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Establishing and Investigating Foundation Zones of Influence

Introduction Determining a reasonable depth for the zone of influence is required during the design phase of construction projects to estimate the amount of settlement a structure may undergo due to the proposed change in loading to the subgrade. This method commonly known as the Boussinesq [′bü·si′nesk] method is widely used throughout the geotechnical industry. In addition to estimating the settlement of structures supported on shallow foundations this method is also used to determine what influence a foundation may have on neighboring structures. Because this method is well-established for use in estimating the zone of soil affected or influenced by the structure it seems reasonable to conclude that this method could be used to determine the zone of soil acting to support or influence the structure. In other words, the Boussinesq method is a pre-construction design tool that can be reconfigured for use as a post-construction analysis tool. As an analysis tool this modified Boussinesq equation could then be used to determine the impact of post-construction events or activities acting on the soils within the zone of influence. This paper serves to introduce and explain the Boussinesq method used for design. This paper then breaks down the basic equation and reconfigures it plugging in known values so as to solve for and ultimately determine the zone of soil acting to support or influence the structure. These findings are then presented graphically and in table format for use in ongoing analysis efforts. This paper concludes with a discussion of future efforts intended to be conducted so as to further refine the Boussinesq method used for analysis. Specifically, the basis for each of the equations assumptions will be explored and actual in situ testing performed so as to develop tabularized values for use.