CAJ | 학술논문

近年来分布式光纤感测技术在岩土与地质工程领域的应用研究已成为一个研究热点，但工程实践表明，埋入式传感光纤与被测岩土体之间的变形协调性会对监测结果产生显著的影响，该问题一直制约着光纤感测技术在工程监测中的推广。本文通过一系列室内拉拔试验，对比了3种预埋于砂土中的单模光纤在不同上覆压力的作用下的拉拔力-拉拔位移曲线，并建立了一个用于描述光纤-砂土界面力学性质的三段式的拉拔模型，分析峰值拉拔力、残余拉拔力、有效拉拔位移和残余拉拔位移4个参数在不同上覆压力作用下的变化情况。分析结果揭示传感光纤-砂土界面的力学特性和应力传递规律，为分布式光纤传感技术在岩土体变形监测中的应用，尤其在变形监测光纤的选用标准方面，提供了参考依据。
근년래분포식광섬감측기술재암토여지질공정영역적응용연구이성위일개연구열점，단공정실천표명，매입식전감광섬여피측암토체지간적변형협조성회대감측결과산생현저적영향，해문제일직제약착광섬감측기술재공정감측중적추엄。본문통과일계렬실내랍발시험，대비료3충예매우사토중적단모광섬재불동상복압력적작용하적랍발력-랍발위이곡선，병건립료일개용우묘술광섬-사토계면역학성질적삼단식적랍발모형，분석봉치랍발력、잔여랍발력、유효랍발위이화잔여랍발위이4개삼수재불동상복압력작용하적변화정황。분석결과게시전감광섬-사토계면적역학특성화응력전체규률，위분포식광섬전감기술재암토체변형감측중적응용，우기재변형감측광섬적선용표준방면，제공료삼고의거。
In recent years,the application of distributed optical fiber sensing (DOFS )technologies to geo-engineering monitoring has been a research focus.But in engineering practices,the deformation compatibility between the embedded sensing optical fibers and the soil and rock masses can significantly affect the monitoring results,which is the main barrier for the DFOS based engineering monitoring.This paper is based on a series of laboratory pullout tests on the three types of the single-mode optical fibers embedded in sand.The comparisons between the pullout force-pullout displacement curves of these fibers under different overburden pressures are conducted.A tri-linear pullout model is established to describe the fiber-sand interfacial mechanical characteristics. Using this model,the variations of the four model parameters,i.e.peak pullout force,residual pullout force, effective pullout displacement and residual pullout displacement, are analyzed considering the influence of overburden pressure.The analysis results indicate the mechanical properties of fiber-sand interface and stress-transfer mechanism,which provides valuable references for the application of the distributed optical fiber optic sensing to soil deformation monitoring,especially in terms of selection criterion of the deformation sensing fiber.