露天煤矿冻岩边坡饱和砂岩冻融损伤试验与劣化模型研究

doi:10.13722/j.cnki.jrme.2016.0945

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Abstract The slopes of open-pit mine are always in freezing- thawing environment in permafrost region，and the surface rock of slopes is weathering during the freezing- thawing cycles. The cyclic freezing-thawing tests on the saturated sandstone from the mining area in Muli were completed in laboratory in order to understand the physical and mechanical characteristics of saturated rock in freezing-thawing cycles. The degradation model for the saturated rock was studied. The micro-fracture rate increases gradually with increasing the freezing-thawing cycles，but the uniaxial and triaxial compression strengthes and other physical parameters decreases with the number of the freezing-thawing cycles. The micro-fracture propagation factor was suggested according to the micro-fracture change in the freezing-thawing cycles. The theoretical damage model and constitutive relations of rock strength were established using the micro-fracture propagation factor. The proposed model explained quantitatively the damage of the saturated rock due to freezing-thawing. The theoretical strength calculated with the damage model matched well with the test results. The composite stress generated due to water transformation to ice exceeded the strength of rock and drove the micro- fracture to expand.

Key words： rock mechanics freezing-thawing cycles saturated rock micro-fracture propagation factor damage model

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	Articles by authors
	XU Shuanhai1
	2
	3
	LI Ning1
	3
	4
	WANG Xiaodong2
	3
	XU Ganggang2
	YUAN Kekuo2
	TIAN Yanzhe2
	WANG Liping1

Cite this article:

XU Shuanhai1,2,3, et al. Damage test and degradation model of saturated sandstone due to cyclic freezing and thawing of rock slopes of open-pit coal mine[J]. , 2016, 35(12): 2561-2571.

URL:

http://rockmech.org/EN/10.13722/j.cnki.jrme.2016.0945 OR http://rockmech.org/EN/Y2016/V35/I12/2561

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