|Table of Contents|

Research on damage characteristics of freeze-thawed red sandstone based on uniaxial compression and SEM experiments(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
153-162
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on damage characteristics of freeze-thawed red sandstone based on uniaxial compression and SEM experiments
Author(s):
ZHANG Na1; 2;  ZHAO Weizheng1; 2;  LUO Shuiliang1; 2;  WANG Shuaidong1; 2;  WANG Ruochen1; 2;  LI Xianliang2
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)
Keywords:
red sandstone;  freeze-thaw cycle;  mechanical property;  pore structure characteristic
PACS:
TU458
DOI:
10.19815/j.jace.2022.04082
Abstract:
In order to study the effect of freeze-thaw cycles on mechanical properties and microstructure of rock, saturated red sandstone samples were taken as the research object, and freeze-thaw cycle experiments with different number of freeze-thaw cycles(0,5,10,15,20,30)were carried out. The variation of mechanical properties of red sandstone samples under freeze-thaw cycles was analyzed through uniaxial compression test. Through scanning electron microscopy(SEM)experiment, and with the help of Image-Pro Plus image analysis software, the changes of microscopic pore structure of damaged rock under different freezing and thawing cycles were quantitatively characterized. Finally, the damage degradation characteristics of freeze-thaw cycle red sandstone were quantitatively analyzed based on rock damage theory. The results show that the mass change rate of red sandstone samples increases first and then decreases during the whole freeze-thaw cycle. With the increase of freeze-thaw cycles, the uniaxial compressive strength, elastic modulus, and Poisson's ratio decrease gradually. Under the action of the freeze-thaw cycle, the particles on the surface of red sandstone sample are exfoliated and the degree of cementation is reduced. The pores between particles gradually increase, and the micro-cracks germinate, expand and connect. In addition, as the number of cycles increases, the pore structure becomes more uniform, showing that the fractal dimension decreases gradually with the increase of freeze-thaw cycles. The red sandstone in the test has poor frost resistance, and the frost resistance coefficient and freeze-thaw damage degree change significantly with the number of freeze-thaw cycles. Both can be fitted by the exponential function. This study has a certain reference value for measuring the macro and micro characteristics of sandstone in cold area engineering construction.

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Last Update: 2023-07-01