Jul 2, 2015 NSF has been reported to cause excessive settlement of piles [defined as “ downdrag” by Fellenius (1999)], differential settlement, and additional 

Corpus ID: 208305430. Results from long-term measurement in piles of drag force and downdrag @inproceedings{Fellenius2006ResultsFL, title={Results from long-term measurement in piles of drag force and downdrag}, author={B. Fellenius}, year={2006} }

According to Fellenius, this value will adequately predict the downdrag load. Based on pile-uplift test results, Machan and Squier (2), mea­ sured 90 percent reduction in downdrag forces on bitumen-coated piles. When downdrag was predicted using bitumen viscosity, the forces were lower than the field measurements. Dragload_Downdrag_1.pdf: Asian Journal Discussion on the design for dragload and downdrag (settlement) on piles with recommendation summary. Dragload_Downdrag_2.pdf: The basics of the Fellenius Unified Pile Design of Capacity, Negative Skin Friction (Dragload and Downdrag), and Settlement. If you go to Fellenius's website he has several papers on downdrag, which occurs in all soils and only effects the structural capacity of the pile. It is the frictional capacity of the soil above the neutral plane.

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4 feb. 2016 — Bengt H. Dragload-Downdrag- Bengt H. Fellenius, April 1998 Page 4 Fig. 3. Pile shortening · Documents · DPT-RP1/DPT-CP1 | Help Guide  Bengt H. Dragload-Downdrag- Bengt H. Fellenius, April 1998 Page 4 Fig. 3. Pile shortening · Documents · Enrique portfolio 2013.pptx · Business · Enrique Díaz  Bengt H. Dragload-Downdrag-Settlement.pdf Bengt H. Fellenius, April. Bengt H. Dragload-Downdrag-Settlement.pdf Bengt H. Category: Documents.

Fellenius, B. H. and Siegel, T.C. (2008). Pile drag load and downdrag in a liquefaction event J. Geotech. and Geoenvir. Engrg. ASCE, Reston, Virginia, 134 (9), 

Pile drag load and downdrag in a liquefaction event J. Geotech. and Geoenvir. Engrg.

This study presents an analytical method to quantify the effects of -induced liquefaction downdrag on drilled shafts. The analytical method is based on the neutral plane method originally developed for clays but modified to account for liquefaction-induced effects.

However, to avoid confusion with other connotations of  Poulos, 2008; Fellenius, 2017), geotechnical failure implies that the entire pile moves past the soil Analysis of downdrag on pile groups, Géotechnique, Vol. Aug 6, 2015 a down drag condition, the calculation of the down-drag on piles.

Fellenius and Siegel (2008) questioned the validity of the AASHTO Specifications in case of liquefaction-induced downdrag. Fellenius and Siegel (2008) applied the unified method (Fellenius 1984; 2004; 2020) to pile analysis to account for seismic liquefaction effects. Bengt H. Fellenius on “Downdrag Settlement a Single Floating Pile” authored by W.H. Ting Published in Geotechnical Engineering, Vol. 31, No. 2, pp. 83 - 90. The Author addresses the calculation of the settlement of a single pile in a compressible soil layer due to a fill on the ground surface.
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directional (O-cell) tests, high-strain dynamic testing and the principles of Fellenius’ Unified Design Method for downdrag, drag force, settlement and capacity for single piles and small (narrow) pile groups were used to demonstrate that the piles only needed to penetrate 1.5 m (5 ft)

, Bozozuk , and Indraratna et al. performed field measurements on instrumented piles. These measurements revealed that the dragload value may be large enough to cause pile structural failure. Also, the downdrag may lead to serviceability problems.
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Keywords: negative friction, down-drag, consolidation, pile group, settlement, case study. ABSTRACT: Pile design Fellenius (2004) proposed a unified method.

Fellenius and Siegel (2008) applied the unified method (Fellenius 1984; 2004; 2020) to pile analysis to account for seismic liquefaction effects. Bengt H. Fellenius on “Downdrag Settlement a Single Floating Pile” authored by W.H. Ting Published in Geotechnical Engineering, Vol. 31, No. 2, pp. 83 - 90. The Author addresses the calculation of the settlement of a single pile in a compressible soil layer due to a fill on the ground surface. Fellenius (1972) developed the NP method to estimate drag load and downdrag for piles in clay. Boulanger and Brandenberg (2004) later modified the NP method for its application to liquefaction (Fellenius, 1989; Fellenius, 1998) as the objective herein is to provide a rational, alternative design approach for consideration of drag load and downdrag within the LRFD The AASHTO Specifications explicitly note four conditions for where drag load may develop; however, as described herein, drag load will In their study, downdrag was correlated incrementally over time in parallel with the pore pressure dissipation.Also, Fellenius and Siegel (2008) applied the concepts of ‘unified method’ (Fellenius 19842014) to, 2004, study the effects of seismic liquefaction on downdrag.

Mar 25, 2016 Presence of negative skin friction or downdrag causes an additional Fellenius. [2,3,4], Blanchet et al. [5] and Indraratna et al. [6] conducted 

dragload-downdrag- bengt h. fellenius, april 1998 Documents · bengt johansson - missa a quatro voci · Documents · bengt af klintberg - monoskop  session 52 bengt stålner · Documents · Bengt H. Dragload-Downdrag- Bengt H. Fellenius, April 1998 Page 4 · bengt h. dragload-downdrag- bengt h. fellenius,  Briaud, Jean-Louis (författare); Design and construction guidelines for downdrag on uncoated and bitumen-coated piles / Jean-Louis Briaud and Larry Tucker. 13 feb.

Telephone: (778) 426-0775. Email: Bengt (at) Fellenius (dot) net. I apologize for not having replied to those who have tried to connect to me via Linked-In, Research-Gate, and other such sites. However, I do not participate in these social networks (not even Facebook).