Causes of Tensile Strain of Asphalt Concrete Core Wall of Rockfill Dam in High-Cold Area During Construction
Asphalt concrete core rockfill dams, favored for their superior impermeability and adaptable deformation capacity (effectively accommodating uneven settlement), have been gaining increasing attention in Chinese engineering practice. However, ensuring safety during high-temperature paving and subsequ...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/adce/3072708 |
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| Summary: | Asphalt concrete core rockfill dams, favored for their superior impermeability and adaptable deformation capacity (effectively accommodating uneven settlement), have been gaining increasing attention in Chinese engineering practice. However, ensuring safety during high-temperature paving and subsequent cooling remains crucial. At the NG reservoir in Qinghai’s alpine region, measurements of vertical strain in the core wall initially indicated about 20–40 με (compressive), which shifted to 60–120 με (tensile) after continuous compaction. Ultimately, most readings surpassed 100 με, raising concerns about seepage prevention and overall safety. By developing a temperature-dependent finite element model and keeping deviations between simulated and observed data within roughly 5%, it was revealed that when the ambient temperature hovers around 0.56°C and the asphalt’s initial temperature is 147°C, constrained cooling can produce tensile strains exceeding 500 με. During prolonged intervals, they may even reach 900 με near the surface, risking cracks. Moreover, if the annual mean temperature is below 7.6°C and no additional insulation measures are adopted, the asphalt core wall becomes prone to tensile failure. Based on both measurements and simulations, this study emphasizes the importance of real-time strain and temperature monitoring, alongside computational modeling to mitigate excessive tensile deformation. These findings offer key insights for the design, construction, and safe operation of asphalt concrete core rockfill dams in cold regions. |
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| ISSN: | 1687-8094 |