Experimental Study on Residual Deformation of Coal Gangue Filler under Multi-vibration Cyclic Loading

Abstract The use of coal gangue as roadbed filler can alleviate environmental problems and reduce environmental pollution. In this paper, the multi-vibration cyclic loading test of coal gangue roadbed filling body considering different confining pressure, compactness and gradation parameters is carried out. The deformation characteristics were studied, the residual deformation model was established, and the influence of different factors on the residual deformation value was discussed. The results show that under the cyclic loading of multiple vibration times, the deformation growth rate of coal gangue filler begins to increase, then slows down and tends to be constant. The actual residual deformation of coal gangue filler is not an accurate logarithmic relationship with the number of earthquakes. The shear and volumetric residual strains of 0 ~ 200 earthquakes have a quadratic function relation with logarithmic earthquake number lg (1 + N). There is a logarithmic relationship between the volume residual strain and the logarithmic number lg (1 + N) in 201 ~ 10000 earthquakes. All the influencing factors have a certain influence on the residual deformation value of the coal gangue specimen. According to the grey correlation degree calculation, the influence degree of the influencing factors of the coal gangue filler is ranked as the number of earthquakes, confining pressure, compaction degree and gradation. In addition, according to the grey correlation analysis, the influence of soil particle tumbling on the residual deformation is greater than the influence of soil particle crushing.