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Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles
https://orcid.org/http://orcid.org/0000-0002-8574-0889
https://orcid.org/http://orcid.org/0000-0003-0521-8001
The excavation method has significant effects on the response of piles, and post-grouting is a great way to improve the response of piles. In this research, field static load tests were performed on three large-diameter and superlong rock-socketed bored piles (LSRBPs) of superhigh-rise constructions. The effects of composite excavation and combined grouting on the response of LSRBPs were studied. The improved effects of combined grouting on LSRBPs that were drilled by composite excavation were discussed. The results indicate that the composite excavation improves construction efficiency but affects shaft-forming quality, thus lowering the bearing capacity of LSRBPs, while combined grouting can contain this defect. Despite reducing the original pile size, combined grouting still significantly improves the bearing capacity of LSRBS and reduces the dispersion of bearing capacity. Existing pile design methods overestimate the bearing capacity of LSRBPs constructed using composite excavation, but underestimate it after combined grouting. The composite excavation forms different pile-rock (soil) interfaces, which affects the effectiveness of combined grouting. The simultaneous application of composite excavation and combined grouting reduces design pile size and improves construction efficiency, thereby achieving the goals of cost reduction and low-carbon construction. The findings have significant implications for the construction and design of LSRBPs.
Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles
https://orcid.org/http://orcid.org/0000-0002-8574-0889
https://orcid.org/http://orcid.org/0000-0003-0521-8001
The excavation method has significant effects on the response of piles, and post-grouting is a great way to improve the response of piles. In this research, field static load tests were performed on three large-diameter and superlong rock-socketed bored piles (LSRBPs) of superhigh-rise constructions. The effects of composite excavation and combined grouting on the response of LSRBPs were studied. The improved effects of combined grouting on LSRBPs that were drilled by composite excavation were discussed. The results indicate that the composite excavation improves construction efficiency but affects shaft-forming quality, thus lowering the bearing capacity of LSRBPs, while combined grouting can contain this defect. Despite reducing the original pile size, combined grouting still significantly improves the bearing capacity of LSRBS and reduces the dispersion of bearing capacity. Existing pile design methods overestimate the bearing capacity of LSRBPs constructed using composite excavation, but underestimate it after combined grouting. The composite excavation forms different pile-rock (soil) interfaces, which affects the effectiveness of combined grouting. The simultaneous application of composite excavation and combined grouting reduces design pile size and improves construction efficiency, thereby achieving the goals of cost reduction and low-carbon construction. The findings have significant implications for the construction and design of LSRBPs.
Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles
https://orcid.org/http://orcid.org/0000-0002-8574-0889
https://orcid.org/http://orcid.org/0000-0003-0521-8001
The excavation method has significant effects on the response of piles, and post-grouting is a great way to improve the response of piles. In this research, field static load tests were performed on three large-diameter and superlong rock-socketed bored piles (LSRBPs) of superhigh-rise constructions. The effects of composite excavation and combined grouting on the response of LSRBPs were studied. The improved effects of combined grouting on LSRBPs that were drilled by composite excavation were discussed. The results indicate that the composite excavation improves construction efficiency but affects shaft-forming quality, thus lowering the bearing capacity of LSRBPs, while combined grouting can contain this defect. Despite reducing the original pile size, combined grouting still significantly improves the bearing capacity of LSRBS and reduces the dispersion of bearing capacity. Existing pile design methods overestimate the bearing capacity of LSRBPs constructed using composite excavation, but underestimate it after combined grouting. The composite excavation forms different pile-rock (soil) interfaces, which affects the effectiveness of combined grouting. The simultaneous application of composite excavation and combined grouting reduces design pile size and improves construction efficiency, thereby achieving the goals of cost reduction and low-carbon construction. The findings have significant implications for the construction and design of LSRBPs.
Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles
Acta Geotech.
Hu, Tao (author) / Dai, Guoliang (author) / Wan, Zhihui (author) / Gong, Weiming (author) / Fang, Bowen (author)
Acta Geotechnica ; 19 ; 1853-1871
2024-04-01
19 pages
Article (Journal)
Electronic Resource
English
Combined side-and-tip grouting , Composite excavation method , Field static load tests , Large-diameter and superlong bored piles , Post-grouting rock-socketed piles Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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