Geotechnical Engineering Circular No. 9 Design, Analysis, and Testing of Laterally Loaded Deep Foundations that Support Transportation Facilities
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- 6.7.1 Selection of Deep Foundation Type and Size
| 6.7 OTHER DESIGN CONSIDERATIONS This section presents additional design considerations for analysis of laterally loaded single deep foundation elements. The topics presented in this section generally apply to more complex loading conditions, problem geometry, or subsurface conditions, and therefore are generally not applicable to the Broms method for simple analyses as previously discussed. Therefore, the considerations discussed herein are presented assuming the applicability of the p-y method. 6.7.1 Selection of Deep Foundation Type and Size As discussed in Chapter 5, one of the key steps in the design of laterally loaded deep foundations is the selection of the deep foundation type. In some projects, the selection of a deep foundation maybe dictated by project conditions, project type, or local practice. For example, an area with limited footing space maybe designed with a single drilled shaft foundation because of that restriction, or a pile and lagging wall maybe the only viable wall type fora particular site. However, in many projects, the design of a deep foundation to resist lateral loads will have multiple types of foundations and sizes that will produce a satisfactory technical result. The solution fora deep foundation that has adequate resistance and tolerable deflections to applied lateral loads is a combination of the type of foundation (steel pile, concrete pile, drilled shaft, micropile, etc, the size (width or diameter, the depth of embedment, and the number of elements used to resist the load (whether the problem is adequately addressed as an individual element or if a group of elements is considered. As previously noted, p-y curves area function of the pile type, size, and soil conditions, and the soil response varies with depth. Therefore, it is generally found that multiple solutions regarding foundation type and size can be developed fora given project condition. Design of individual deep foundations for lateral load applications often involves an iterative process of evaluating different types, sizes, and depths of individual foundation elements to determine which combinations will produce satisfactory results. The computer software programs for p-y analyses make evaluating multiple foundation types and sizes relatively easy and straightforward. Download 6.03 Mb. Share with your friends:
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