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| DAMAGE EVOLUTION MODEL OF SATURATED SANDSTONE
UNDER FREEZE-THAW CYCLES |
| JIA Hailiang1，LIU Qingbing2，XIANG Wei1，2，ZHANG Weili1，LANG Linzhi1 |
| (1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430071，China；2. Three Gorges Research Center for Geo-hazard，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430071，China) |
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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.
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Received: 14 June 2012
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2013, Vol. 32 
