Application of Longitudinal Vibration Theory in Manhole Settlement Study

摘要

The traffic load was simulated by stable simple harmonic load. Taking the mostrndangerous condition, the advantageous effect of the pipeline connected to thernmanhole was neglected. With the effect of soil on the manhole simulated by Voigtrnmodel, the longitudinal vibration equation of the manhole in viscoelastic soil wasrnestablished considering its gravity. The semi-analytical solution in time-domain andrnthe curve of manhole settlement were obtained with Laplace transform and inversernFourier transform. A three-dimensional finite element model, considering thernnonlinear mechanics behavior of the manhole under traffic load, was set up tornvalidate the reliability of the theoretical method using the software of ANSYS. Thernfinite element model result showed that the curves of manhole settlement gainedrnfrom these two methods were nearly consistent, which shows that the proposedrntheoretical method is feasible to analyze the manhole settlement under traffic load.