冻融循环作用下砂岩三点弯曲断裂性能试验及其破坏形态研究

doi:10.13722/j.cnki.jrme.2017.0778

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Abstract Three-point bending test on sandstone with different initial crack-depth ratios was carried out under different freezing-thawing cycles. The variation of the three-dimensional shape of the failure surface of specimens under the cyclic freezing-thawing was analyzed，and the relationships between the roughness coefficient and the initial load of fracture，peak load，fracture toughness and fracture energy were explored. The results show that the cyclic freezing-thawing reduces the values of initial load of fracture，peak load，fracture toughness and fracture energy of sandstone specimens to various extent and the extent of reduction is affected by the initial crack-depth ratio. The roughness coefficient of the failure surface of specimens increase with increasing freezing-thawing cycles and initial crack-depth ratio. When the initial crack-depth ratio is fixed，the relationship between the roughness coefficient and the freeze-thaw cycles is an exponential function. Under the effect of cyclic freezing-thawing，the damage factors of the peak load and the fracture toughness increase linearly with the increment of roughness coefficient.

Key words： rock mechanics sandstone freeze-thaw cycle three-point bending fracture roughness coefficient

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	HE Jingjing
	SHI Junping

Cite this article:

HE Jingjing,SHI Junping. Fracturing behavior and failure pattern of sandstone in three-point bending test under freezing-thawing cycles[J]. , 2017, 36(12): 2917-2925.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0778 OR http://www.rockmech.org/EN/Y2017/V36/I12/2917

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