Road stress and strain comprehensive monitoring method based on FBG sensing technology

A fiber grating and highway technology, which is applied in the measurement, measurement force, and measurement device of the change force of the optical properties of the material when it is stressed, can solve the problem of comprehensive monitoring of stress and strain on the roadbed and road surface, and affect the normal operation of the road , unable to achieve full-section or three-dimensional real-time continuous monitoring and other problems

Active Publication Date: 2021-09-21
LANZHOU UNIVERSITY
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  • Application Information

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Problems solved by technology

Conventional monitoring methods are mature in technology and widely used, but most of them use point monitoring and data acquisition, which cannot realize full-section or three-dimensional real-time continuous monitoring. Real-time, continuous and accurate comprehensive monitoring of stress and strain of highway subgrade and pavement under the action of vehicle dynamic load

Method used

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  • Road stress and strain comprehensive monitoring method based on FBG sensing technology
  • Road stress and strain comprehensive monitoring method based on FBG sensing technology
  • Road stress and strain comprehensive monitoring method based on FBG sensing technology

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific embodiment: (embodiment description is correct)

[0037] This embodiment is illustrated by taking a two-way 6-lane expressway with 3 lanes on one side as an example. The expressway structure includes a subgrade, a base (subgrade water stability layer), and a surface course. The top layer is the surface layer, the thickness of which is generally 15cm; below the surface layer is the road base layer, which is the main load-bearing layer, and the total thickness is generally 30-40cm. This design takes 35cm as an example; the bottom layer is the road subgrade. In the same section perpendicular to the direction of the road, the fiber optics are laid out at different horizontal levels as follows: 3 layers for the surface layer, 7 layers for the base layer, and 2 layers for the roadbed. The distance between each layer of optical fiber is 5cm. Three kinds of sensors are arranged in the same positi...

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Abstract

The invention discloses a road stress and strain comprehensive monitoring method based on an FBG sensing technology. The method comprises the steps of 1) conducting point location arrangement; 2) packaging a stress sensor; 3) packaging a strain sensor; 4) packaging a temperature compensation sensor; 5) conducting sensor laying; 6) carrying out data acquisition. The stress sensor, the strain sensor and the temperature compensation sensor are laid in a roadbed layer, a base layer and a surface layer of a road, and stress and strain data at different depths of different structural layers of the road can be continuously and accurately measured. Real-time, continuous, accurate and three-dimensional measurement of stress and strain information of an experimental road section is realized.

Description

technical field [0001] The invention belongs to the technical field of road monitoring and optical fiber application, and in particular relates to a road stress and strain comprehensive monitoring method based on FBG fiber grating sensing technology. Background technique [0002] The long-term repeated action of vehicle dynamic load will cause different degrees of strength fatigue and deformation damage to the roadbed and pavement. In order to optimize the design of highway structures, explore the coupling relationship between stress and strain at different depths of the highway under the action of dynamic loads, reveal the law of highway deformation and failure, and conduct real-time and long-term health monitoring of highways during the operation period, it is necessary to comprehensively analyze the stress and strain of the roadbed and pavement. monitor. [0003] Traditional subgrade monitoring methods are divided into surface monitoring and internal monitoring. Surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24G01B11/16
CPCG01L1/246G01B11/16
Inventor 刘小伟吕擎峰伏晓刚张旭栋杨天祥苏子淞刘备郭连星
Owner LANZHOU UNIVERSITY
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