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<p>Bearing capacity of footings is governed by the strength parameters and the settlement of soil. Load-settlement response is nonlinear for footings resting on soft ground, characterized by its compressibility. Natural deposits exhibit a complex variation of undrained shear strength with depth, influenced by factors such as stress history, climatic and environmental exposure, etc. Desiccation caused by alternate wetting and drying and/or alternate heating and cooling of the top layer of soft soil can significantly affect the strength profile (undrained strength variation with depth) of soft ground. The present study analyzes footings resting on dense granular fill over desiccated normally consolidated deposit (GDNC), accounting for both material and stress-induced nonhomogeneity. Finite element axisymmetric analysis is carried out to evaluate the bearing pressure versus settlement responses for footings on three-layered soil system. This study aims to assess the influence of nonhomogeneity within the desiccated layer on bearing pressure–settlement responses of footing resting on GDNC for various crust thicknesses. The effect of nonhomogeneity in the desiccated layer on bearing pressure increases with the settlement and is significant at large settlements. An equation to compute the bearing pressure of circular footing for a specific settlement resting on GDNC is proposed based on finite element analysis. The results are applied to a circular footing resting on GDNC ground to illustrate the practical implications.</p>

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Influence of Desiccation on Bearing Pressure–Settlement Behavior of Circular Footings on Granular Bed Overlying Nonhomogeneous Ground

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • J. Y. V. Shiva Bhushan,
  • G. V. Narasimha Reddy,
  • Madhira R. Madhav

摘要

Bearing capacity of footings is governed by the strength parameters and the settlement of soil. Load-settlement response is nonlinear for footings resting on soft ground, characterized by its compressibility. Natural deposits exhibit a complex variation of undrained shear strength with depth, influenced by factors such as stress history, climatic and environmental exposure, etc. Desiccation caused by alternate wetting and drying and/or alternate heating and cooling of the top layer of soft soil can significantly affect the strength profile (undrained strength variation with depth) of soft ground. The present study analyzes footings resting on dense granular fill over desiccated normally consolidated deposit (GDNC), accounting for both material and stress-induced nonhomogeneity. Finite element axisymmetric analysis is carried out to evaluate the bearing pressure versus settlement responses for footings on three-layered soil system. This study aims to assess the influence of nonhomogeneity within the desiccated layer on bearing pressure–settlement responses of footing resting on GDNC for various crust thicknesses. The effect of nonhomogeneity in the desiccated layer on bearing pressure increases with the settlement and is significant at large settlements. An equation to compute the bearing pressure of circular footing for a specific settlement resting on GDNC is proposed based on finite element analysis. The results are applied to a circular footing resting on GDNC ground to illustrate the practical implications.