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	Influence of intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening
	Zhang SR(张社荣) ; Sun B(孙博) ; Wang C(王超) ; Yan L(严磊) ; ZHANG She-rong ; SUN Bo ; WANG Chao ; YAN Lei
	2016-03-30 ; 2016-03-30
关键词	rock mechanics intermediate principal stress hard rock with pre-existing circular opening failure mechanism discrete element TU45
其他题名	Influence of intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening
中文摘要	Based on particle flow theory, the influences of the magnitude and direction of the intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening were studied by carrying out true triaxial tests on siltstone specimen. It is shown that peak strength of siltstone specimen increases firstly and subsequently decreases with the increase of the intermediate principal stress. And its turning point is related to the minimum principal stress and the direction of the intermediate principal stress. Failure characteristic(brittleness or ductility) of siltstone is determined by the minimum principal stress and the difference between the intermediate and minimum principal stress. The intermediate principal stress has a significant effect on the types and distributions of microcracks. The failure modes of the specimen are determined by the magnitude and direction of the intermediate principal stress, and related to weakening effect of the opening and inhibition effect of confining pressure in essence: when weakening effect of the opening is greater than inhibition effect of confining pressure, the failure surface is parallel to the x axis(such as σ2=σ3=0 MPa); conversely, the failure surface is parallel to the z axis(such as σ2=20 MPa, σ3=0 MPa).; Based on particle flow theory, the influences of the magnitude and direction of the intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening were studied by carrying out true triaxial tests on siltstone specimen. It is shown that peak strength of siltstone specimen increases firstly and subsequently decreases with the increase of the intermediate principal stress. And its turning point is related to the minimum principal stress and the direction of the intermediate principal stress. Failure characteristic(brittleness or ductility) of siltstone is determined by the minimum principal stress and the difference between the intermediate and minimum principal stress. The intermediate principal stress has a significant effect on the types and distributions of microcracks. The failure modes of the specimen are determined by the magnitude and direction of the intermediate principal stress, and related to weakening effect of the opening and inhibition effect of confining pressure in essence: when weakening effect of the opening is greater than inhibition effect of confining pressure, the failure surface is parallel to the x axis(such as σ2=σ3=0 MPa); conversely, the failure surface is parallel to the z axis(such as σ2=20 MPa, σ3=0 MPa).
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/145153]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang SR,Sun B,Wang C,et al. Influence of intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening[J],2016, 2016.
APA	张社荣.,孙博.,王超.,严磊.,ZHANG She-rong.,...&YAN Lei.(2016).Influence of intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening..
MLA	张社荣,et al."Influence of intermediate principal stress on failure mechanism of hard rock with a pre-existing circular opening".(2016).

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