By Zhongxuan Yang, Richard Jardine, Wangbo Guo, Fiona Chow
A accomplished Database of checks on Axially Loaded pushed Piles in Sands stories the serious have to increase higher load-test databases for piles pushed in sands. the major caliber parameters, inhabitants of present entries and reporting codecs are defined ahead of delivering initial effects got from comparisons among axial capacities calculated via quite a few predictive ways and placement measurements. This e-book additionally indicates that the "simplified" and "offshore" ICP and UWA versions proposed via a few practitioners are over-conservative and that their use will be discontinued. the hot pile capability and stiffness database deals a extensive scope for comparing strength prediction biases with regards to a variety of soil and pile parameters. Submission of extra prime quality exams for inclusion in frequently up-to-date types is encouraged.
- Presents a finished and up to date database for piles pushed in predominantly silica sands
- Features experiences of the layout tactics for pushed piles in sand
- Assesses the functionality of varied mainstreams layout tactics utilized for piles pushed in sand
- Provides entire details of case histories of pile load tests
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Extra info for A Comprehensive Database of Tests on Axially Loaded Piles Driven in Sand
Ring shear experiments reported by Barmpopoulos et al. 2. The suggested trend supports an assumption for rough piles of δf = 29° which coincidentally matches the default value proposed for steel piles in the Fugro-05 method. However, site-specific ring shear interface tests remain the recommended ICP approach for establishing δf values for any given practical application. 4 Soil Unit Weight γ and Water Table The unit weight of soil γ is used to calculate the overburden effective stress. While values for γ can be often found in site investigation reports, they may be affected by sampling disturbance.
A new point to emerge is that the “simplified” ICP method is notably overconservative for the piles in the ZJU-ICL database. We recommend that future onshore and offshore applications should adopt the “full” formulation set out by Jardine et al. (2005), as endorsed in practical onshore and offshore projects by Williams et al. (1997) and Overy (2007). The preliminary analysis also highlights the significance of pile age on shaft and total capacity. It is clear that this key aspect of behavior has to be addressed in any testing or updating of design methods.
4 Soil Unit Weight γ and Water Table The unit weight of soil γ is used to calculate the overburden effective stress. While values for γ can be often found in site investigation reports, they may be affected by sampling disturbance. Checks are therefore made against the relative densities expected from the CPT profiles, and a default value of 19 kN/m3 is adopted if credible site-specific data are not available. It is also imperative that the groundwater table is known from piezometers, standpipes, piezocone, or drilling measurements.