冻融循环作用下单裂隙类砂岩局部化损伤效应及端部断裂特性分析

doi:10.13722/j.cnki.jrme.2016.0122

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Abstract Saturated fractured rocks in cold regions under cyclic freezing and thawing experience the crack initiation，crack extension，deflection and branching along the crack end，which results in localized damage and fracturing at the crack end and overall failure. The quasi-sandstone samples of similar materials containing a single fracture with the inclination angles of 0°，30°，45°，60°，90°，were prepared. The freezing and thawing cycles of 10，20，30，50 were applied in the experiments respectively. The samples with a single fracture exhibit the localized damage under the cyclic freezing and thawing and the fracture end can be divided into fracture zone，progressive damage zone and systematic damage zone. The localized damage effect becomes weaker and the acoustic wave velocity becomes faster as the increase of the crack dip angle. The bifurcation and deflection of main cracks under cyclic freezing and thawing occur in the samples with a single fracture at the inclination angles of 30°，45° and 60°. The deflection of main crack occurs earlier，the deflection direction tends to be horizontal，and the extended length along the initial fracture direction is shorter as the decrease of the crack tip angle. The localized damages in the upper and lower of crack are different and the macroscopic fracture occurs earlier at the bottom of the crack，and the difference is more notable with the increase of the crack dip angle.

Key words： rock mechanics freeze-thaw cycles single-fractured rock masses localized damage effect principle of stress superimposition

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	Articles by authors
	SHEN Yanjun1
	YANG Gengshe1
	RONG Tenglong2
	JIA Hailiang1
	WANG Ming1
	LIU Hui1

Cite this article:

SHEN Yanjun1,YANG Gengshe1,RONG Tenglong2, et al. Localized damage effects of quasi-sandstone with single fracture and fracture behaviors of joint end under cyclic freezing and thawing[J]. , 2017, 36(3): 562-570.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.0122 OR http://www.rockmech.org/EN/Y2017/V36/I3/562

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