By Zhongxuan Yang, Richard Jardine, Wangbo Guo, Fiona Chow
A finished Database of assessments on Axially Loaded pushed Piles in Sands stories the serious have to strengthen greater load-test databases for piles pushed in sands. the main caliber parameters, inhabitants of present entries and reporting codecs are defined earlier than supplying initial effects acquired from comparisons among axial capacities calculated by means of a number of predictive ways and placement measurements. This ebook additionally exhibits that the "simplified" and "offshore" ICP and UWA variations proposed by means of a few practitioners are over-conservative and that their use might be discontinued. the recent pile ability and stiffness database deals a large scope for comparing capability prediction biases with regards to a variety of soil and pile parameters. Submission of additional prime quality checks for inclusion in frequently up to date models is encouraged.
- Presents a finished and up-to-date database for piles pushed in predominantly silica sands
- Features experiences of the layout systems for pushed piles in sand
- Assesses the functionality of varied mainstreams layout methods utilized for piles pushed in sand
- Provides entire details of case histories of pile load tests
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Additional info for A Comprehensive Database of Tests on Axially Loaded Piles Driven in Sand
1 Relative Density Dr Relative density Dr is employed in the API-2014, ICP-05, and NGI-05 calculations for various purposes. The following empirical relationship proposed by Jamiolkowski et al. 2 Incremental Filling Ratio and Final Filling Ratio Both incremental filling ratio (IFR) and final filling ratio (FFR) pile coring parameters are used in the full UWA-05 procedures for open-ended piles. 3) where ΔLp is the increment of soil plug length, and Δz is the increment of the pile penetration. Ideally, IFR should be recorded during driving.
3 Interface Shearing Angle δf The constant volume (ultimate) interface shearing angle δf used in ICP-05 and UWA-05 or their simplified versions is a key parameter that can vary with sand grain size, shape, and mineral type as well as the hardness and roughness of the pile surface. Site-specific ring shear tests provide the most reliable data. However, Jardine and Chow (1996) originally recommended that if such tests are unavailable, trends for δf with grain d50 could be used to provide estimates, and reported curves from constant normal stress direct shear tests on a range of clean standard sands shearing against steel interfaces prepared with initial Ra values between 6 and 10 μm, after Jardine et al.
Concrete interfaces do not necessarily develop the same interface angles as those made of steel. 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.