| Numerical simulation of anti-frozen heave by replace-filling measures for lined canal in seasonal frozen soil region |
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| DOI：10.7606/j.issn.1000-7601.2013.06.015 |
| Key Words: lined canal phase transition temperature field frozen heave numerical simulation replace-filling method |
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| Abstract: |
| In order to prevent the frost heave damage to lined channel in seasonal frozen soil region, carried out the research on the effect of anti-frozen heave measures by replacing frost heave sensitive soil in canal base. Considered the actual boundary condition, set up the mathematical model of phase transition temperature field in shallow frozen soil. Carried out the coupled heat-stress analysis of different filling depths by using FEM. The results revealed that: Under the ground of shady canal slope, canal bottom and surface of sunny slope at 1.670 m, 1.128 m and 1.547 m, here,was the active zone of freezing and thawing. The replacing soil depth closely was submited a positive correlations with the frozen depth. It also shown that with increasing the replacement depth, the normal vitical frozen heave of the concrete lined channel will be reduced. When the replace-filling rates in channel shady slope, bottom and sunny slope were 53.9%, 58.2% and 79.8% respectively, the normal isplacements of concrete lining were decreased by 96.9%, 95.54% and 96.83%. Also the normal displacement was 0.6～0.7 cm which was remained within the standar accepted value as 0.5～1.0 cm. This measures can be effectively alleviated the frozen heave damage of channels and provided a theoretic reference for optimal design of the replace-filling in engineering practices. |
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