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Dynamic compression properties of a saturated white sandstone under ambient sub-zero temperatures
The dynamic compression properties of frozen rocks are essential for a better design of underground rock engineering infrastructures in cold regions. Thus, a dynamic-cryogenic testing system was adopted to conduct dynamic compression tests under ambient sub-zero temperatures in a highly controlled manner. Fully saturated cylindrical specimens made of a porous white sandstone (WS) are tested under different ambient temperatures (20 °C, − 5 °C, − 10 °C, − 20 °C, and − 30 °C). For comparison, dry specimens and dried specimens after one freeze–thaw (1FT) action are also tested at the same ambient sub-zero temperatures. The results show that the dynamic uniaxial compressive strength (DUCS) for three sets of specimens all shows the apparent rate dependency. DUCSs for dry and dry after 1FT specimens show a similar trend, revealing that one FT causes negligible deterioration to the dynamic strength of WS. At a given loading rate, the DUCS of the frozen saturated specimens first increases when the ambient testing temperature ranges from room temperature to − 5 °C. It then drops to the lowest value at − 10 °C before further increasing with the dropping ambient testing temperature. This tread can be understood by the interaction between the rock matrix and the unfrozen water and ice mixture enclosed in rock pores. The NMR signals, P-wave velocity, and failure patterns are combined to interpret the weakening and enhancing mechanisms of the unfrozen water and ice mixture on the DUCS of WS. Among these mechanisms, the impact melting mechanism newly proposed in this work is responsible for the lower DUCS of saturated specimens compared with dry ones. Such trends, along with the underlying mechanism, are unique to the dynamic compressive response of porous rocks under sub-zero ambient temperatures.
Dynamic compression properties of a saturated white sandstone under ambient sub-zero temperatures
The dynamic compression properties of frozen rocks are essential for a better design of underground rock engineering infrastructures in cold regions. Thus, a dynamic-cryogenic testing system was adopted to conduct dynamic compression tests under ambient sub-zero temperatures in a highly controlled manner. Fully saturated cylindrical specimens made of a porous white sandstone (WS) are tested under different ambient temperatures (20 °C, − 5 °C, − 10 °C, − 20 °C, and − 30 °C). For comparison, dry specimens and dried specimens after one freeze–thaw (1FT) action are also tested at the same ambient sub-zero temperatures. The results show that the dynamic uniaxial compressive strength (DUCS) for three sets of specimens all shows the apparent rate dependency. DUCSs for dry and dry after 1FT specimens show a similar trend, revealing that one FT causes negligible deterioration to the dynamic strength of WS. At a given loading rate, the DUCS of the frozen saturated specimens first increases when the ambient testing temperature ranges from room temperature to − 5 °C. It then drops to the lowest value at − 10 °C before further increasing with the dropping ambient testing temperature. This tread can be understood by the interaction between the rock matrix and the unfrozen water and ice mixture enclosed in rock pores. The NMR signals, P-wave velocity, and failure patterns are combined to interpret the weakening and enhancing mechanisms of the unfrozen water and ice mixture on the DUCS of WS. Among these mechanisms, the impact melting mechanism newly proposed in this work is responsible for the lower DUCS of saturated specimens compared with dry ones. Such trends, along with the underlying mechanism, are unique to the dynamic compressive response of porous rocks under sub-zero ambient temperatures.
Dynamic compression properties of a saturated white sandstone under ambient sub-zero temperatures
Acta Geotech.
Xu, Ying (author) / Fu, Yan (author) / Yang, Yuxin (author) / Yao, Wei (author) / Xia, Kaiwen (author) / Peng, Jianbing (author)
Acta Geotechnica ; 18 ; 4245-4260
2023-08-01
16 pages
Article (Journal)
Electronic Resource
English
Dynamic uniaxial compressive strength (DUCS) , Frost heave damage , Impact melting , Sub-zero ambient temperature , White sandstone (WS) Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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