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<p>The seismic bearing capacity of shallow foundations located near slope crests remains a critical concern in geotechnical engineering, where complex slope foundation interactions can substantially diminish the load-bearing resistance. This study numerically investigates the seismic bearing capacity and failure mechanisms of skirted strip footings resting on cohesive soil slopes using the finite element limit analysis. A comprehensive parametric analysis is performed to examine the influence of soil strength, skirt depth, slope angle, and horizontal seismic acceleration on the bearing capacity factor and deformation pattern of the footing. The results indicate that skirts significantly enhance load carrying capacity under seismic loading by increasing shear resistance, delaying footing collapse comprising the slope face failure, and increasing the bearing capacity factor by up to 142% in very stiff clay. Failure mechanism analysis shows a transformation from shallow, asymmetric failures in footing without skirt to the conditions to deeper Prandtl-type mechanisms with skirts, demonstrating their effectiveness in improving foundation stability under seismic loading on cohesive slopes.</p>

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Seismic bearing capacity of skirted footings on cohesive slopes using limit analysis

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Sweta Verma,
  • Saswati Datta,
  • Vinay Bhushan Chauhan

摘要

The seismic bearing capacity of shallow foundations located near slope crests remains a critical concern in geotechnical engineering, where complex slope foundation interactions can substantially diminish the load-bearing resistance. This study numerically investigates the seismic bearing capacity and failure mechanisms of skirted strip footings resting on cohesive soil slopes using the finite element limit analysis. A comprehensive parametric analysis is performed to examine the influence of soil strength, skirt depth, slope angle, and horizontal seismic acceleration on the bearing capacity factor and deformation pattern of the footing. The results indicate that skirts significantly enhance load carrying capacity under seismic loading by increasing shear resistance, delaying footing collapse comprising the slope face failure, and increasing the bearing capacity factor by up to 142% in very stiff clay. Failure mechanism analysis shows a transformation from shallow, asymmetric failures in footing without skirt to the conditions to deeper Prandtl-type mechanisms with skirts, demonstrating their effectiveness in improving foundation stability under seismic loading on cohesive slopes.