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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摘要开展冻融–周期荷载下裂隙岩体损伤及断裂演化规律分析，首先通过对0°，45°，90°的单裂隙类砂岩试样开展0，10，20，30次冻融循环；而后对不同冻融次数后的试样进行每级10次加卸载试验，进而关注冻融–周期荷载联合作用下裂隙岩体损伤特征及端部断裂。取得的成果如下：(1) 裂隙岩体在冻融–周期荷载联合作用下，其损伤特征与裂隙发育形态、冻融次数、周期荷载作用方式均存在关联，其中，冻融次数与周期荷载存在典型叠加效应；(2) 因冻融作用的参与，疲劳破坏强度与裂隙倾角呈现正比关系，该规律明显有别于未冻融加卸载试验结论；(3) 随着周期荷载强度提升，裂隙岩体回滞环形态趋于饱满，并依据裂隙倾角差异出现不同迁移方向；此外，回滞环饱满程度呈现“中央小于首尾”典型特征；(4) 基于渐进损伤区“缺陷面积”表征累积性损伤，可较好体现冻融–周期荷载作用下裂隙端部三阶段局部化疲劳损伤效应。研究成果对不同形式周期荷载作用下裂隙岩体损伤及断裂演化认知具有一定参考价值。

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	申艳军1
	杨更社1
	王铭1
	贾海梁1
	张慧梅2
	高喜才3

关键词 ：岩石力学, 冻融循环, 周期荷载, 单裂隙类砂岩, 累积性损伤, 端部断裂演化

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

引用本文:

申艳军1，杨更社1，王铭1，贾海梁1，张慧梅2，高喜才3. 冻融–周期荷载下单裂隙类砂岩损伤及断裂演化试验分析[J]. 岩石力学与工程学报, 2018, 37(3): 709-717.
SHEN Yanjun1，YANG Gengshe1，WANG Ming1，JIA Hailiang1，ZHANG Huimei2，GAO Xicai3. Experiments on the damage characteristics and fracture process of single-joint quasi-sandstone under the cyclic freezing-thawing and cyclic loading. , 2018, 37(3): 709-717.

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

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