Mechanical Response and Deformation Characteristics of Separated Subgrade Slope under Traffic Load
The paper analyzes the stress and deformation characteristics of high embankment slopes in separate roadbeds under the action of repeated traffic load cycles.FLAC3DA is used to establish a numerical calculation model of separate roadbed embankment slopes,the mechanical response and deformation characteristics of which at different slope heights and angles were analyzed in terms of stress and displacement.The results indicate that under traffic loads,stress concentration always occurs at the toe of the slope as the slope height increases.With the increase in slope height,the stress concentration zones of minimum principal stress,maximum shear stress and shear stress in the XZ direction continuously"erode"towards the lower side of the slope and the slope surface.Over time,the velocities in the X and Z directions at each monitoring point tend to be stable,and the magnitude of velocities matches the order of its maximum displacement.The bi-directional oscillations in the velocity-time curve at monitoring point 1 are caused by the time difference in the propagation of the vehicle load between the two lanes.At a slope angle of 30°,the high-frequency fluctuations in velocity at monitoring point 3 reflect the"bulging"in the middle of the failure surface.The X-direction displacement in the upper part of the slope exhibits a"striped"distribution at a certain inclination angle.At the toe of the slope,the displacement in the X-direction goes to zero,while the displacement in the Z-direction is maximal,considerably greater(2 to 3 times)than that in the X direction.As the slope height and angle increase,the displacements both in the X-and Z-direction initially increase and then decrease,which reach the maximum at a slope height of 15 m and a slope angle of 45°.At 20 m and 30°,the maximum displacement occurs at the middle of the slope surface.
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维普
