多孔岩石冻融水分迁移损伤机制及试验验证

doi:10.13722/j.cnki.jrme.2019.1234

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Abstract In order to study the freeze-thaw damage of porous rock caused by moisture migration inside the pores (cracks) during the freeze-thaw process，the pressure-suction equilibrium state of the film water was analyzed，and it was found that the main role of the liquid pressure is to offset and balance the net suction. The conversion coefficient λ between the pressure variable and the suction variable was given，and it was pointed out that the surface adsorption force comes from the difference between the net suction force and the offset factor λPLy. Based on the capillary theory，the freezing temperature equation of pore water was derived，and the stress state of film water in the frozen large pores was given. Besides，for the “main-side branch” pore structure with poor frost resistance，a capillary-film moisture migration unit model was established，and the stress distribution，migration direction and migration path of the characteristic pores were given. The research results show that the net suction and liquid pressure of the film water inside the frozen main pores are the largest. The net suction force drives the capillary water and film water in the secondary pores and micro-pores to migrate to the main pores，while the increase of the liquid pressure leads to the crack expansion and structural damage of the main pores. Finally，Taking the Jurassic-Cretaceous silty soft rock as the test object，particle analysis，scanning electron microscopy and low field-nuclear magnetic resonance tests were carried out to analyze the mineral composition，pore structure and pore distribution of siltstone，and the correctness of the capillary-film moisture migration unit model was verified according to the change characteristics of T2 spectrum during the freeze-thaw process.

Key words： rock mechanics pressure-suction equilibrium conversion coefficient water migration freeze-thaw damage

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	Articles by authors
	CHENG Hua1
	2
	CHEN Hanqing1
	CAO Guangyong3
	4
	RONG Chuanxin2
	YAO Zhishu2
	CAI Haibing2

Cite this article:

CHENG Hua1,2,CHEN Hanqing1, et al. Damage mechanism of porous rock caused by moisture migration during freeze-thaw process and experimental verification#br#[J]. , 2020, 39(9): 1739-1749.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1234 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I9/1739

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