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Effect of Subsurface Cavities on the Bearing Capacity of Shallow Strip Foundations in Soft Clay: A Numerical Study | ||
| Civil Engineering and Applied Solutions | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 30 مهر 1404 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22080/ceas.2025.29867.1036 | ||
| نویسندگان | ||
| Vali Ghaseminejad* ؛ Atina Tarrah؛ Fereshteh Ghomi | ||
| Department of Civil Engineering, Nowshahr Branch, Islamic Azad University, Nowshahr, Iran. | ||
| تاریخ دریافت: 28 مرداد 1404، تاریخ بازنگری: 25 مهر 1404، تاریخ پذیرش: 30 مهر 1404 | ||
| چکیده | ||
| Subsurface cavities, both natural and anthropogenic, pose significant geotechnical challenges by altering stress distribution beneath shallow foundations. Conventional design approaches for strip footings often neglect the effects of such voids, potentially resulting in unsafe or overly conservative designs. This study employs a numerical investigation using the finite element software PLAXIS 2D to assess the impact of underground cavities on the bearing capacity of shallow strip foundations resting on soft clay. A parametric analysis was conducted to examine the effects of cavity diameter, embedment depth, and both horizontal and vertical offsets relative to the footing center. The footing was modeled as a rigid body, while the surrounding soil was represented as soft clay. Results indicate that increasing cavity diameter markedly reduces the ultimate bearing capacity. For example, for a strip footing 2.0 m wide, enlarging the cavity diameter from 0.5 m to 1.0 m resulted in a reduction of approximately 200 kPa in bearing capacity. Additionally, increasing the cavity diameter from 0.25 to 0.5 times the footing width led to a 25%–40% decrease in load-bearing capacity. The study also identifies a critical influence zone beneath the footing where the presence of voids most significantly compromises performance. These findings underscore the importance of incorporating subsurface cavity effects into geotechnical design, particularly in urban areas, to enhance the safety and reliability of shallow foundations on soft clay. | ||
| کلیدواژه‌ها | ||
| Shallow Foundations؛ Bearing Capacity؛ Subsurface Cavities؛ Clay Soils؛ Finite Element Analysis (Plaxis 2D) | ||
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