中低速冲击载荷下巷道内裂纹的动态响应

doi:10.13722/j.cnki.jrme.2016.1403

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Abstract Tunnels contain radial cracks due to the blasting excavation，and these cracks affect the tunnel stability significantly. In order to study the dynamic fracture behavior of tunnels containing radial cracks under the impact loading，the medium and low speed impact experiment was carried out by using the sandstone tunnel models，and the finite difference code AUTODYN was used for the numerical simulation. The propagation path and the arrest of the crack under the impact loading were studied，and the crack initiation toughness and propagation speed were calculated with the experimental-numerical-analytical methods. The fracturing behaviors of surrounding rock under the static and dynamic loadings are quite different. The damage under the dynamic loading is only the crack initiation and propagation at the crack tips，whereas the damage under the static loading occurrs at the crack tip，arch shoulder，arch foot and sidewalls. The propagation path of the radial crack is along the original direction of the crack under the impact loading，and the crack arrest phenomena was observed clearly in the propagation path. The experimental-numerical-analytical method can be used to determinate the initiation and propagation speed quite well. The curves of the dynamic stress intensity factors of cracks versus the time were obtained by using the displacement extrapolation method. The dynamic initiation toughness was determined using the initiation time measured with the strain gauges.

Key words： rock mechanics tunnel crack impact loading numerical simulation propagation speed dynamic initiation toughness

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	Articles by authors
	ZHOU Lei1
	2
	ZHU Zheming1
	2
	DONG Yuqing1
	2
	YING Peng1
	2

Cite this article:

ZHOU Lei1,2,ZHU Zheming1, et al. Dynamic response of cracks in tunnels under impact loading of medium-low speed[J]. , 2017, 36(6): 1363-1372.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1403 OR http://www.rockmech.org/EN/Y2017/V36/I6/1363

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