摘要
Abstract
To study the temperature rise law of optical fibers in defect grouting pile foundations based on distributed optical fiber temperature measurement technology,through conducting broken pile model tests,the regularity of temperature changes of optical fiber sensing elements in broken piles and the correlation between heating power and temperature changes of optical fiber sensing elements were systematically analyzed.Studies show that based on model tests,distributed optical fiber temperature measurement technology(DOFS)has significant practical potential in the identification of pile breakage defects in foundation piles,and its verification results provide an innovative technical approach for the evaluation system of pile integrity.The stable temperature rise of the section with mud inclusion defects is significantly higher than that of the intact concrete section.The location of the pile body defects can be accurately determined through the local abnormal increase in temperature rise during the heating process of optical fibers.There is a highly linear correlation between the stable temperature rise of the optical fiber and the heating power.The correlation coefficients are all greater than 0.996 4,indicating that the temperature rise increases linearly with the increase of the heating power.关键词
分布式光纤测温技术/缺陷灌注桩/断桩模型试验Key words
Distributed optical fiber temperature measurement technology/Defective cast-in-place piles/Pile breaking model test分类
建筑与水利
