Experimental study on the three-dimensional expansion patterns of frost heave in artificially frozen cross passage
In addressing the safety challenges of structure due to artificial freezing induced frost heave in permafrost cross passage,a similar simulation experiment was conducted to investigate the three-dimensional frost heave characteristics of frozen soil during the artificial freezing process.The follow-ing conclusions were drawn as ① Frost heave induced significant deformation in the overlying soil lay-ers at 20,40 and 60 mm depths beneath the surface,exhibiting a trend of larger deformation at the upper part of the freezing wall and smaller deformation at the boundary positions,with surface uplift following a Gaussian distribution pattern;② The deformation of the structure could be roughly cate-gorized into three stages:small deformation,large deformation,and small deformation;③ The radial expansion volume of the freezing wall was in a ratio of 15∶1 compared to the axial expansion volume,while the radial expansion thickness was in a ratio of 1.1∶1 compared to the axial expansion thickness.The research results offered preliminary insights into the three-dimensional expansion pat-terns of artificially frozen soil.
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