Abstract
This paper studies the change of physical and mechanical properties of sandstone after freeze-thaw (F-T) cycle treatment. Firstly, the effects of the freeze-thaw treatment on the P-wave velocity of sandstone specimens are analyzed. It is found that the P-wave velocity decreases with the increase of the number of freeze-thaw cycles. Secondly, the effect of freeze-thaw treatment on the mechanical properties of sandstone is analyzed. The results show that the tensile strength and compressive strength of sandstone samples decrease with the increase of the number of freeze-thaw cycles. Finally, the digital image correlation (DIC) technique was used to collect the full-field deformation data of the samples, and the influence of freeze-thaw cycles on the deformation characteristics and fracture process of sandstone was analyzed. Based on the standard deviation of the principal strain in the field deformation data, the damage variables were proposed to characterize the damage process of sandstone samples in the Brazilian splitting test and the uniaxial compression test. The results show that the proposed damage variables can reflect the damage evolution process of the sample effectively. According to the variation of damage variables, the damage evolution process of sandstone specimens during the Brazilian splitting test and the uniaxial compression test can be divided into three stages: slow or negative growth stage, stable growth stage, and rapid growth stage. The research results are of great significance for predicting the failure mode and damage evolution of rock mass engineering by using digital image correlation technology.
Highlights
In China, cold regions account for 75.8% of the total land area [1]
The study of mechanical properties and the damage evolution process of rock mass in cold regions is an important issue for practical applications
For the uniaxial compression test, due to the influence of the end effect, the localization strain band is always generated from one end and gradually widens and moves to the other end of the sample, forming an oblique or vertical localization strain band in the middle of the sample
Summary
In China, cold regions account for 75.8% of the total land area [1]. In cold areas, ambient temperatures above or below the freezing point can trigger freeze-thaw cycles. The damage and deterioration of rock mass caused by freezing and thawing have caused a series of geological engineering problems, such as frost heave cracking of tunnel linings [2], deformation of high-speed railway subgrades [3], weathering and denudation of rock slope [4], and instability of high and steep dangerous rock mass [5]. It is of great significance for engineering construction in cold areas to study the damaged mechanical properties of rock specimens after freezethaw treatment under load conditions. Khanlari and Abdilor [12] studied the influence
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