Field test research on post-grouting effect for super-long cast-in-place bored pile in thick soft foundation

The field static load test method was adopted for two test piles in a project in Zhejiang area of China, analyze the effect of post-grouting technique on super-long cast-in-place bored pile and its internal mechanism. Q-s curves and pile axial force curves were drawn based on test data to show that...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2021-10, Vol.39 (7), p.4833-4842
Main Authors: Cui, Yun-liang, Qi, Chang-guang, Zheng, Jin-hui, Wang, Xin-quan, Zhang, Shi-min
Format: Article
Language:English
Subjects:
Axial forces
Bearing capacity
Bored piles
Boring
Cast in place
Civil Engineering
Compression
Earth and Environmental Science
Earth Sciences
Field tests
Friction
Geotechnical Engineering & Applied Earth Sciences
Grouting
Hydrogeology
Load tests
Original Paper
Pile bearing capacities
Piles
Skin
Skin friction
Soil
Soil layers
Soils
Static loads
Terrestrial Pollution
Waste Management/Waste Technology
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Summary:The field static load test method was adopted for two test piles in a project in Zhejiang area of China, analyze the effect of post-grouting technique on super-long cast-in-place bored pile and its internal mechanism. Q-s curves and pile axial force curves were drawn based on test data to show that post-grouting technique played a prominent role in improving bearing capacity of single pile and pile skin friction. In addition, pile skin friction at upper soil layer around super-long pile was fully used, but that at lower soil layer was not. For the design of super-long pile, the compression of pile body should be considered to make the best use of pile skin friction caused by relative displacement between pile and soil.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-021-01796-x