Abstract：Research purposes: The characteristics of filler under long-term railway load are analyzed from three aspects: atmospheric influence depth, dynamic stress influence depth and settlement influence depth. The indoor model test of static and dynamic bearing capacity of typical subgrade bed filler is established, and the deformation characteristics of filler under cyclic load are analyzed. Through a large number of on-site light dynamic penetration, heavy dynamic penetration, drilling, excavation and other means, the characteristic law of the filler after 110 years of cyclic load is verified, and the state of the existing line foundation filler without obvious diseases is analyzed and evaluated. Research conclusions: (1) After long-term load, the upper part of the subgrade forms a hard shell layer whose compactness is significantly higher than that of the lower soil. (2) The thickness of hard shell layer is the subgrade thickness corresponding to the attenuation of plastic strain along the depth of 20%. (3) The bearing capacity of hard shell increases with time. (4) The better the filler, the higher the bearing capacity of the hard shell layer. (5) The average bearing capacity of the hard shell layer is generally 1.1～1.3 times that of the underlying layer, and the lower the bearing capacity of the underlying layer, the greater the ratio of the bearing capacity of the hard shell layer to the underlying layer, and vice versa. (6) The research results can provide theoretical basis and data support for speed increase and reconstruction of existing lines.
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2022, Vol. 39 
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