A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of installation advancement rate on helical pile helix behavior in very dense sand
https://orcid.org/http://orcid.org/0000-0003-3026-1642
https://orcid.org/http://orcid.org/0000-0002-7224-7219
https://orcid.org/http://orcid.org/0000-0001-7543-9083
During installation, the helical pile should penetrate into the ground at a rate equal to one helix pitch per rotation to prevent additional soil disturbance, as usually recommended in installation guides; however, in the field this is frequently difficult to achieve. To have a better understanding of the effects of the advancement rate (AR) on the installation torque and helix bearing capacity, six calibration chamber tests were performed on an instrumented single-helix pile installed in very dense sand using three different AR values (0.8, 1 and 1.2). For the range tested, the results indicated that AR affects the uplift and compressive capacity of the pile helix. A reduction in compressive capacity of 24% on average was observed for AR of 0.8, compared to the recommended pitch matched installation (AR = 1), while for AR of 1.2, the compressive capacity increased 12% on average. In uplift, the capacity variation was about − 26% and + 6%, respectively, for AR of 0.8 and 1.2 compared to the pitch matched installation case. The effect of AR was also observed for the capacity-to-torque factor related to the helix portion of a deep helical pile and suggests the necessity for monitoring AR to ensure the applicability of the torque factor for pile capacity control.
Effects of installation advancement rate on helical pile helix behavior in very dense sand
https://orcid.org/http://orcid.org/0000-0003-3026-1642
https://orcid.org/http://orcid.org/0000-0002-7224-7219
https://orcid.org/http://orcid.org/0000-0001-7543-9083
During installation, the helical pile should penetrate into the ground at a rate equal to one helix pitch per rotation to prevent additional soil disturbance, as usually recommended in installation guides; however, in the field this is frequently difficult to achieve. To have a better understanding of the effects of the advancement rate (AR) on the installation torque and helix bearing capacity, six calibration chamber tests were performed on an instrumented single-helix pile installed in very dense sand using three different AR values (0.8, 1 and 1.2). For the range tested, the results indicated that AR affects the uplift and compressive capacity of the pile helix. A reduction in compressive capacity of 24% on average was observed for AR of 0.8, compared to the recommended pitch matched installation (AR = 1), while for AR of 1.2, the compressive capacity increased 12% on average. In uplift, the capacity variation was about − 26% and + 6%, respectively, for AR of 0.8 and 1.2 compared to the pitch matched installation case. The effect of AR was also observed for the capacity-to-torque factor related to the helix portion of a deep helical pile and suggests the necessity for monitoring AR to ensure the applicability of the torque factor for pile capacity control.
Effects of installation advancement rate on helical pile helix behavior in very dense sand
https://orcid.org/http://orcid.org/0000-0003-3026-1642
https://orcid.org/http://orcid.org/0000-0002-7224-7219
https://orcid.org/http://orcid.org/0000-0001-7543-9083
During installation, the helical pile should penetrate into the ground at a rate equal to one helix pitch per rotation to prevent additional soil disturbance, as usually recommended in installation guides; however, in the field this is frequently difficult to achieve. To have a better understanding of the effects of the advancement rate (AR) on the installation torque and helix bearing capacity, six calibration chamber tests were performed on an instrumented single-helix pile installed in very dense sand using three different AR values (0.8, 1 and 1.2). For the range tested, the results indicated that AR affects the uplift and compressive capacity of the pile helix. A reduction in compressive capacity of 24% on average was observed for AR of 0.8, compared to the recommended pitch matched installation (AR = 1), while for AR of 1.2, the compressive capacity increased 12% on average. In uplift, the capacity variation was about − 26% and + 6%, respectively, for AR of 0.8 and 1.2 compared to the pitch matched installation case. The effect of AR was also observed for the capacity-to-torque factor related to the helix portion of a deep helical pile and suggests the necessity for monitoring AR to ensure the applicability of the torque factor for pile capacity control.
Effects of installation advancement rate on helical pile helix behavior in very dense sand
Acta Geotech.
Annicchini, Matheus Morato (author) / Schiavon, José Antonio (author) / Tsuha, Cristina de Hollanda Cavalcanti (author)
Acta Geotechnica ; 18 ; 2795-2811
2023-05-01
17 pages
Article (Journal)
Electronic Resource
English
Helical screw pile , Offshore foundations , Physical modeling , Pile installation effect , Sands , Soil disturbance Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Single Helix Screw Pile Behavior Under Compressive Loading/Unloading Cycles in Dense Sand
| Online Contents | 2020
Monitoring the Installation and Curing of a Large Diameter ACIP Pile in Very Dense Sand
| British Library Conference Proceedings | 2007
| British Library Online Contents | 2018