摘要
光纤传感技术作为一种分布式感知手段已成功应用于地质与岩土工程领域,实际工程中由于传感光纤与待测岩土体之间模量差异,造成二者变形协调的差异,进而影响了监测的可靠性。采用室内模型试验,通过逐级加载,分别建立光纤和土体变形与荷载之间的相互关系;并研究了光纤封装方式、约束条件、光纤埋深等因素对变形协调的影响,揭示了光纤-土体协调变形演化规律。试验结果表明:随着光纤与土体模量差异的增大,光纤与土体协调变形效果逐渐减弱;有约束条件下,光纤与土体协调性与所受荷载有关;相同荷载下,埋设较浅处光纤变形较深处大;随着埋深的增大,土体变形逐渐衰减,二者的协调性受土体自身变形的影响。
As a type of distributed sensing means,optical fiber sensing technology has been successfully applied in geology and geotechnical engineering.In practical engineering,the difference in modulus between the sensing fiber and rock-soil body to be tested would cause a difference in the deformation coordination,further affecting the monitoring reliability.This paper used indoor model tests to establish the load-deformation correlation of optical fibers and soil by step loading,respectively.The effects of the packaging type of the optical fiber,constraints,fiber buried depth,and other factors on the deformation coordination were investigated,and the evolution law of the fiber-soil coordinated deformation was revealed.The test results showed that with the increase of the modulus difference between the fiber and soil,the coordinated deformation gradually reduced.Under the constraints,the fiber-soil coordination was related to the load.Under the same load,the deformation of the optical fiber buried at the shallower depth was larger than that at the deeper depth.As the optical fiber was buried deeper,the soil deformation was gradually reduced,and the coordination was affected by the soil itself.
作者
薛新亮
XUE Xinliang(Linfen South Branch of Shanxi Transportation Holdings Group Co.,Ltd.,,Linfen,Shanxi 042100,China)
出处
《山西交通科技》
2024年第3期30-34,共5页
Shanxi Science & Technology of Transportation
基金
山西交控科技项目(2022-JKKJ-1,2022-JKKJ-7)。
关键词
传感光纤
协调变形
荷载试验
监测
sensing fiber
coordinated deformation
loading test
monitoring
