Bearing characteristics of ultra-long piles based on distributed fiber optic sensing technology

FU Zhangxin; CAO Wenzhao; WU Xujun; ZHANG Xingjie; LUO Muchi

doi:10.11779/CJGE2024S20010

Volume 46 Issue S2

Turn off MathJax

Article Contents

Abstract

References

Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 140-144. > DOI: 10.11779/CJGE2024S20010

FU Zhangxin, CAO Wenzhao, WU Xujun, ZHANG Xingjie, LUO Muchi. Bearing characteristics of ultra-long piles based on distributed fiber optic sensing technology[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 140-144. DOI: 10.11779/CJGE2024S20010

Citation:

PDF (1368 KB)

Bearing characteristics of ultra-long piles based on distributed fiber optic sensing technology

FU Zhangxin^1,,
CAO Wenzhao^{1, 2, ,},
WU Xujun^{1, 2},
ZHANG Xingjie²,
LUO Muchi¹

1.
Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100082, China
2.
China Jingye Engineering Co., Ltd., Beijing 100082, China

More Information

Received Date: June 20, 2024

Graphical Abstract

Abstract

Abstract

Based on a series of pile foundation tests from a project in the Super Headquarters Base in Shenzhen Bay, the load deformation characteristics of super-long piles under different geological conditions and the impact of friction coefficient on pile-soil interaction in numerical simulations are investigated. The FBG (fiber bragg grating) densely distributed fiber optic sensing technology is employed for internal force tests of the piles and the ABAQUS for numerical simulations. The results of the simulated average lateral resistance of the soil layers are compared and analyzed with different friction coefficient values applied to the pile-soil interface. The results indicate that: (1) The load deformation characteristics of bored piles are closely related to the pile length and the properties of the bearing stratum. The axial force of super-long piles decreases linearly with depth, and the end resistance ratio significantly reduces. In cases where the bearing layer consists of moderately weathered granite, the axial force of the test pile decreases in a "bulging" shape along the depth direction, with the end resistance ratio lower than 17.1%. (2) The method for determining the friction coefficient in numerical simulations significantly impacts the simulated lateral resistance of the soil. Multiple friction coefficients at the pile-soil interface can improve the accuracy of the simulated results, depending on the nature of the soil layer.

FullText(HTML)

References (9)

References

[1]	朴春德, 施斌, 魏广庆, 等. 分布式光纤传感技术在钻孔灌注桩检测中的应用[J]. 岩土工程学报, 2008, 30(7): 976-981. doi: 10.3321/j.issn:1000-4548.2008.07.005 PIAO Chunde, SHI Bin, WEI Guangqing, et al. Application of distributed fiber optic sensing techniques in bored pile detection[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(7): 976-981. (in Chinese) doi: 10.3321/j.issn:1000-4548.2008.07.005
[2]	杨建平, 朴春德, 常鸿飞, 等. 水平荷载下灌注桩变形分布式检测及承载机制研究[J]. 岩石力学与工程学报, 2014, 33(增刊1): 2983-2988. YANG Jianping, PIAO Chunde, CHANG Hongfei, et al. Distributed detection of deformation and bearing mechanism on bored pile under horizontal load[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S1): 2983-2988. (in Chinese)
[3]	贺嘉, 陈国兴. 基于ABAQUS软件的大直径桩承载力-变形分析[J]. 地下空间与工程学报, 2007, 3(2): 306-310. doi: 10.3969/j.issn.1673-0836.2007.02.025 HE Jia, CHEN Guoxing, Analysis of bearing capacity- deformation of the large diameter pile by the ABAQUS software[J]. Chinese Journal of Underground Space and Engineering, 2007, 3(2): 306-310. (in Chinese) doi: 10.3969/j.issn.1673-0836.2007.02.025
[4]	高鲁超, 叶生洋. 基于ABAQUS软件的单桩静载试验数值模拟[J]. 河北工程大学学报(自然科学版), 2015, 32(3): 51-54. GAO Luchao, YE Shengyang. Numerical simulation of the single pile static load test based on ABAQUS software[J]. Journal of Hebei University of Engineering (Natural Science Edition), 2015, 32(3): 51-54. (in Chinese)
[5]	秦仕伟, 高磊, 韦兵兵, 等. 基于光纤技术和有限元计算的灌注桩承载特性[J]. 科学技术与工程, 2023, 23(13): 5685-5692. QIN Shiwei, GAO Lei, WEI Bingbing, et al. Bearing characteristics of cast-in-place piles based on optical fiber technology and finite element calculation[J]. Science Technology and Engineering, 2023, 23(13): 5685-5692. (in Chinese)
[6]	HUANG X D, WANG Y, SUN Y Y, et al. Research on horizontal displacement monitoring of deep soil based on a distributed optical fibre sensor[J]. Journal of Modern Optics, 2018, 65(2): 158-165. doi: 10.1080/09500340.2017.1382594
[7]	深圳市建筑基桩检测规程: SJG 09—2020[S]. 2020. Testing Specification of Building Foundation Piles in Shenzhen City: SJG 09—2020[S]. 2020. (in Chinese)
[8]	建筑基桩检测技术规范: JGJ 106—2014[S]. 2014. Technical Code for Testing of Building Foundation Piles: JGJ 106—2014[S]. 2014. (in Chinese)
[9]	曹文昭, 杨志银, 王雪阳. 大直径超长桩静载试验中试桩-锚桩相互影响分析[J]. 工业建筑, 2022, 52(9): 206-213. CAO Wenzhao, YANG Zhiyin, WANG Xueyang. Analysis of interaction between test piles and reaction piles of super-long large diameter piles in static loading tests[J]. Industrial Construction, 2022, 52(9): 206-213. (in Chinese)