砂岩冻融损伤机制的理论分析和试验验证

doi:10.13722/j.cnki.jrme.2015.1300

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Abstract Due to the complexity of rock properties and the variability of environmental conditions，frost damage of rock can hardly be attributed to one single mechanism. Nonetheless，in most of the cases，one or more mechanisms dominate the process. We firstly reviewed the existing theories on frost damage and compare their applicable conditions. Afterwards the controlling role of the pore structure of sandstone(as an example of porous rock) in the frost damage process was discussed，and the “representative element of frost damage” was defined. The probable damage mechanisms and the predominant mechanism of sandstone under different freezing patterns were identified according to the thermodynamics. Under the low freezing rate，the capillary and crystallization pressure were found to play a key role in damaging sandstone，while the volumetric expansion process was restrained. While under the high freezing rate，the volumetric expansion process and hydraulic pressure process contributed predominately to the damage of sandstone rather than the capillary and crystallization pressure. To test the above findings，a series of experiments on frost damage of sandstone were conducted，including the direct observation of the microstructure of sandstone under environmental scanning electron microscope(ESEM) and monitoring of the frost deformation of sandstone using strain gages. The experimental results are consistent with the theoretical analysis.

Key words： rock mechanics mechanism of frost damage frost damage of sandstone pore structure thermodynamic theory microscopic observation of frost damage frost deformation monitoring

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	Articles by authors
	JIA Hailiang1
	XIANG Wei1
	TAN Long1
	ZHANG Weili1
	ZENG Wen2
	CAO Shen1
	CHENG Chaojie1

Cite this article:

JIA Hailiang1,XIANG Wei1,TAN Long1, et al. Theoretical analysis and experimental verifications of frost damage mechanism of sandstone[J]. , 2016, 35(5): 879-895.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1300 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I5/879

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