Evaluating Mechanical Properties of Earth Material During Intelligent Compaction (2020) / Chapter Skim
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Pages 60-69
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60 Calibration of Numerical Models Introduction This chapter compares the measured field data with the responses obtained from the forward models with different levels of sophistication. It presents strategies for calibration of the forward models that simulate the pavement responses during mapping and discusses the process of deriving adjustment factors for the forward models to represent the field conditions more realistically.
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Calibration of Numerical Models 61 Figure not to scale. 30 m30 m Figure 5-1.
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62 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Site Location Layer Properties of Geomaterial Resilient Modulus (MR) Results (Modified MEPDG Model)
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Calibration of Numerical Models 63 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 D ep th (m ) Displacement (mm)
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64 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction y = 2.56x R² = 0.58 SEE = 0.36 0 3 6 9 12 15 0.0 0.5 1.0 1.5 2.0 SS L FE M od el D isp la ce m en t ( m m ) Geophone Measured Peak Vertical Displacement (mm)
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Calibration of Numerical Models 65 0.0 0.2 0.4 0.6 0.8 1.0 -15 -10 -5 0 5 10 15 Distance of Geophone from IC Roller (m) 0.0 0.5 1.0 1.5 2.0 -15 -10 -5 0 5 10 15 Distance of Geophone from IC Roller (m)
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66 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Table 5-6 summarizes the transfer functions between the measured and simulated displacements for several levels of sophistication of FE models for all four cells. The SSL FE model displacement responses were about 3.5 times greater than those measured in the field, with a weak correlation coefficient of determination of 0.48.
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Calibration of Numerical Models 67 statistics of the relationships for the vibratory moving IC tests that were performed on top of the base layer at Site 2. Considering the nonlinear behavior of the materials yields better relationships among the measured and simulated results.
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68 Evaluating Mechanical Properties of Earth Material During Intelligent Compaction Global Relationships Considering the results obtained from the two test sites on top of single- and two-layer geosystems, this section aims to develop global relationships between the measured field data and the FE responses. Figure 5-9 compares the measured and simulated peak displacements directly under the roller at different depths, under both the stationary and moving conditions for the evaluated sites.
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From page 69... ...
Calibration of Numerical Models 69 Figure 5-10. Global relationships between field geophone-measured displacements and their corresponding SSN FE model displacements with different input modeling approaches.
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