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Numerical Investigation of Load Transfer in Geosynthetic-Reinforced Embankments Over Cavities: Effects of Opening Process and Cyclic Loading

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Abstract

During the construction of urban roads and infrastructure, factors such as groundwater, soil subsidence, and underground erosion can lead to the formation of cavities. Using geosynthetics to reinforce embankments over these cavities has demonstrated technical and economic efficiency while reducing construction time. Previous studies have explored stress transfer processes, including the arching effect within embankments, the membrane effect of geosynthetics, and settlement of the embankment and ground. However, these studies have been limited in their examination of cavity-opening processes. This paper uses the finite element method to analyze load transfer in geosynthetic-reinforced embankments over cavities, considering cavity opening processes and the effect of cyclic loading. The numerical model is built based on the experimental work of Villard and Briançon (Can Geotech J 45: 196–209, 2008). The numerical results are validated against experimental results, confirming the reliability of the numerical modeling. The results also show that the gradual expansion of the cavities leads to an increase in surface deformation, geosynthetic deflection, and the formation of a conical stress distribution pattern. Increasing the number of cyclic loads induces a reduction in stress transfer within the embankment while increasing surface settlement and geosynthetic deflection. Additionally, a mathematical equation for the distribution of stress acting on the geosynthetic is proposed to enhance the accuracy of previous analytical methods.

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Data Availability

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

2D:

Two-dimensional

c:

Cohesion (kN/m2)

B:

Cavity width (m)

D:

Downward opening

DEM:

Discrete element method

E:

Efficacy of load transfer (%)

E’:

Young’s modulus (kN/m2)

FEM:

Finite element method

GSY:

Geosynthetic reinforcement

H:

Embankment height (m)

J:

Geosynthetic stiffness (kN/m)

L:

Length of foundation soil (m)

LL :

Length of left side of cavity (m)

LR :

Length of right side of cavity (m)

N:

Number of load cycle

P:

Progressive opening

q:

Top load (kPa)

Q:

Load applied on the geosynthetic situated above cavity (kPa)

φ :

Friction angle (°)

ψ:

Dilatancy angle of filling soil (°)

ν:

Poisson ratio

γ:

Unit weight (kN/m3)

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Acknowledgements

We would like to thank Ho Chi Minh City University of Technology (HCMUT), VNU-HCM for the support of time and facilities for this study.

Funding

The authors have not disclosed any funding.

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Authors

Contributions

MTP: Conceptualization, Investigation, Methodology, Validation, Writing—original draft. DDN: Conceptualization, Investigation. TDN: Investigation, Editing. VHP: Methodology, Writing—review & editing, Conceptualization and General Supervision All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to Minh-Tuan Pham.

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The authors state that there are no conflicting interests that could inappropriately bias this work, and the authors still declare their interest in the development of this research.

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Pham, MT., Nguyen, DD., Nguyen, TD. et al. Numerical Investigation of Load Transfer in Geosynthetic-Reinforced Embankments Over Cavities: Effects of Opening Process and Cyclic Loading. Geotech Geol Eng (2024). https://doi.org/10.1007/s10706-024-02927-w

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  • DOI: https://doi.org/10.1007/s10706-024-02927-w

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