土木工程与管理学报2025，Vol.42Issue(6)：99-104,6.DOI:10.13579/j.cnki.2095-0985.2025.20250250
大范围扰动深基坑双排桩变形全同弱光纤Bragg光栅检测技术
Detection Technology of Deformation of Double-row Piles in Large-scale Disturbance Deep Foundation Pit by Identical Weak Fiber Bragg Grating
魏巍 1张明晶 1李萌 1贾栋 1林志军1
作者信息
- 1. 山东省交通规划设计院集团有限公司,山东 济南 250014
- 折叠
摘要
Abstract
The geological conditions of deep foundation pits under large-scale disturbances are com-plex,and the deformation data of double-row piles have large errors,which affect the comparison ac-curacy between the deformation characteristics modal values and the warning threshold.In response to this,this paper proposes a weak fiber Bragg grating detection technology for the deformation of double-row piles in deep foundation pits under large-scale disturbances.Bragg grating sensors wrapped by metal sleeves are buried at the top,body,and bottom of double row-piles.The specific wavelength light reflected by the Bragg grating sensor is used to obtain pile information,and the spectrum is cor-rected by combining strain and temperature factors to obtain high-quality fiber Bragg grating spectra.By reusing the interference method to demodulate the spectral wavelength state,the reflected wave-length drift state is converted into phase data.The empirical mode decomposition is used to obtain the residual spectral wavelength components of the fault characteristics,and the deformation characteristic mode values are calculated and input into ABAQUS 2022 to obtain the horizontal displacement at the pile top,the bending moment distribution of the pile body,and the deflection value of the pile body.The deformation characteristic mode values are compared with the warning threshold to detect the de-formation of double-row piles in deep foundation pits.Experimental results show that the coincidence between the bending moment distribution curve of the pile detected by this technology and the actual situation is over 92％,and the error between the detection results of the horizontal displacement of the pile at different depths and the actual results is less than 1.5 mm.This technology has high detection accuracy and can effectively detect the deformation of double-row piles in deep foundation pits.关键词
大范围扰动/深基坑/双排桩变形/全同弱光纤/Bragg光栅Key words
large-scale disturbance/deep foundation pit/double-row piles deformation/identical weak optical fiber/Bragg grating分类
建筑与水利引用本文复制引用
魏巍,张明晶,李萌,贾栋,林志军..大范围扰动深基坑双排桩变形全同弱光纤Bragg光栅检测技术[J].土木工程与管理学报,2025,42(6):99-104,6.
