Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles
To study the pile-forming mechanism and bearing deformation characteristics of continuous flight auger (CFA) piles, a series of procedures, including helical drilling, pulling up/grouting, and inserting cage/pile forming, were simulated in clay-sand double-layer foundations by a homemade model drill...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/4827596 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832557136797761536 |
|---|---|
| author | Deliang Zhu Yue Li Lingwei Zheng Pengfei Fang Xinyu Xie |
| author_facet | Deliang Zhu Yue Li Lingwei Zheng Pengfei Fang Xinyu Xie |
| author_sort | Deliang Zhu |
| collection | DOAJ |
| description | To study the pile-forming mechanism and bearing deformation characteristics of continuous flight auger (CFA) piles, a series of procedures, including helical drilling, pulling up/grouting, and inserting cage/pile forming, were simulated in clay-sand double-layer foundations by a homemade model drilling machine system in laboratory model tests. The effects of two different pile-forming methods on the load transfer and bearing characteristics of the piles were investigated by performing a model test comparison of CFA piles and bored piles. The experimental results show that there exist a soil improvement effect around the pile and a diameter expansion effect during the drilling process and grouting process for the CFA pile, which can effectively improve the lateral friction resistance of the pile. Compared with the bored pile, the pile diameter in the middle of the CFA pile increased by 19%, and the total lateral friction resistance of the CFA pile increased by 9.1% at a high load (1500 N). The comparative results of the model tests show that the bearing capacity of a single CFA pile increased by 50.0% and that the total settlement decreased by 40.5%. The results of the in situ test piles show that the load-settlement curves of the two pile types are similar under low-medium loads and that the lateral friction resistance of the CFA pile under high loads is better developed, which is relatively consistent with the model test results. |
| format | Article |
| id | doaj-art-f2772454ffd34a7197da65053a811dc8 |
| institution | Kabale University |
| issn | 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-f2772454ffd34a7197da65053a811dc82025-02-03T05:43:35ZengWileyAdvances in Civil Engineering1687-80942021-01-01202110.1155/2021/4827596Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA PilesDeliang Zhu0Yue Li1Lingwei Zheng2Pengfei Fang3Xinyu Xie4College of Civil Engineering & ArchitectureResearch Center of Coastal and Urban Geotechnical EngineeringNingboTech UniversityNingboTech UniversityResearch Center of Coastal and Urban Geotechnical EngineeringTo study the pile-forming mechanism and bearing deformation characteristics of continuous flight auger (CFA) piles, a series of procedures, including helical drilling, pulling up/grouting, and inserting cage/pile forming, were simulated in clay-sand double-layer foundations by a homemade model drilling machine system in laboratory model tests. The effects of two different pile-forming methods on the load transfer and bearing characteristics of the piles were investigated by performing a model test comparison of CFA piles and bored piles. The experimental results show that there exist a soil improvement effect around the pile and a diameter expansion effect during the drilling process and grouting process for the CFA pile, which can effectively improve the lateral friction resistance of the pile. Compared with the bored pile, the pile diameter in the middle of the CFA pile increased by 19%, and the total lateral friction resistance of the CFA pile increased by 9.1% at a high load (1500 N). The comparative results of the model tests show that the bearing capacity of a single CFA pile increased by 50.0% and that the total settlement decreased by 40.5%. The results of the in situ test piles show that the load-settlement curves of the two pile types are similar under low-medium loads and that the lateral friction resistance of the CFA pile under high loads is better developed, which is relatively consistent with the model test results.http://dx.doi.org/10.1155/2021/4827596 |
| spellingShingle | Deliang Zhu Yue Li Lingwei Zheng Pengfei Fang Xinyu Xie Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles Advances in Civil Engineering |
| title | Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles |
| title_full | Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles |
| title_fullStr | Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles |
| title_full_unstemmed | Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles |
| title_short | Laboratory Model Study on the Pile-Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles |
| title_sort | laboratory model study on the pile forming mechanisms and bearing deformation characteristics of cfa piles |
| url | http://dx.doi.org/10.1155/2021/4827596 |
| work_keys_str_mv | AT deliangzhu laboratorymodelstudyonthepileformingmechanismsandbearingdeformationcharacteristicsofcfapiles AT yueli laboratorymodelstudyonthepileformingmechanismsandbearingdeformationcharacteristicsofcfapiles AT lingweizheng laboratorymodelstudyonthepileformingmechanismsandbearingdeformationcharacteristicsofcfapiles AT pengfeifang laboratorymodelstudyonthepileformingmechanismsandbearingdeformationcharacteristicsofcfapiles AT xinyuxie laboratorymodelstudyonthepileformingmechanismsandbearingdeformationcharacteristicsofcfapiles |