An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load
Estimating a pile shaft’s frictional capacity is challenging and has been a controversial subject among researchers. In this study, the shaft friction resistance of non-displacement (pre-installed) model piles under axial load was investigated. Four different model piles were used, including steel,...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-08-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/13/16/9355 |
| _version_ | 1797585639265271808 |
|---|---|
| author | Huseyin Suha Aksoy Nichirvan Ramadhan Taher Aykut Ozpolat Mesut Gör Omer Muhammad Edan |
| author_facet | Huseyin Suha Aksoy Nichirvan Ramadhan Taher Aykut Ozpolat Mesut Gör Omer Muhammad Edan |
| author_sort | Huseyin Suha Aksoy |
| collection | DOAJ |
| description | Estimating a pile shaft’s frictional capacity is challenging and has been a controversial subject among researchers. In this study, the shaft friction resistance of non-displacement (pre-installed) model piles under axial load was investigated. Four different model piles were used, including steel, timber, and two composite piles (FRP and PVC filled with concrete). The angle of interface friction (δ) between test sand, and pile materials was determined using an interface shear test (IST) at four relative densities. Axial pile load experiments were implemented in a soil tank and piles were embedded into loose to very dense sand. Model pile load tests were performed in such a way that there was no end (point) bearing capacity (only friction was generated), and lateral friction resistance between the pile material and the soil along the pile shaft formed the complete bearing capacity of the model pile. According to experimental results, it was observed that, with increasing sand relative density and surface roughness of the pile material, the shaft friction resistance of the model pile increases. A back-calculation analysis was also performed to find the values of lateral earth pressure coefficient (K) using Burland’s (1973) equation with the help of measured shaft friction capacity of the model pile load test. By performing multivariate regression analysis, an equation was obtained between the back-calculated lateral earth pressure coefficient (K) and other parameters. The obtained equation was used to calculate the K values given in other studies in the literature. It was determined that the obtained equation was in good agreement with the data in other studies. This equation can be beneficial in practice and can be advantageous for further study in the future. |
| first_indexed | 2024-03-11T00:09:56Z |
| format | Article |
| id | doaj.art-c7d4d0ef851c41e5a3a72ad95683cc56 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T00:09:56Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c7d4d0ef851c41e5a3a72ad95683cc562023-11-19T00:08:27ZengMDPI AGApplied Sciences2076-34172023-08-011316935510.3390/app13169355An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial LoadHuseyin Suha Aksoy0Nichirvan Ramadhan Taher1Aykut Ozpolat2Mesut Gör3Omer Muhammad Edan4Department of Civil Engineering, Engineering Faculty, Firat University, 23100 Elazig, TurkeyDepartment of Civil Engineering, Engineering Faculty, Firat University, 23100 Elazig, TurkeyDepartment of Civil Engineering, Technology Faculty, Firat University, 23100 Elazig, TurkeyDepartment of Civil Engineering, Engineering Faculty, Firat University, 23100 Elazig, TurkeyDepartment of Civil Engineering, Engineering Faculty, Firat University, 23100 Elazig, TurkeyEstimating a pile shaft’s frictional capacity is challenging and has been a controversial subject among researchers. In this study, the shaft friction resistance of non-displacement (pre-installed) model piles under axial load was investigated. Four different model piles were used, including steel, timber, and two composite piles (FRP and PVC filled with concrete). The angle of interface friction (δ) between test sand, and pile materials was determined using an interface shear test (IST) at four relative densities. Axial pile load experiments were implemented in a soil tank and piles were embedded into loose to very dense sand. Model pile load tests were performed in such a way that there was no end (point) bearing capacity (only friction was generated), and lateral friction resistance between the pile material and the soil along the pile shaft formed the complete bearing capacity of the model pile. According to experimental results, it was observed that, with increasing sand relative density and surface roughness of the pile material, the shaft friction resistance of the model pile increases. A back-calculation analysis was also performed to find the values of lateral earth pressure coefficient (K) using Burland’s (1973) equation with the help of measured shaft friction capacity of the model pile load test. By performing multivariate regression analysis, an equation was obtained between the back-calculated lateral earth pressure coefficient (K) and other parameters. The obtained equation was used to calculate the K values given in other studies in the literature. It was determined that the obtained equation was in good agreement with the data in other studies. This equation can be beneficial in practice and can be advantageous for further study in the future.https://www.mdpi.com/2076-3417/13/16/9355shaft friction resistancelateral earth pressure coefficient (K)interface friction angle (δ)relative density (Dr)interface shear test (IST) |
| spellingShingle | Huseyin Suha Aksoy Nichirvan Ramadhan Taher Aykut Ozpolat Mesut Gör Omer Muhammad Edan An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load Applied Sciences shaft friction resistance lateral earth pressure coefficient (K) interface friction angle (δ) relative density (Dr) interface shear test (IST) |
| title | An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load |
| title_full | An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load |
| title_fullStr | An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load |
| title_full_unstemmed | An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load |
| title_short | An Experimental Study on Estimation of the Lateral Earth Pressure Coefficient (K) from Shaft Friction Resistance of Model Piles under Axial Load |
| title_sort | experimental study on estimation of the lateral earth pressure coefficient k from shaft friction resistance of model piles under axial load |
| topic | shaft friction resistance lateral earth pressure coefficient (K) interface friction angle (δ) relative density (Dr) interface shear test (IST) |
| url | https://www.mdpi.com/2076-3417/13/16/9355 |
| work_keys_str_mv | AT huseyinsuhaaksoy anexperimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT nichirvanramadhantaher anexperimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT aykutozpolat anexperimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT mesutgor anexperimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT omermuhammadedan anexperimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT huseyinsuhaaksoy experimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT nichirvanramadhantaher experimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT aykutozpolat experimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT mesutgor experimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload AT omermuhammadedan experimentalstudyonestimationofthelateralearthpressurecoefficientkfromshaftfrictionresistanceofmodelpilesunderaxialload |