Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach
Pile supported geogrid-reinforced embankment are widely used to treat soft soil. This paper proposes a novel method for reinforcing foundations using non-foamed polyurethane-bonded gravel (NPBG) porous piles. Through triaxial compression tests, the mechanical properties and strength parameters, such...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2024.1488622/full |
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| author | Xin Hu Mengliang Li Huiming Tan |
| author_facet | Xin Hu Mengliang Li Huiming Tan |
| author_sort | Xin Hu |
| collection | DOAJ |
| description | Pile supported geogrid-reinforced embankment are widely used to treat soft soil. This paper proposes a novel method for reinforcing foundations using non-foamed polyurethane-bonded gravel (NPBG) porous piles. Through triaxial compression tests, the mechanical properties and strength parameters, such as strength and stiffness, of the polyurethane-bonded gravel material are determined. Finite element numerical simulations are then employed to investigate the bearing characteristics of NPBG porous pile under embankment loads. The experimental results indicate that, under the same confining pressure, the strength and stiffness of the NPBG material are significantly higher than those of plain gravel material, while still retaining large pore characteristics. Increasing the polyurethane content enhances the strength and stiffness of the porous material, but the improvement diminishes as the confining pressure increases. A systematic comparative analysis was conducted on the bearing characteristics of NPBG porous pile versus concrete pile, cement-mixed pile, and gravel pile under embankment in terms of load sharing ratio and settlement deformation. The permeability coefficient and modulus of the pile significantly influence the dissipation rate of excess pore water pressure in the foundation soil. The NPBGP pile exhibited the fastest consolidation speed, effectively controlling total settlement and reducing the proportion of post-construction settlement of the embankment. Compared to concrete pile and cement-mixed pile, the NPBG porous pile has a lower uniform settlement surface height in embankment, making it suitable for low-height embankment accelerated construction projects. |
| format | Article |
| id | doaj-art-f6b6ea73a0b940b1ac3530dc3ebed172 |
| institution | Kabale University |
| issn | 2296-424X |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj-art-f6b6ea73a0b940b1ac3530dc3ebed1722024-12-12T07:33:50ZengFrontiers Media S.A.Frontiers in Physics2296-424X2024-12-011210.3389/fphy.2024.14886221488622Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approachXin Hu0Mengliang Li1Huiming Tan2Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi’an, ChinaCollege of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, ChinaCollege of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, ChinaPile supported geogrid-reinforced embankment are widely used to treat soft soil. This paper proposes a novel method for reinforcing foundations using non-foamed polyurethane-bonded gravel (NPBG) porous piles. Through triaxial compression tests, the mechanical properties and strength parameters, such as strength and stiffness, of the polyurethane-bonded gravel material are determined. Finite element numerical simulations are then employed to investigate the bearing characteristics of NPBG porous pile under embankment loads. The experimental results indicate that, under the same confining pressure, the strength and stiffness of the NPBG material are significantly higher than those of plain gravel material, while still retaining large pore characteristics. Increasing the polyurethane content enhances the strength and stiffness of the porous material, but the improvement diminishes as the confining pressure increases. A systematic comparative analysis was conducted on the bearing characteristics of NPBG porous pile versus concrete pile, cement-mixed pile, and gravel pile under embankment in terms of load sharing ratio and settlement deformation. The permeability coefficient and modulus of the pile significantly influence the dissipation rate of excess pore water pressure in the foundation soil. The NPBGP pile exhibited the fastest consolidation speed, effectively controlling total settlement and reducing the proportion of post-construction settlement of the embankment. Compared to concrete pile and cement-mixed pile, the NPBG porous pile has a lower uniform settlement surface height in embankment, making it suitable for low-height embankment accelerated construction projects.https://www.frontiersin.org/articles/10.3389/fphy.2024.1488622/fullnon-foamed polyurethanegravel pileporous mediasettlementembankment |
| spellingShingle | Xin Hu Mengliang Li Huiming Tan Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach Frontiers in Physics non-foamed polyurethane gravel pile porous media settlement embankment |
| title | Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach |
| title_full | Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach |
| title_fullStr | Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach |
| title_full_unstemmed | Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach |
| title_short | Exploring mechanical performance of non-foamed polyurethane-bonded gravel and its pile bearing characteristics under embankments: an experimental and numerical approach |
| title_sort | exploring mechanical performance of non foamed polyurethane bonded gravel and its pile bearing characteristics under embankments an experimental and numerical approach |
| topic | non-foamed polyurethane gravel pile porous media settlement embankment |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2024.1488622/full |
| work_keys_str_mv | AT xinhu exploringmechanicalperformanceofnonfoamedpolyurethanebondedgravelanditspilebearingcharacteristicsunderembankmentsanexperimentalandnumericalapproach AT mengliangli exploringmechanicalperformanceofnonfoamedpolyurethanebondedgravelanditspilebearingcharacteristicsunderembankmentsanexperimentalandnumericalapproach AT huimingtan exploringmechanicalperformanceofnonfoamedpolyurethanebondedgravelanditspilebearingcharacteristicsunderembankmentsanexperimentalandnumericalapproach |