Effect of footing roughness on ultimate bearing capacity of rigid strip footing on sandy soil slope
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Author
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Pham Ngoc QuangThe University of Danang - University of Science and Technology, Danang, VietnamPham Ngoc VinhThe University of Danang - University of Science and Technology, Danang, Vietnam
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Tóm tắt
This study investigates the ultimate bearing capacity of a rigid strip footing on a sandy slope using the Rigid Plastic Finite Element Method (RPFEM). To accurately represent a wide range of frictional conditions at the footing roughness, a new interface element was introduced, capable of accommodating both perfectly rough and perfectly smooth conditions. A new constitutive equation is introduced to model these interface elements, which had a significant influence on the failure mode of the strip footing. Moreover, the study focuses on assessing critical parameters, including the internal friction angle of the sandy ground, as well as slope geometry parameters (slope angle b, edge distance L, and slope height H). The RPFEM results illustrate that increasing the edge distance positively influences the bearing capacity, while a higher slope angle exerts a negative effect. Notably, variations in slope height produce consistent outcomes, regardless of the frictional conditions.
Tài liệu tham khảo
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[1] Tang, P. Kok-Kwang, and T. Kim-Chuan, "Effect of footing width on Nγ and failure envelope of eccentrically and obliquely loaded strip footings on sand”, Canadian Geotechnical Journal, vol. 52, no. 6, pp. 694-707, 2015.
[2] Zheng, Z. Jiapeng, Z. Haizuo, and Z. Tianqi, "Ultimate bearing capacity of strip footings on sand overlying clay under inclined loading”, Computers and Geotechnics 106, 266-273, 2019.
[3] Q. Pham, S. Ohtsuka, K. Isobe, Y. Fukumoto, and T. Hoshina, "Ultimate bearing capacity of rigid footing under eccentric vertical load”, Soils and Foundations, vol. 59, no. 6, 1980-1991, 2019.
[4] Q. Pham, S. Ohtsuka, K. Isobe, and Y. Fukumoto, "Limit load space of rigid footing under eccentrically inclined load”, Soils and Foundations, vol. 60, no. 4, 811-824, 2020.
[5] Jim, M. Andrews, and D. H. Shields, "Stress characteristics for shallow footings in cohesionless slopes”, Canadian Geotechnical Journal, vol. 25, no. 2, 238-249, 1988.
[6] G. Meyerhof, "The ultimate bearing capacity of foundations on slopes”, In Proc., 4th Int. Conf. on Soil Mechanics and Foundation Engineering, vol. 1, 1957, pp. 384-386
[7] Yao, M. Zhao, R. Zhang, H. Zhao, and G. Wu, "Undrained bearing capacity of strip footings placed adjacent to two-layered slopes”, International Journal of Geomechanics, vol. 19, no. 8, 06019014, 2019.
[8] Haizuo, G. Zheng, X. Yang, T. Li, and P. Yang, "Ultimate seismic bearing capacities and failure mechanisms for strip footings placed adjacent to slopes”, Canadian Geotechnical Journal, vol. 56, no. 11 1729-1735, 2019.
[9] Gaoqiao, R. Zhang, M. Zhao, and S. Zhou, "Undrained stability analysis of eccentrically loaded strip footing lying on layered slope by finite element limit analysis”, Computers and Geotechnics, vol. 123, p. 103600, 2020.
[10] Q. Pham, S. Ohtsuka, K. Isobe, N.V. Pham, and P.H. Hoang, "Limit load space of rigid strip footing on sand slope subjected to combined eccentric and inclined loading”, Computers and Geotechnics, vol. 162, p. 105652, 2023.
[11] Li, A. Zhou, and P. Jiang. "Eccentric bearing capacity of embedded strip footings placed on slopes”, Computers and Geotechnics, vol. 119, p. 103352, 2020.
[12] Yang, B. Leshchinsky, K. Cui, F. Zhang, and Y. Gao, "Influence of failure mechanism on seismic bearing capacity factors for shallow foundations near slopes”, Géotechnique, vol. 71, no. 7, pp. 594-607, 2021.
[13] Q. Pham, and S. Ohtsuka. "Ultimate bearing capacity of rigid footing on two-layered soils of sand–clay”, International Journal of Geomechanics 21, no. 7, 04021115, 2021.
[14] Q. Pham, S. Ohtsuka, K. Isobe, and Y. Fukumoto, "Limit load space of rigid strip footing on cohesive-frictional soil subjected to eccentrically inclined loads”, Computers and Geotechnics 151, 104956, 2022.
[15] Q. Pham, S. Ohtsuka, K. Isobe, and PH. Hoang, "Ultimate bearing capacity of rigid strip footings on c-ϕ soil subjected to combined eccentric and inclined loading”, In IOP Conference Series: Materials Science and Engineering, vol. 1289, no. 1, IOP Publishing, 2023, p. 012088.
[16] Q. Pham, S. Ohtsuka, K. Isobe, and Y. Fukumoto, "Group effect on ultimate lateral resistance of piles against uniform ground movement”, Soils and Foundations, vol. 59, no. 1, pp. 27-40, 2019.
[17] Tamura, S. Kobayashi, and T. Sumi, "Rigid-plastic finite element method for frictional materials”, Soils and Foundations, vol. 27, no. 3, pp. 1-12, 1987.
[18] Asaoka and S. Ohtsuka, "Bearing capacity analysis of a normally consolidated clay foundation”, Soils and foundations, vol. 27, no. 3, 58-70, 1987.
[19] Hoshina, "Rigid plastic stability analysis for slope including thin weak layer”, Japanese Geotechnical Journal, vol. 6, no. 2, 191, 2011.
[20] Loukidis, T. Chakraborty, and R. Salgado. "Bearing capacity of strip footings on purely frictional soil under eccentric and inclined loads”, Canadian Geotechnical Journal, vol. 45, no. 6, pp. 768-787, 2008.
[21] Q. Pham and S. Ohtsuka. "Numerical Investigation on Bearing Capacity of Rigid Footing on Sandy Soils Under Eccentrically Inclined Load”, In Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering: Sustainable Energy and Marine Planning, Vol. 208, Springer Singapore, 2022, pp. 333-341. DOI:10.1007/978-981-16-7735-9 37
[22] N.Q. Pham, S. Ohtsuka, K. Isobe, and Y. Fukumoto, "Consideration on Limit Load Space of Footing on Various Soils Under Eccentric Vertical Load”, In Challenges and Innovations in Geomechanics: Proceedings of the 16th International Conference of IACMAG, Volume 126, Springer International Publishing, 2021, pp. 75-84.