Strength and Microscopic Damage Mechanism of Yellow Sandstone with Holes under Freezing and Thawing
| Autor: | Hong Liu, Dong Hao, Rong Huren, Zhang Jiayao, Rong Miren, Gu Jingyu |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Pore size
Materials science Article Subject 0211 other engineering and technologies Uniaxial compression 02 engineering and technology Microstructure Engineering (General). Civil engineering (General) 020303 mechanical engineering & transports 0203 mechanical engineering Specific surface area Stereo microscope Servo press Composite material TA1-2040 Elastic modulus 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | Advances in Civil Engineering, Vol 2020 (2020) |
| ISSN: | 1687-8094 1687-8086 |
| Popis: | In order to study the damage characteristics of the yellow sandstone containing pores under the freeze-thaw cycle, the uniaxial compression test of saturated water-stained yellow sandstones with different freeze-thaw cycles was carried out by rock servo press, the microstructure was qualitatively analyzed by Zeiss 508 stereo microscope, and the microdamage mechanism was quantitatively studied by using specific surface area and pore size analyzer. The mechanism of weakening mechanical properties of single-hole yellow sandstone was expounded from the perspective of microstructure. The results show the following. (1) The number of freeze-thaw cycles and single-pore diameter have significant effects on the strength and elastic modulus of the yellow sandstone; the more the freeze-thaw cycles and the larger the pore size, the lower the strength of the yellow sandstone. (2) The damage modes of the yellow sandstone containing pores under the freeze-thaw cycle are divided into five types, and the yellow sandstone with pores is divided into two areas: the periphery of the hole and the distance from the hole; as the number of freeze-thaw cycles increases, different regions show different microscopic damage patterns. (3) The damage degree of yellow sandstone is different with freeze-thaw cycle and pore size. Freeze-thaw not only affects the mechanical properties of yellow sandstone but also accelerates the damage process of pores. (4) The damage of the yellow sandstone by freeze-thaw is logarithmic function, and the damage of the yellow sandstone is a power function. The damage equation of the yellow sandstone with pores under the freezing and thawing is a log-power function nonlinear change law and presents a good correlation. |
| Databáze: | OpenAIRE |
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