Figure 6. Horizontal Strain Analysis Varying Base Stiffness
Vertical Strains
Vertical strains have been used in the past to determine how much deformation is likely
to occur on top of the subgrade and thus help determine rutting due to subgrade permanent
deformation (Huang, 2004). In addition, vertical strains are used in the permanent deformation
model of the proposed MEPDG. In this model, resilient vertical strain responses are computed
to obtain plastic strain accumulations that are then used to compute the rutting within the HMA
layer (NCHRP, 2004). The vertical strain analysis performed is shown in Figure 7.
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