Results 241 to 250 of about 7,922 (288)

Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils

Bulletin of Engineering Geology and the Environment, 2021
In recent years, the use of helical piles as a deep foundation option for structures has increased dramatically because they offer definite advantages over other solutions. The present study undertook a comprehensive investigation of the axial compressive behavior of helical piles in both sandy and clayey types of soil using finite element (FE ...
Mohammadreza Jahanshahi Nowkandeh, Askar Janalizadeh Choobbasti   +1 more
exaly   +2 more sources

Cyclic load behavior of helical pile-to-pile cap connections subjected to uplift loads

Engineering Structures, 2021
Abstract Although significant research has been conducted on helical piles, there is a lack of research and official design guidelines on how to create resilient helical pile-to-pile cap connections, especially in tall and light structures where tensile uplift loads may govern the foundation design.
Serhan Guner
exaly   +2 more sources

Physical modelling of helical pile anchors

International Journal of Physical Modelling in Geotechnics, 2007
Helical piles design is based usually on empirical correlations between the uplift capacity and the torque resistance of the pile during installation. A simplified theoretical relationship to predict the uplift capacity of deep helical piles in sand from the installation torque was reported.
Tsuha, Chc, Aoki, N., Rault, Gérard, Thorel, Luc, Garnier, Jacques   +4 more
openaire   +2 more sources

Helical Piles as a Novel Foundation System for Offshore Piled Facilities

Abu Dhabi International Petroleum Exhibition and Conference, 2015
Abstract Driven piles are used to support the majority of offshore oil and gas structures with jacket structures supported by axially loaded piles still remaining the most common form of fixed offshore platform. Piles for conventional platforms are normally driven open-ended steel piles.
G. Spagnoli, K. Gavin
openaire   +1 more source

Performance of Helical Piles with Grouted Shafts

New Technological and Design Developments in Deep Foundations, 2000
A new foundation system employing in-situ grouting of helical screw piles has recently been developed. As the anchor is installed into the soil, a column of grout is "pulled down" around the anchor shaft providing an in-situ grouted shaft. This foundation system has been successfully employed at several sites with very soft soils overlying a more ...
Robert A. Vickars, Samuel P. Clemence
openaire   +1 more source

The occurrence of residual stresses in helical piles

2015
Residual stresses generated during the pile installation are usually observed and considered in the interpretation of conventional pile load tests. However, in the case of helical piles, residual stresses can be generated by previous loadings. At the end of the unloading stage in tension tests, the shaft resistance is reversed, and the helices are ...
Schiavon, José A., dos Santos Filho, João M.S.M., de H. C. Tsuha, Cristina, Thorel, Luc   +3 more
openaire   +1 more source

Lateral Capacity of Helical Piles in Clays

Journal of Geotechnical Engineering, 1996
In this paper, the behavior of helical piles under lateral loads in clayey soils is examined through an experimental investigation on model piles. Tests were conducted on rigid helical piles with different numbers of plates. Model anchors were made of 13.8 mm diameter mild steel shafts to which mild steel plates of 33 mm diameter were welded.
Yenumula V. S. N. Prasad, S. Narasimha Rao   +1 more
openaire   +1 more source

Axial Performance of Helical Tapered Piles in Sand

Geotechnical and Geological Engineering, 2017
The axial capacity of novel spun-cast ductile iron (SCDI) tapered pile fitted with a lower helical plate is investigated. Seven instrumented piles, five SCDI tapered and two steel straight shafts, were installed in sand soil using mechanical torque. The piles were tested under axial compressive loading and their ultimate capacities were determined.
Ahmed Fahmy, M. Hesham El Naggar
openaire   +1 more source

Performance-Based Design Method for Multiple Helices of Helical Pile in Cohesionless Soil

Transportation Research Record: Journal of the Transportation Research Board, 2022
Multiple helices are being used frequently in helical pile applications nowadays. This paper presents multiple helices on simplified field design charts for small diameter helical piles that relate service compressive load and soil parameters as a group with the pile parameters.
Nur Mohammad Shuman, Mohammad Sadik Khan, Farshad Amini   +2 more
openaire   +1 more source

Physical modelling of helical screw piles in sand

2010
Empirical correlations between installation torque and uplift capacity of helical screw piles are frequently employed as a procedure for on site quality control of this type of foundation. In this work a theoretical relationship between uplift capacity and installation torque of deep helical screw piles in sand is proposed.
de Hollanda Cavalcanti Tsuha, C., Aoki, N., Rault, Gérard, Thorel, Luc, Garnier, Jacques   +4 more
openaire   +3 more sources