Abstract
In current theory of earth pressure calculations for high fill culverts, the extended modes of sliding surface and shear friction stress are always neglected, leading to great difference between theoretical calculations and field measurements. To overcome this drawback, a novel earth pressure theory for high fill culverts is developed, which takes into account extension modes of sliding surface and shear friction stress. Firstly, a finite element method (FEM) model of the high fill culvert is established by Plaxis2D. In addition, extension modes of sliding surface and directions of shear friction stress are summarized by FEM simulations. Secondly, based on the limit equilibrium theory of granular materials, theoretical equations of positive projecting (PP) and induced trench installation (ITI) culvert considering extension modes of sliding surface and shear friction stress are derived. Thirdly, the theoretical calculations are in good agreement with field measurements and numerical simulations, demonstrating the accuracy of the PP and ITI culvert theoretical equations. Finally, a parametric analysis is performed to explore how three main factors, including fill height, thickness of the expanded polystyrene (EPS) geofoam, and the ratio of the deformation modulus of fill to the EPS geofoam block, affected the earth pressure on the culvert top.
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Abbreviations
- B :
-
Culvert width (m)
- B′:
-
Width of inner soil column (m)
- L :
-
Culvert length (m)
- H :
-
Distance between fill top surface and culvert top (m)
- H e :
-
Equal settlement surface height (m)
- h :
-
Thickness of EPS plate (m)
- z :
-
Depth of fill (m)
- S 1 :
-
Settlement of inner soil column (m)
- S 2 :
-
Settlement of outer soil column (m)
- ΔS :
-
Difference settlement between inner and outer soil column (m)
- τ :
-
Shear friction stress (kN)
- τ1, τ2 :
-
Shear friction stress of outer soil column (kN)
- τ1 ′, τ2 ′ :
-
Shear friction stress of inner soil column (kN)
- P :
-
Earth pressure (kPa)
- P´:
-
EPS plate removes earth pressure (kPa)
- P C :
-
Earth pressure of culvert top (kPa)
- E :
-
Modulus of elasticity (MPa)
- E S :
-
Modulus of elasticity of fill (MPa)
- E P :
-
Modulus of elasticity of EPS (MPa)
- c :
-
Cohesion (kPa)
- C :
-
Constant (dimensionless)
- σ :
-
Vertical stress (kPa)
- σ 1, σ 2 :
-
Static earth pressure (kPa)
- ε :
-
Strain (%)
- γ :
-
Unit weight (kN/m3)
- μ :
-
Poisson’s ratio (dimensionless)
- φ :
-
Internal friction angle (°)
- α :
-
Inclination angle between sliding surface and he vertical direction (°)
- ρ EPS :
-
Density of EPS plate (kg/m3)
- δ :
-
Vertical deformation of EPS plate (m)
- K 0 :
-
Lateral earth pressure coefficient at-rest (dimensionless)
- ω c :
-
Aspect ratio of rigid culvert L/B (dimensionless)
- k v :
-
Earth pressure ratio P/γH (dimensionless)
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Acknowledgements
The authors are grateful for the financial support of the National Natural Science Foundation of China (No. 52078194), the National Young Top-notch Talent of "Ten Thousand Talents Program", the Science Fund for Distinguished Young Scholars of Hubei Province(2022CFA043), the Young Top-notch Talent Cultivation Program of Hubei Province, the Outstanding Young and middle-aged Science and Technology Innovation Team of colleges and universities in Hubei Province (No. T2022010), and the Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes (No. 2020EJB004).
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Appendix
Appendix
In this paper, some of the steps for calculating the equations are omitted, mainly as follows:
Equation (1) can be derived from the following equation:
Equation (3) can be derived from the following equation:
Equation (5) can be derived from the following equation:
Equation (7) can be derived from the following equation:
Equation (9) can be derived from the following equation:
Equation (11) can be derived from the following equation:
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Ma, Q., Chen, Z., Zheng, J. et al. Earth Pressure Calculation of High Fill Culvert Considering Inclination of Soil Column Interface. Iran J Sci Technol Trans Civ Eng (2024). https://doi.org/10.1007/s40996-024-01416-7
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DOI: https://doi.org/10.1007/s40996-024-01416-7