Numerical simulation research on the micro failure mechanism of sandstone under freeze-thaw cycles

Numerical simulation research on the micro failure mechanism of sandstone under freeze-thaw cycles

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The process of micro crack formation in sandstone subjected to freeze-thaw cycles is pivotal for strip mine in cold regions.A discrete element numerical model considering the variation of frost heave force and water saturation during the freeze-thaw cycles is established by PFC3D in this paper.The results indicate that: (1) During freeze-thaw cycles, the development of cracks can be divided into three stages: stable, growth and explosive stage.The crack quantity in the stable and HAIR ACCESSORIES growth stage increases exponentially, while the quantity of cracks in the explosive stage increases linearly quickly.

(2) Repeated freeze-thaws cause progressive damage to rocks from surface to interior.As the times of freeze-thaw increase, cracks gradually develop, and their distribution becomes more uniform on different angles.(3) Sandstone that have undergone freeze-thaw cycles is more prone to tensile failure, and the distribution of cracks becomes even more complex.These research findings provide a more accurate understanding In Ground Product (Filters) of micro-fracture mechanisms in rocks in the freeze-thaw condition.