Research Article
Experimental and Numerical Study on the Behavior of Energy Piles Subjected to Thermal Cycles
Table 2
Material parameters of the sands.
| | | Yangzhou sand (test sand) | Loose Sacramento River sand | Dense Sacramento River sand |
| Thermal parameters | Dry density, () | 1490 | 1450 | 1670 | Thermal conductivity of soil particle, () | 2.4 | 2.4 | 2.4 | Specific heat of soil particle, () | 930 | 930 | 930 | Linear thermal expansion coefficient of soil particle, () | 10.0 | 10.0 | 10.0 |
| MC model | Elastic modulus, () | 3.34 | — | — | Poisson’s ratio, | 0.3 | — | — | Cohesion, () | 0 | — | — | Friction angle, () | 30.6 | — | — | Dilation angle, () | 0.0 | — | — |
| BS model | Initial void ratio, | 0.78 | 0.87 | 0.61 | Elastic swelling modulus, | 0.01 | 0.01 | 0.0075 | Poisson’s ratio, | 0.3 | 0.2 | 0.2 | Critical void ratio at 100 kPa, | 0.60 | 0.97 | 0.84 | Slope of the critical state line, | 0.12 | 0.076 | 0.076 | Ellipse aspect ratio, | 2.0 | 2.2 | 1.65 | Residual friction angle in compression, () | 30.6 | 34.6 | 36.2 | Residual friction angle in tension, () | 30.6 | 34.6 | 36.2 | Peak friction angle, () | 32.0 | 35.7 | 43.8 | Plastic modulus, | 1.0 | 2.0 | 2.0 | Elastic modulus at 100 kPa, () | 12.0 | 18.7 | 21.5 |
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