along the direction of explosion stress waves.

导出引用

李清，郭洋，徐文龙，彭阳，吕陈，马润东. 束状炮孔爆破倾斜张开节理的动态断裂特性研究[J]. 振动与冲击, 2019, 38(6): 151-158

LI Qing, GUO Yang, XU Wenlong,PENG Yang, LV Chen, MA Rundong. Investigation on the dynamic fracture property of oblique open-joints under bunch-hole explosion[J]. Journal of Vibration and Shock, 2019, 38(6): 151-158

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