Abstract
The integrity of the rock continues to decrease with the number of freeze-thaw cycles increases. This paper takes the coarse and fine sandstone collected from the Muli coal mine slope in Qinghai, northwest China, as the research object. Physical and mechanical properties of the rocks before and after freeze-thaw cycling are measured. Based on the decay equation suggested by the previous studies, the decay laws of rock integrity are analyzed by taking the uniaxial compressive strength (UCS) as the integrity index. It is found that the decay index λ is not a constant as generally recognized previously, but it keeps changing with the number of freeze-thaw cycles increases. At the same time, there are some differences in the changing laws of λ in different rocks. Finally, a relationship is established for the decay index and the velocity of longitudinal wave in the fine sandstones.
Published Version
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