冻融循环作用下饱和砂岩损伤扩展模型研究

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Abstract Freeze-thaw cycles applying to saturated sandstone are considered as a kind of low frequency fatigue load after the analysis of its features. And the stress condition of sandstone under freeze-thaw cycles can be simplified to cycles of uniaxial tension. According to the above analysis，damage evolution equation is established based on the fatigue damage theory. Then，the open porosity of sandstone which has been tested during the freeze-thaw experiment is selected as the damage variable. After that，the new damage evolution model is tested and verified by the comparison between experiment data and theoretical value，and how to get the values of parameters in the equation is also discussed. The new model is proved to be able to describe the basic damage evolution law of sandstone，this could be the reference for similar researches.

Key words： rock mechanics saturated sandstone freeze-thaw cycles damage evolution model open porosity

Received: 14 June 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3049

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