Test Study of Sensing Fiber-Soil Coordinated Deformation
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.
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