水平厚层状岩质边坡地震动力破坏过程颗粒流模拟

doi:10.13722/j.cnki.jrme.2017.0145

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Abstract The failure modes，dynamic response and stress evolution characteristics of the thick-layered rock slopes with the non-persistent joints in different combinations of rock-bridge lengths and joint spacing were studied based on the two-dimensional particle flow code PFC2D. The results show that the main failure modes of the horizontal thick-layered rock slopes with non-persistent joint under the action of earthquake are collapse failure，tensile-sliding-block toppling failure and tensile-horizontal sliding failure. The horizontal non-persistent joint is the key factor to control the dynamic stability of the slope. The joint spacing plays a controlling role in the failure mode of the slope. When the joint spacing is small，the collapse failure is easy to occur. When the joint spacing is large，the tensile-sliding-topping failure and tensile-horizontal sliding failure occur normally. The length of rock bridge and joint spacing control the degree of rock fragmentation of slope and the number of sliding surfaces when slope fails. When the joint spacing is narrow or when the joint spacing is wide and the length of rock bridge is short，the single sliding failure occurs. When the spacing of the joint is wide and the rock bridge length is long，the double sliding surface damage occurs. Under the action of earthquake，the rock bridge section breaks down at first，and then the joints also produce damage and coalescence. The length of rock bridge and the width of joint spacing have a certain influence on dynamic response of slope. The peak displacement and peak velocity increase as the decrease of joint spacing and the increase of the length of rock bridge. The area with the PGA magnification factor influenced is concentrated at the slope toe and on the slope surface. The stress evolution in the rock-bridge of the slope has a good agreement with the acceleration of the input seismic wave.

Key words： slope engineering horizontal thick-layered rock slopes earthquake dynamic response failure mode particle flow code(PFC)

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	Articles by authors
	HU Xunjian1
	BIAN Kang2
	LI Pengcheng1
	CHEN Lingzhu1
	LIU Zhenping2

Cite this article:

HU Xunjian1,BIAN Kang2,LI Pengcheng1, et al. Simulation of dynamic failure process of horizontal thick-layered rock slopes using particle flow code[J]. , 2017, 36(9): 2156-2168.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0145 OR http://www.rockmech.org/EN/Y2017/V36/I9/2156

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