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 引用本文: 周文海, 胡才智, 包娟, 郑俊杰, 梁瑞. 含节理岩体爆破过程中应力波传播与裂纹扩展的数值研究. 力学学报, 2022, 54(9): 2501-2512.
Zhou Wenhai, Hu Caizhi, Bao Juan, Zheng Junjie, Liang Rui. Numerical study on crack propagation and stress wave propagation during blasting of jointed rock mass. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(9): 2501-2512.
 Citation: Zhou Wenhai, Hu Caizhi, Bao Juan, Zheng Junjie, Liang Rui. Numerical study on crack propagation and stress wave propagation during blasting of jointed rock mass. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(9): 2501-2512.

## NUMERICAL STUDY ON CRACK PROPAGATION AND STRESS WAVE PROPAGATION DURING BLASTING OF JOINTED ROCK MASS

• 摘要: 岩体中存在着大量自然形成的节理, 这些节理导致岩体的力学性质、振动、渗透、能量传递等多种性能发生改变. 爆炸应力波在含节理岩体中的传播与衰减也随着发生改变, 进而影响工程爆破的效果及安全性. 对含节理岩体的爆生裂纹扩展与爆炸应力波传播规律进行研究, 通过建立含节理岩体的爆炸数值模型得到节理两侧岩体的有效应力和振动速度, 并利用应力波的波动理论与能量密度理论计算出节理的透反射系数和透反射能量比. 在此基础上研究节理几何参数(节理填充物厚度D、爆源到节理的法向距离R、爆源到节理的竖向距离H、节理倾角 \theta )对含节理岩体爆生裂纹扩展的影响以及上述参数与节理的透反射系数和透反射能量比关系. 结果表明当节理位于裂纹区且爆源到节理的竖向距离H与法向距离R之比H/R = 1时, 节理的反射系数及反射能量比处于最大值, 切应力成为此范围内影响节理面损伤的主要因素; 节理近爆侧岩体的破碎区域面积与节理填充物厚度D成正相关; 节理近爆侧岩体的破碎区域面积与爆源到节理的法向距离R和爆源到节理的竖向距离H成负相关; 当节理位于裂纹区时, 节理对岩体的爆破碎岩效果影响最大.

Abstract: There are a large number of naturally formed joints in natural rock mass, which lead to changes in the mechanical properties, vibration, permeability, energy transfer and other properties of rock mass. The propagation and attenuation of blast stress waves in the rock mass with joints also change, which affects the effect and safety of engineering blasting. The explosion crack propagation and explosion stress wave propagation law of the jointed rock mass are studied, and the effective stress and vibration velocity of the rock mass on both sides of the joint are obtained by establishing the explosion numerical model of the jointed rock mass. The transmission and reflection coefficient and the transmission and reflection energy ratio of the joint are calculated by using the stress wave wave theory and energy density theory. On this basis, the effects of joint geometric parameters (joint filler thickness D, normal distance R from blast source to joint, vertical distance H from blast source to joint, joint inclination \theta ) on the expansion of blast cracks at different positions of the joint were studied. And the relationship between the above-mentioned joint geometric parameters and the joint's transmission and reflection coefficient and transmission and reflection energy ratio. The results show that when the joint is located in the crack area and the ratio H/R of the vertical distance H from the blast source to the joint to the normal distance R is equal to 1, the reflection coefficient and reflected energy ratio of the joint are at the maximum value, and shear stress becomes the main factor affecting the damage of joint surface within this range. The fracture area of the rock mass near the explosion side of the joint is positively correlated with the thickness D of the joint filler. The fractured area of the rock mass near the blast side of the joint is negatively correlated with the normal distance R from the blast source to the joint and the vertical distance H from the blast source to the joint. When the joint is located in the crack area, the joint has the greatest impact on the blasting effect of the rock mass.

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