Failure mechanisms and bearing capacity of strip footings on sand over clay under centric and eccentric loading

https://doi.org/10.31130/ud-jst.2026.24(3).737E

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Author

  • Pham Ngoc Quang
    The University of Danang - University of Science and Technology, Vietnam
    Pham Ngoc Vinh
    The University of Danang - University of Science and Technology, Vietnam
    Huynh Ngoc Thi
    Ho Chi Minh City University of Technology (HCMUT) – VNU - HCM, Vietnam; Vietnam National University Ho Chi Minh City, Vietnam
    Doan Hoang Tai
    Hue University – Quang Tri Branch, Quang Tri Province, Vietnam
    Vu Thi Hanh
    The University of Danang - University of Science and Technology, Vietnam

Từ khóa:

Ultimate bearing capacity
Strip footing
Two-layer soils
Centric loading
Eccentric loading
RPFEM

Tóm tắt

The bearing capacity and failure behavior of strip footings on two-layered soils are examined under concentric and eccentric loading using the Rigid Plastic Finite Element Method (RPFEM). The soil system consists of a sand layer overlying weak clay. A parametric study evaluates the effects of sand thickness D, internal friction angle ϕ, and clay cohesion cᵤ on ultimate capacity. Results show that increasing D significantly improves capacity compared with untreated clay, although the improvement becomes limited beyond a critical thickness D₀. This threshold increases with higher ϕ and decreases with larger cᵤ. Under eccentric loading, capacity decreases as eccentricity e increases, and a critical value e₀ is identified, beyond which failure is mainly governed by the sand layer. Based on numerical results, design charts are developed for practical evaluation of layered soil foundations over a wide range of D, ϕ, cᵤ, and e, supporting engineering design and verification of shallow foundations in layered ground conditions.

Tài liệu tham khảo

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Mar 31, 2026
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Quang, P. N., P. N. Vinh, H. N. Thi, D. H. Tai, và V. T. Hanh. “Failure Mechanisms and Bearing Capacity of Strip Footings on Sand over Clay under Centric and Eccentric Loading”. Tạp Chí Khoa học Và Công nghệ Đại học Đà Nẵng, vol 24, số p.h 3, Tháng Ba 2026, tr 53-58, doi:10.31130/ud-jst.2026.24(3).737E.

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