FBG packaging structure capable of monitoring soil-body small deformation and packaging method

Abstract

The invention provides an FBG packaging structure capable of monitoring soil-body small deformation and a packaging method. The method is characterized by using a thermoplastic tube and a quartz tubecapable of increasing a surface friction coefficient to carry out packaging protection on an FBG, and according to an actual monitoring demand, selecting the thermoplastic tube and the quartz tube with appropriate sizes; using abrasive paper to polish a thermoplastic tube surface and then installing and fixing to one side of an FBG raster; installing a quartz casing pipe in a grid area so as to protect the grid area and preventing a shear strain from damaging the grid area; and installing the thermoplastic tube after same processing on the other side of an FBG grid area, which is a soil-body small deformation FBG sensor. In the invention, a friction effect between the FBG sensor and a soil body is increased, coordination deformation between the FBG sensor and the soil body is improved, andthe small deformation of the soil body can be sensed; and shearing effect generated by the direct extrusion of the soil body is effectively avoided, the survival rate of the FBG buried in the soil body and the service life in the soil body are increased and prolonged, and soil body changes can be reliably and durably monitored.

Description

technical field [0001] The invention belongs to the field of rock and soil disaster prevention and monitoring, and relates to an FBG packaging structure and a packaging method, in particular to an FBG packaging structure and a packaging method capable of monitoring micro-deformation of soil. Background technique [0002] The field of rock and soil disaster prevention and monitoring is an observation discipline, and only through different observations and summaries in scientific research can disaster management and prevention be achieved. In the field of rock and soil disaster prevention and control, the occurrence of every rock and soil disaster is inseparable from the deformation of the soil, and the macroscopic rock and soil deformation is usually composed of several local micro deformations of the soil. Therefore, the observation of micro-deformation of soil is an important indicator for studying the macroscopic mechanical properties of rock and soil, such as the observat...

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Problems solved by technology

However, the experimental results show that although the problem of shedding and bending of the protective tube in the grid area has been solved, and the coordinated deformation between the optical fiber and the soil has also been improved, the soil and the optical fiber are still prone to slipping after encountering water, which is not good. Coordinated deformation of

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