In the development of underground projects in cold areas, the surrounding rock mass is in an environment with low temperature for a long time, and its internal free water freezes, which significantly affects the mechanical properties of the surrounding rock mass. At the same time, the underground projects will be subjected to earthquake, blasting and other dynamic loads, resulting in instability failure. However, current study on the dynamic compressive properties of frozen rock is insufficient. In order to explore the compression characteristics of frozen rock under dynamic load, the dynamic compression tests of red sandstone were carried out by using split Hopkinson pressure bar. The effect of temperature and water content on dynamic compression properties of red sandstone was analyzed, and the relationship between the degree of fragmentation and energy dissipation was revealed. The results show that: (1) The dynamic compressive strength, strain and elastic modulus of frozen red sandstone present a significant effect of temperature and strain rate. With the water content increases, the dynamic compressive strength and dynamic elastic modulus increase, while the dynamic peak strain decreases. (2) The dissipated energy of frozen red sandstone increases with the decrease of temperature and the increase of strain rate, and decreases with the increase of water content. (3) The degree of fragmentation and fractal dimension of frozen red sandstone are closely related to temperature, water content and strain rate. With the decrease of temperature or the increase of strain rate, the degree of fragmentation and fractal dimension of frozen red sandstone increase. With the water content increases, the degree of fragmentation and fractal dimension of low temperature frozen red sandstone decrease. (4) In addition, the fractal dimension of rock increases with the increase of dissipated energy density. The findings of this study provide guidance for the construction and protection of civil, hydraulic, tunnel, and other engineering projects in cold regions, which have significant engineering value.
Liu Hongwei
,
Zhao Xiaoling
,
Sun Jiaxin
,
Li Rui
,
Bao Weiyue
. Study on the Dynamic Mechanical Behavior of Freezing Sandstone under Dynamic Compression Loading[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 643
-650
.
DOI: 10.20174/j.JUSE.2025.S2.13
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