Resets - Rutting

Overview

This page outlines the Resets applied to Rut depth by different treatments. It is important to note that what is described below is only the pattern assumed for rut reset. The Default Road Network model allows you to modify the key values related to rut reset using the Lookup values. This means you can control the relative reset applied by different treatments without having to modify the underlying C# model.

Preservation and Holding Treatments

It is well-established that light Preservation treatments such as Chipseals and Thin Asphalt surfacings do not reset rut depth completely. In most cases, light preservation treatments only effect a slight improvement in rut depth, and the rut depth after treatment is typically well-correlated with the rut depth before treatment.

The model assumed for rut reset under Preservation treatments is dependent on two factors:

  • Exceedance Factor - factor below which the rut before and after treatment is assumed to remain the same

  • Improvement Factor - factor by which the rut portion above the exceedance threshold is reduced by the treatment

The concept is illustrated by the figure below:

Figure 1: Rut Reset Concept

An example calculation for two different improvement factors is shown below:

Figure 2: Rut Reset Example

The model allows you to set the Exceedance Factor and Improvement Factor individually for Preservations and Holding Actions in the lookup sets ‘reset_exceed_thresh_rut’ and ‘reset_perc_improv_facts_rut’. See this link for details on these lookup factors.

Rehabilitations

For rehabilitations, a single fixed reset value is currently assigned. This rather simple model will be improved upon in future versions of the model. The Rut Reset assigned for rehabilitation is specified in the ‘rehab_resets_rut’ lookup set.