Quantifying the Effects of Implements of Husbandry on Pavements: Appendices (2022) / Chapter Skim
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46 APPENDIX C EVALUATION OF THE SUBGRADE STRENGTH ESTIMATION METHODOLOGY USING LTPP DATABASE This appendix presents two case studies for the methodology developed by Nabizadeh et al.
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47 of this selection with a seasonal analysis. Warmer locations (Nebraska)
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49 For the other selected deflection data, once the backcalculated modulus for the subgrade and for the equivalent layer above the subgrade were estimated (Table C-3 and Table C-4) , the structure was simulated in a layered linear elastic software (MnLayer)
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50 Table C-4 - Backcalculated parameters and principal stresses for section South Dakota 0804 Backcalculated MnLayer Date Location FWD Load Level MR sub (psi)
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51 The resulting deviator (ฯd) stresses at each load level are used to compute (Equation C5)
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52 Table C-6 Subgrade parameters for section South Dakota 0804 Date Location FWD Load Level ๐๐๐๐ (psi)
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53 (b) Figure C-2 Deviator (ฯd)
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54 (b) Figure C-3 Linear fitting for deviator (ฯd)
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55 Date Location ฯdf (psi)
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57 Since the methodology is limited to deflection data indicating a softening behavior of the subgrade, the great majority of deflection data available for a particular section cannot be used to estimate subgrade parameters. This limitation is aggravated if the section is located in a cold climate region where the majority of data exhibits a hardening or linear subgrade behavior.
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