FIELD TEST STUDY ON UPLIFT BEARING CHARACTERISTICS OF CONCRETE BELLED PILES IN SANDSTONE STRATA

YANG Bai; XIAO Shiguo; MA Jianlin; LIU Baochen; SU Chunhui

doi:10.13204/j.gyjzG20040902

Volume 51 Issue 4

Aug. 2021

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YANG Bai, XIAO Shiguo, MA Jianlin, LIU Baochen, SU Chunhui. FIELD TEST STUDY ON UPLIFT BEARING CHARACTERISTICS OF CONCRETE BELLED PILES IN SANDSTONE STRATA[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(4): 132-138,147. doi: 10.13204/j.gyjzG20040902

Citation:

YANG Bai, XIAO Shiguo, MA Jianlin, LIU Baochen, SU Chunhui. FIELD TEST STUDY ON UPLIFT BEARING CHARACTERISTICS OF CONCRETE BELLED PILES IN SANDSTONE STRATA[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(4): 132-138,147. doi: 10.13204/j.gyjzG20040902

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FIELD TEST STUDY ON UPLIFT BEARING CHARACTERISTICS OF CONCRETE BELLED PILES IN SANDSTONE STRATA

doi: 10.13204/j.gyjzG20040902

1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 2020-04-09
Available Online: 2021-08-19

Abstract

Abstract

In order to study the uplift bearing characteristics of the rock-socketed belled pile in sandstone strata, based on the 500 kV double-circuit line project of State Grid, load tests for aixal uplift piles in situ for rock-socketed belled piles were conducted, and the characteristics of the side friction resistance and axial force of piles were obtained, and then a simplified calculation method for the ultimate bearing capacity of rock-socketed belled pile was proposed. The results of field tests showed that the curves of uplift loads and displacement for rock-socketed belled piles were steep, to increase the pile length could effectively improve the ultimate uplift bearing capacity of uplift piles, but with the increase of the pile length, the effect of belled end would decrease and the load bearing ratios of the pile tips and pile shafts gradually decreased from 69.9% to 31.4%; the belled ends of short belled piles bore the uplift loads at initial stages of being loaded, while the belled ends of long rock-socketed piles did not bear loads necessarily, so the belled ends for longer uplift piles were not necessary; when the strength of pile shafts was higher than that of rock around piles, the uplift bearing capacity of test piles was provided by the shear strength of rock around piles, and the ultimate side friction resistance could be equivalent to the shear strength of rock around piles.
- belled piles,
- load-bearing characteristics,
- field test,
- ultimate bearing capacity,
- sandstone strata

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References(24)

References

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