Geotechnical data of existing conditions often dictates that designers adjust the thickness of materials to be applied along a corridor by controlling the sublayer profile grade lines independent of the top layer profile grade line.
In the past, a basic method was used to model sublayers and create separate templates with differing vertical offsets from the original top layer to the sublayers. This method required the following steps:
While this method accomplished the task, it could be tedious and did not adequately address rapid change of layer thicknesses.
Today a new approach is recommended to better address control of sublayers. First, though, users should be aware of the following rules:
In addition, to effectively vary the subgrade, users must understand the following criteria:
Based on these criteria, the following workflow effectively enables users to quickly create and modify sublayers to follow a variable depth layer design:
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