Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method
Abstract The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test pil...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-46372-w |
| _version_ | 1827770690201190400 |
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| author | Dezhong Yu Yang Cao Qianqian Zhao |
| author_facet | Dezhong Yu Yang Cao Qianqian Zhao |
| author_sort | Dezhong Yu |
| collection | DOAJ |
| description | Abstract The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test piles, each with a length of 15 m and a diameter of 1.0 m, were poured based on the actual bridge construction project in the permafrost region of Daxing'an Mountains in China. Based on the temperature data between the piles and soil, the refreezing state of the pile foundation was comprehensively judged. Subsequently, the static method was employed to assess the friction resistance values and single pile bearing capacity of each soil layer on the pile side under different freezing states before and after the pile foundation refreezing. Building upon these findings, the restrictive parameters for soil elastic limit $$q_{(i)}$$ q ( i ) , soil resistance $$R_{U} (i)$$ R U ( i ) and other parameters in the pile-soil model of high-strain dynamic test method are clarified. The test and analysis results indicate that under the condition that the ground temperature of frozen soil is about − 1.9 °C, the pile-soil refreezing takes about 120 days, and the pile-soil refreezing is a slow process; In CAPWAPC calculation program, after the values of soil parameters were constrained by the results of static-load test, the calculated curve is in satisfactory agreement with the measured curve, and the parameters of the pile-soil model are reliable, which can be used for the rapid detection of the ultimate bearing capacity of piles in permafrost regions; In the process of pile-soil refreezing, the change of temperature field affects the freezing strength between pile and soil, the process of pile-soil refreezing is positively correlated with the increase of pile foundation bearing capacity. |
| first_indexed | 2024-03-11T12:43:11Z |
| format | Article |
| id | doaj.art-d466ec7e16ad4f2187d2acf08a50e157 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-11T12:43:11Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-d466ec7e16ad4f2187d2acf08a50e1572023-11-05T12:12:29ZengNature PortfolioScientific Reports2045-23222023-11-0113111510.1038/s41598-023-46372-wAnalysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test methodDezhong Yu0Yang Cao1Qianqian Zhao2School of Urban Construction, Zhejiang Shuren UniversitySchool of Urban Construction, Zhejiang Shuren UniversitySchool of Water Conservancy and Civil Engineering, Northeast Agricultural UniversityAbstract The high-strain dynamic test method possesses the attributes of speed, efficiency, and environmentally-friendly, low-carbon characteristics. To study the reliability of the high-strain dynamic test method in detecting the bearing capacity of pile foundation in permafrost regions, 4 test piles, each with a length of 15 m and a diameter of 1.0 m, were poured based on the actual bridge construction project in the permafrost region of Daxing'an Mountains in China. Based on the temperature data between the piles and soil, the refreezing state of the pile foundation was comprehensively judged. Subsequently, the static method was employed to assess the friction resistance values and single pile bearing capacity of each soil layer on the pile side under different freezing states before and after the pile foundation refreezing. Building upon these findings, the restrictive parameters for soil elastic limit $$q_{(i)}$$ q ( i ) , soil resistance $$R_{U} (i)$$ R U ( i ) and other parameters in the pile-soil model of high-strain dynamic test method are clarified. The test and analysis results indicate that under the condition that the ground temperature of frozen soil is about − 1.9 °C, the pile-soil refreezing takes about 120 days, and the pile-soil refreezing is a slow process; In CAPWAPC calculation program, after the values of soil parameters were constrained by the results of static-load test, the calculated curve is in satisfactory agreement with the measured curve, and the parameters of the pile-soil model are reliable, which can be used for the rapid detection of the ultimate bearing capacity of piles in permafrost regions; In the process of pile-soil refreezing, the change of temperature field affects the freezing strength between pile and soil, the process of pile-soil refreezing is positively correlated with the increase of pile foundation bearing capacity.https://doi.org/10.1038/s41598-023-46372-w |
| spellingShingle | Dezhong Yu Yang Cao Qianqian Zhao Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method Scientific Reports |
| title | Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method |
| title_full | Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method |
| title_fullStr | Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method |
| title_full_unstemmed | Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method |
| title_short | Analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high-strain dynamic test method |
| title_sort | analysis on the synergistic variation law of pile refreezing process and bearing capacity based on high strain dynamic test method |
| url | https://doi.org/10.1038/s41598-023-46372-w |
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