软弱夹层对爆炸应力波传播过程的影响研究

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Abstract Aiming at the propagation process of explosive stress wave in rock mass with weak interlayer, the influence of thickness, position and angle of weak interlayer on the propagation of explosive stress wave was discussed by numerical simulation.The results show that: the explosive stress wave reflects at the interface of the weak interlayer, and the tensile stress wave makes the energy of the stress wave converge at the upstream, which aggravates the damage degree of this part of rock mass.With the increase of the thickness of weak interlayer, the peak value of tensile stress in front rock mass propagates from near-wave surface to surrounding rock mass, and the peak value of tensile stress increases gradually.Meanwhile, the barrier effect of interlayer increases, and the attenuation of effective stress peak value in back rock mass accelerates.The decrease of the distance between the weak interlayer and the initiation center makes the peak tensile stress of the rock mass in front of the interlayer increase significantly, while the barrier effect on the rock mass behind the interlayer decreases gradually.The energy of stress wave mainly converges in the vertical direction of weak interlayer, which causes the cracks produced by rock blasting to deviate from the horizontal survey line and develop toward the normal direction of weak interlayer.The results can be used to guide the blasting construction design of tunnels in similar strata.

Key words： blasting weak interlayer stress wave propagation numerical simulation influence mechanism

Received: 29 April 2019 Published: 15 August 2020

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	Articles by authors
	SUN Ningxin1
	LEI Mingfeng1
	2
	ZHANG Yunliang1
	SU Guangming3
	HUANG Guofu4

Cite this article:

SUN Ningxin1,LEI Mingfeng1,2, et al. A study on the influence of weak interlayer on the propagation process of explosion stress wave[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(16): 112-119.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I16/112

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