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DOI	10.1016/j.coldregions.2023.104013
	Evolution characteristics of freeze-thaw-induced sandstone damage under water immersion conditions in Changdu, Tibet, China
	Ju, Xin; Niu, Fujun; Liu, Minghao; Luo, Jing
发表日期	2024
ISSN	0165-232X
EISSN	1872-7441
卷号	217
英文摘要	Freeze-thaw (F-T) weathering of rocks can degrade macroscopic properties through changes in the pore structure, which may have effects on the triggering mechanism of geological hazards in cold regions. In this study, sandstone specimens of 50 mm diameter and 205 mm height were subjected to immersion and F-t-tests, computed tomography (CT) scanning, and uniaxial compression tests. The CT slice areal porosity was used to divide the bottom portion of specimens into a non-immersed part, water migration transition region, and submerged part. The pore-throat networks of these parts were established, and the distribution characteristics of the pores were investigated. The results showed that sandstone weathering can lead to the deterioration of uniaxial compressive strength, accompanied by a change in pore structure. Specifically, distribution of the specimens' areal porosity changed dramatically along the axial direction under the F-T cycles, however, the heterogeneity coefficient of the submerged part changed slightly. The equivalent radius of dominant pores in the non-immersed part was primarily concentrated within 100 mu m, while the counterparts of the transition region and submerged part trend towards 200-400 mu m under F-T cycles, with a proportion of these pores showing a 3.2- to 6.4-fold increase. The uniaxial compressive strength of the bottom portion of the specimen infiltrated by water gradually decreased as the F-T cycles progressed. The absolute permeability simulation demonstrated that the permeability of the specimens gradually increased as the number of F-T cycles increased. In this particular case, it was assumed that the region far away from the submerged part with lower water content first froze and blocked the pathway of water migration, profitably affecting the F-T deterioration. The conclusions summarised herein will benefit descriptions of the effect of freeze-thaw action under immersion conditions to guide the prevention of geological engineering disasters in cold regions.
关键词	Water immersion Freeze-thaw cycles Pore network model Areal porosity Damage evolution Permeability
英文关键词	MECHANICAL-PROPERTIES DEGRADATION; GRANITE; CYCLES
WOS研究方向	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:001084140800001
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283452
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; South China University of Technology
推荐引用方式 GB/T 7714	Ju, Xin,Niu, Fujun,Liu, Minghao,et al. Evolution characteristics of freeze-thaw-induced sandstone damage under water immersion conditions in Changdu, Tibet, China[J],2024,217.
APA	Ju, Xin,Niu, Fujun,Liu, Minghao,&Luo, Jing.(2024).Evolution characteristics of freeze-thaw-induced sandstone damage under water immersion conditions in Changdu, Tibet, China.COLD REGIONS SCIENCE AND TECHNOLOGY,217.
MLA	Ju, Xin,et al."Evolution characteristics of freeze-thaw-induced sandstone damage under water immersion conditions in Changdu, Tibet, China".COLD REGIONS SCIENCE AND TECHNOLOGY 217(2024).