冻融–周期荷载下单裂隙类砂岩损伤及断裂演化试验分析

doi:10.13722/j.cnki.jrme.2017.1296

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Abstract The damage and fracturing of fractured rock mass under freezing-thawing and cyclic loading were studied. The quasi-sandstone specimens with a single joint of 0°，45° and 90° were prepared and tested under 0，10，20，30 cycles of freezing-thawing. The damage characteristics and fracturing features of quasi-sandstones with a single fracture under the combined effects of freezing-thawing and cyclic loading were discussed. The damage characteristics of the fractured rocks are related to the fracture morphology，the number of freezing-thawing cycles and the cyclic loading mode. There exist the typical coupling effects between the number of freeze-thaw cycles and the cyclic loading processes. The failure strength is directly proportional to the crack angle after the cyclic freezing-thawing，which is much different from the cyclic loading test without the effect of freezing-thawing. With the increase of cyclic loading level，the hysteresis ring tends to be full，and the migration pattern is presented due to the differences of the crack angles. In addition，the degree of fullness of the hysteresis loops located in the center are less than the ones located in the boundaries. The expression of defect area can reflect accurately the localized damage at fracture tips under the combined effects of freezing-thawing and cyclic loading.

Key words： rock mechanics freeze-thaw cycles cyclic loading single-joint quasi-sandstone accumulated damage tip fracture development

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	Articles by authors
	SHEN Yanjun1
	YANG Gengshe1
	WANG Ming1
	JIA Hailiang1
	ZHANG Huimei2
	GAO Xicai3

Cite this article:

SHEN Yanjun1,YANG Gengshe1,WANG Ming1, et al. Experiments on the damage characteristics and fracture process of single-joint quasi-sandstone under the cyclic freezing-thawing and cyclic loading[J]. , 2018, 37(3): 709-717.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1296 OR http://www.rockmech.org/EN/Y2018/V37/I3/709

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