断续节理岩体及岩质边坡破坏的细观机制

doi:10.13722/j.cnki.jrme.2015.1207

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Abstract The slope of Muliashi north open-pit copper mine in Zambia was selected as engineering background. Based upon particle flow theory and PFC2D(Particle Flow Code 2D) program，the rock block and joint were represented by bonded particle model and smooth joint model，respectively. The rock mass model containing two intermittent joints and rock slope model with bedding intermittent joints were constructed，and their failure mechanism were investigated from meso mechanical viewpoint. The failure research of rock mass with intermittent joints shows that the failure mode of rock bridge can be divided into four types such as mode I，mode II，mode III–a and mode III–b，which are essentially lead to by the dominated tensile microcracks between mineral grain bond. The failure research of rock slope with bedding intermittent joints shows that the microcracks caused by landslide primarily generate at the intermittent joint endpoint of bottom slope，and gradually develop towards top slope. The bottom shape of slide mass is relatively straight，while its tail shape is flexural and presents step-path failure. The fragmentized particle assemblies with relatively small volume primarily generate at middle and bottom part of slope，and then they generate at top slope with relatively large volume. During landslide，the particle contact force along rock bridge is relatively high，and the relationship between magnitude and count of microseismic events approximately obeys normal distribution function.

Key words： slope engineering intermittent joint rock mass meso failure mechanism particle flow theory PFC2D

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	Articles by authors
	ZHOU Yu1
	HAN Guang1
	2
	WU Shunchuan1
	HU Nailian1

Cite this article:

ZHOU Yu1,HAN Guang1,2, et al. Meso failure mechanism of rock mass and slope with intermittent joints[J]. , 2016, 35(S2): 3878-3890.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1207 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3878

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