Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples
Previous studies have shown that over-wet soil is challenging to compact and exhibits large creep deformation. The consolidation test of small specimens cannot accurately reflect the compression law, and creep is underestimated owing to size effects, which affects the engineering quality. In order t...
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MDPI AG
2024-11-01
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| author | Bo Peng Lijian Wu Ruiling Feng Changjun Song Jiangxin Liu Xiaolin Bian |
| author_facet | Bo Peng Lijian Wu Ruiling Feng Changjun Song Jiangxin Liu Xiaolin Bian |
| author_sort | Bo Peng |
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| description | Previous studies have shown that over-wet soil is challenging to compact and exhibits large creep deformation. The consolidation test of small specimens cannot accurately reflect the compression law, and creep is underestimated owing to size effects, which affects the engineering quality. In order to accurately analyze the compression process of over-wet soil and establish its settlement calculation method, this study focuses on over-wet soil in Anhui Province, China, and uses a large-sized tester to load and analyze its compression law. The thermogravimetric analysis method was employed to investigate the changes in water with different binding forces during the compression process, and the settlement calculation method for over-wet soil was explored. The results show that the creep of over-wet soil is large and long-lasting, and the three-stage consolidation division method based on the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><mo>−</mo><mi>t</mi></mrow></semantics></math></inline-formula> curve is more effective in analyzing its regularity. The creep of over-wet soil is directly proportional to its water content. When the load exceeds the pre-consolidation pressure, the creep deformation becomes more significant, accounting for about 60% of the deformation under a single level load. It is recommended to use the creep coefficient (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>λ</mi></mrow></semantics></math></inline-formula>) for calculation. The results of the thermogravimetric analysis indicate that during the primary consolidation stage, free water is discharged, and weakly bound water is mainly discharged during the third consolidation stage, which is the main cause of creep. Finally, based on the relationship between the creep strain and water content of large samples, a calculation method for the settlement of over-wet soil foundations based on the layered summation method was established, which had a higher prediction accuracy than the conventional layered summation method. The results of this study will help clarify the deformation process and principle of over-wet soil and improve the quality of engineering. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-11-01 |
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| series | Applied Sciences |
| spelling | doaj-art-4f308a8af2684c5e9d8a643432c4a0642024-11-26T17:48:01ZengMDPI AGApplied Sciences2076-34172024-11-0114221024710.3390/app142210247Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large SamplesBo Peng0Lijian Wu1Ruiling Feng2Changjun Song3Jiangxin Liu4Xiaolin Bian5Research Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, ChinaResearch Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, ChinaSchool of Civil Engineering, Beijing Jiaotong University, No. 3 Shangyuancun, Haidian District, Beijing 100044, ChinaResearch Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, ChinaResearch Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, ChinaResearch Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, ChinaPrevious studies have shown that over-wet soil is challenging to compact and exhibits large creep deformation. The consolidation test of small specimens cannot accurately reflect the compression law, and creep is underestimated owing to size effects, which affects the engineering quality. In order to accurately analyze the compression process of over-wet soil and establish its settlement calculation method, this study focuses on over-wet soil in Anhui Province, China, and uses a large-sized tester to load and analyze its compression law. The thermogravimetric analysis method was employed to investigate the changes in water with different binding forces during the compression process, and the settlement calculation method for over-wet soil was explored. The results show that the creep of over-wet soil is large and long-lasting, and the three-stage consolidation division method based on the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>d</mi><mo>−</mo><mi>t</mi></mrow></semantics></math></inline-formula> curve is more effective in analyzing its regularity. The creep of over-wet soil is directly proportional to its water content. When the load exceeds the pre-consolidation pressure, the creep deformation becomes more significant, accounting for about 60% of the deformation under a single level load. It is recommended to use the creep coefficient (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>λ</mi></mrow></semantics></math></inline-formula>) for calculation. The results of the thermogravimetric analysis indicate that during the primary consolidation stage, free water is discharged, and weakly bound water is mainly discharged during the third consolidation stage, which is the main cause of creep. Finally, based on the relationship between the creep strain and water content of large samples, a calculation method for the settlement of over-wet soil foundations based on the layered summation method was established, which had a higher prediction accuracy than the conventional layered summation method. The results of this study will help clarify the deformation process and principle of over-wet soil and improve the quality of engineering.https://www.mdpi.com/2076-3417/14/22/10247over-wet soilcreep coefficientthermogravimetricsettlement calculation |
| spellingShingle | Bo Peng Lijian Wu Ruiling Feng Changjun Song Jiangxin Liu Xiaolin Bian Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples Applied Sciences over-wet soil creep coefficient thermogravimetric settlement calculation |
| title | Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples |
| title_full | Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples |
| title_fullStr | Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples |
| title_full_unstemmed | Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples |
| title_short | Compression Law and Settlement Calculation Method of Over-Wet Soil Based on Large Samples |
| title_sort | compression law and settlement calculation method of over wet soil based on large samples |
| topic | over-wet soil creep coefficient thermogravimetric settlement calculation |
| url | https://www.mdpi.com/2076-3417/14/22/10247 |
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