• GEOWEB Infill: A list of common granular material is available to choose from, and the material properties can be edited as necessary. On-site salvaged material can be used, even if it is poor quality, and a vegetated, grass-surface option is also available if desired. If on-site material is selected, the fines content (passing a 200 sieve) should be limited to less than 10 percent. • Subgrade Below GEOWEB: The strength of the subgrade below the GEOWEB system is a driving factor in the total required cross section. The weaker the subgrade, the greater the effect the GEOWEB System will have on the overall cross section. The project geotechnical engineer should be consulted to determine a representative CBR value. • Required Information: Emergency access loading is covered by AASHTO H/HS20 standards, with the wheel load and tire pressure shown. A geotextile under the GEOWEB panels is recommended to help prevent material loss, especially in soft soil environments. The desired Factor of Safety may be adjusted to account for project specific conditions as needed. • Hoop Stress Check: This is an un-editable section that shows the Factor of Safety (FoS) for the mechanical performance characteristics of the geocell system in response to user-input load conditions. The hoop stress check verifies protection against the most common modes of failure including shearing, splitting, and peeling of mechanical and internal junctions, can impact long term performance of the system. As the calculation progresses, the Calculated Factor of Safety is continually updated to show if the cross-section is acceptable or needs adjustment. The cross-section diagram gives a real- time indication of the different layers used in the calculation.
Figure 1
Once an Acceptable Factor of Safety is achieved, the results can be downloaded and printed. (Figure 1) The results page includes the customizable fields for project name and company information, and a short description of the calculation method. The calculation information is shown in an easy-to-read format with clear indication of an acceptable result. This results page can now be included in project plans, added to bidding documents, and shared with colleagues and clients. When the project is ready to move to the next phase, contact Presto Geosystems for information about pricing and local distribution. Additional Value Engineering Options with the Presto Geo P 3 Portal In addition to the GEOWEB geocell calculations, the P 3 Project Planning Portal offers calculations for both porous pavements and site access alternatives. Porous pavements can be either aggregate or vegetated and can support full AASHTO H/HS25 loadings. Site access options include both temporary and permanent solutions depending on project needs. The Presto Geo P 3 Portal also serves as a comprehensive resource hub. With access to a vast library of technical documents and product resources, you can deepen your industry knowledge, stay up to date with the latest product advancements, and make more informed decisions when it comes to your projects. Designed to revolutionize project planning and execution, the Presto Geo P 3 Portal empowers you to build smarter, faster, and more sustainably.
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October 2023 csengineermag.com
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