In hilly terrains, the construction of footings on the slopes of these terrains is frequently encountered. Compared to a foundation resting on level ground, foundations built on slopes behave in a complex manner depending upon the position of the footing and the steepness of the slope. In addition, the effect of stress state in field conditions and varying climatic changes throughout the year affects the degree of saturation of the slopes considerably influencing the severity of the problem significantly. The load-carrying capacity of such footings, therefore, must be evaluated carefully to avoid disastrous effects. In the present study, an attempt has been made to evaluate the load-carrying capacity of a strip footing resting on a slope under the influence of varying climatic conditions throughout the year. Appropriate dimensions and domain size for the slope and the footing were selected from the literature. To simulate the effect of stress state and climatic conditions, the stress-dependent soil water characteristic curves (SWCC) for the chosen soil slope determined through various experimental methods were utilized in the analysis. The load-carrying capacity of the footing was determined through a coupled analysis of flux flow and slope stability in commercial finite element software (SVOffice). Further, a short parametric study was carried out by varying the distance between the crest of the slope and the end of the footing to study the influence of footing placement on the load-carrying capacity. Finally, based on the parametric study, design charts were presented to comprehend the effect of stress state and varying climatic changes in the analysis of the load-carrying capacity of footings on hilly terrains. It was noted that the load capacity of the footing significantly reduced in the post-monsoon period.

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Load Capacity of a Footing on an Unsaturated Soil Slope Considering Stress-Dependent SWCC

  • Chidanand M. Jadar,
  • Sathiyamoorthy Rajesh,
  • Suman Roy

摘要

In hilly terrains, the construction of footings on the slopes of these terrains is frequently encountered. Compared to a foundation resting on level ground, foundations built on slopes behave in a complex manner depending upon the position of the footing and the steepness of the slope. In addition, the effect of stress state in field conditions and varying climatic changes throughout the year affects the degree of saturation of the slopes considerably influencing the severity of the problem significantly. The load-carrying capacity of such footings, therefore, must be evaluated carefully to avoid disastrous effects. In the present study, an attempt has been made to evaluate the load-carrying capacity of a strip footing resting on a slope under the influence of varying climatic conditions throughout the year. Appropriate dimensions and domain size for the slope and the footing were selected from the literature. To simulate the effect of stress state and climatic conditions, the stress-dependent soil water characteristic curves (SWCC) for the chosen soil slope determined through various experimental methods were utilized in the analysis. The load-carrying capacity of the footing was determined through a coupled analysis of flux flow and slope stability in commercial finite element software (SVOffice). Further, a short parametric study was carried out by varying the distance between the crest of the slope and the end of the footing to study the influence of footing placement on the load-carrying capacity. Finally, based on the parametric study, design charts were presented to comprehend the effect of stress state and varying climatic changes in the analysis of the load-carrying capacity of footings on hilly terrains. It was noted that the load capacity of the footing significantly reduced in the post-monsoon period.