Method for measuring and calculating circumferential strain of rock sample by utilizing distributed-type optical fiber grating sensing network

A distributed optical fiber, hoop strain technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of large dispersion of results, large environmental impact, low measurement accuracy, etc., and achieve high test accuracy and data stability. Effect

Inactive Publication Date: 2015-07-01
HOHAI UNIV
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Problems solved by technology

At present, the method of obtaining the circumferential strain of rock samples mainly uses strain gauges, strain rings, strain gauges, etc., which cannot obtain the overall circumferen

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  • Method for measuring and calculating circumferential strain of rock sample by utilizing distributed-type optical fiber grating sensing network
  • Method for measuring and calculating circumferential strain of rock sample by utilizing distributed-type optical fiber grating sensing network
  • Method for measuring and calculating circumferential strain of rock sample by utilizing distributed-type optical fiber grating sensing network

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Embodiment

[0026] Embodiment: The method of the present invention for measuring and calculating the circumferential strain of a cylindrical rock sample is to use a distributed fiber grating sensor network evenly distributed on the rubber sleeve on the circumferential surface of the rock sample to measure. In the triaxial compression test, the coordinated micro-deformation of the rock sample on the rubber sleeve is measured, and the temperature compensation sensor is connected in series to eliminate the influence of temperature changes on the strain data, and the information is transmitted to the fiber grating solution through the distributed fiber grating sensor network. Adjust the instrument to convert the data of wavelength and strain, and then import the data into the computer for analysis and calculation, and finally obtain the accurate circumferential strain of the rock sample and the circumferential deformation diagram of the rock sample at each instant.

[0027] The specific implem...

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Abstract

The invention discloses a method for measuring and calculating circumferential strain of a rock sample by utilizing a distributed-type optical fiber grating sensing network. The method includes: arranging two sets of optical fiber grating sensors which are in series connection on a rubber sleeve coated on the outer surface of the rock sample at an interval along the peripheral direction and the axial direction of the rock sample in a staggered mesh form to form the optical fiber grating sensing network to measure and calculate local strain of each point in the circumferential direction of the rock sample; enabling each optical fiber grating sensor to be serially connected with one temperature compensation sensor to finally acquire circumferential strain of the rock sample and a circumferential deformation diagram of the rock sample at each transient time. Distributed mesh type sensor layout is utilized, so that accurate local strain monitoring of the circumferential surface of the rock sample can be realized while circumferential deformation diagram of the rock sample at a certain transient moment is acquired, knowing of deformation features of the rock sample at each stage of an experiment is facilitated, and circumferential strain features of the rock sample can be reflected more objectively.

Description

technical field [0001] The invention relates to the field of rock mechanics and engineering, in particular to a method for measuring and calculating the circumferential strain of a rock sample. Background technique [0002] At present, research in the field of rock mechanics and engineering mainly focuses on three aspects: basic theoretical research on rocks, rock test research, and numerical simulation calculations. Among them, rock test research is the basis for basic theoretical research and numerical simulation calculations. Rock test research is divided into indoor test and field test. Due to the limitation of engineering geological conditions, field test is difficult to test or the test results have large deviations in many cases, while indoor test is easier to implement, the result is more ideal, and can Many more mature soil mechanics theories are used for research, so the indoor test of rock is favored by researchers. [0003] The triaxial compression test of rock ...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 刘琳徐卫亚王环玲王伟王如宾石崇俞隽闫龙
Owner HOHAI UNIV
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