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Dr. Guofeng Liu
School of highway, Chang’an University, Xi’an 710064, China

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Research Keywords & Expertise

0 Microseismic Monitoring
0 Numerical simulation of geotechnical engineering
0 Rock mechanics test
0 Risk assessment and management of rockburst hazard
0 In-situ observation of rock spalling

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Original paper
Published: 27 May 2021 in Rock Mechanics and Rock Engineering
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Volumetric expansion of water by 9% in saturated pores and cracks causes substantial frost deformation in rock masses. Frost deformation is an important index reflecting the frost resistance of rocks; however, water saturation has a great influence on the frost deformation characteristics. In this research, the frost strains and acoustic emission activities of red sandstone with different water saturations are monitored under freeze–thaw conditions. The experimental results show that both the peak and the residual frost heaving strains greatly increase for sandstone beyond 85% water saturation. However, there is no significant frost heaving strain that occurs in low-saturation red sandstone (less than 85% water saturation). The acoustic emission activities show the same change trend and further confirm the existence of this critical saturation. In addition, the pore size distribution also has a great influence on the frost heaving strain and freeze–thaw damage. All the liquid pore water in this red sandstone is frozen at − 20 °C because the pores are larger than the critical freezing radius (2.58 nm at − 20 °C) according to the measured pore size distribution. Based on the pore micromechanics and Gibbs–Thomson equation, a developed frost heaving model is proposed considering the effects of water saturation and the pore size distribution. The proposed model can be used to predict the frost heaving strain at any freezing temperature for unsaturated red sandstone. This study thus provides the frost deformation characteristics of red sandstone and contributes to a better understanding of the freeze–thaw damage mechanism of unsaturated sandstone.

ACS Style

Shibing Huang; Yuantian Cai; Yanzhang Liu; Guofeng Liu. Experimental and Theoretical Study on Frost Deformation and Damage of Red Sandstones with Different Water Contents. Rock Mechanics and Rock Engineering 2021, 1 -19.

AMA Style

Shibing Huang, Yuantian Cai, Yanzhang Liu, Guofeng Liu. Experimental and Theoretical Study on Frost Deformation and Damage of Red Sandstones with Different Water Contents. Rock Mechanics and Rock Engineering. 2021; ():1-19.

Chicago/Turabian Style

Shibing Huang; Yuantian Cai; Yanzhang Liu; Guofeng Liu. 2021. "Experimental and Theoretical Study on Frost Deformation and Damage of Red Sandstones with Different Water Contents." Rock Mechanics and Rock Engineering , no. : 1-19.

Original paper
Published: 03 November 2020 in Bulletin of Engineering Geology and the Environment
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The presence of water has a great influence on the strength and deformation of clay-bearing sandstone. Most of the natural rocks suffer water softening of different saturations. In this study, due to the importance of the clay-bearing rocks in geoengineering practice, red sandstone was chosen to investigate the effect of water contents on the UCS (uniaxial compressive strength), TCS (triaxial compressive strength), BTS (Brazilian tensile strength), PLS (point load strength), and DSS (direct shear strength). The UCS and TCS are linearly decreased as the water saturation increases. When the water saturation increases from 0 to 100%, the UCS and TCS have decreased by about 52.8% and 29.3%, respectively. The BTS, PLS, and DSS are exponentially decreased with increasing water saturation, which have a reduction of about 45.5%, 66.3%, and 49%, respectively. Four typical deformation stages are observed during compression for this red sandstone samples, including an obvious compaction stage. The water saturation does not have any effect on the ratio of the strain on the transition points of these stages to the peak strain, as well as the stress. Besides, a rapid increase of the AE count occurs at the plastic yield point although the cumulative AE count has an obvious decrease trend with increasing the water saturation. Then, considering the effect of water saturation, a complete constitutive model has been proposed to well predict the stress-strain relationship of the red sandstone. The water’s weakening effect on the clay-bearing red sandstone has also been deeply discussed and developed.

ACS Style

Shibing Huang; Yingbo He; Guofeng Liu; Zexin Lu; Zekun Xin. Effect of water content on the mechanical properties and deformation characteristics of the clay-bearing red sandstone. Bulletin of Engineering Geology and the Environment 2020, 80, 1767 -1790.

AMA Style

Shibing Huang, Yingbo He, Guofeng Liu, Zexin Lu, Zekun Xin. Effect of water content on the mechanical properties and deformation characteristics of the clay-bearing red sandstone. Bulletin of Engineering Geology and the Environment. 2020; 80 (2):1767-1790.

Chicago/Turabian Style

Shibing Huang; Yingbo He; Guofeng Liu; Zexin Lu; Zekun Xin. 2020. "Effect of water content on the mechanical properties and deformation characteristics of the clay-bearing red sandstone." Bulletin of Engineering Geology and the Environment 80, no. 2: 1767-1790.