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Implementation method of three-dimensional monitoring network for foundation pit engineering based on distributed optical fiber sensors

A technology of distributed optical fiber and optical fiber sensor, which is applied in the field of foundation pit engineering monitoring and geotechnical engineering, and can solve the problems of many manual operations, large accidental errors, and single-point monitoring.

Active Publication Date: 2019-12-27
TONGJI UNIV
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  • Abstract
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Problems solved by technology

At present, the commonly used deformation monitoring methods include levels and inclinometers, etc., but due to the large accidental errors caused by human factors, scattered data points are difficult to truly reflect the overall deformation of the structure, which belongs to point monitoring. Most of the technology is limited to the monitoring of a single enclosure structure, with more manual operations, single-point monitoring, and no real-time monitoring and feedback system

Method used

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  • Implementation method of three-dimensional monitoring network for foundation pit engineering based on distributed optical fiber sensors
  • Implementation method of three-dimensional monitoring network for foundation pit engineering based on distributed optical fiber sensors
  • Implementation method of three-dimensional monitoring network for foundation pit engineering based on distributed optical fiber sensors

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Embodiment

[0069] The invention provides a method for realizing a three-dimensional monitoring network for foundation pit engineering based on distributed optical fiber sensors. (The steps to be implemented are as follows: figure 1 shown, in which the numerical labels are the sequence of steps)

[0070] (1) Before the reinforcement cage 1 of the underground diaphragm wall is lowered, the reinforcement shall be polished to remove the sharp parts on the surface to ensure that unnecessary damage to the optical fiber sheath is reduced.

[0071] (2). In the steel cage 1 of the underground diaphragm wall, the sensing fiber 4 for monitoring strain and the sensing fiber 5 for temperature compensation are arranged. The arrangement of the sensing fibers 4 and 5 adopts the internal implantation method, mainly for the steel cage. 1. Sensing fibers 4 and 5 are arranged on the two sides facing and facing away from the foundation pit area, and the sensing fibers 4 and 5 are laid in a mesh structure on...

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Abstract

The invention provides a foundation pit engineering three-dimensional monitoring network realization method based on distributed optical fiber sensors, which relates to a scheme of laying optical fiber sensors on an enclosure and support structure, overall deformation and force bearing analysis on the enclosure and support structure and generation of a strain distribution cloud map. Based on the characteristics that the frequency changes of back Brillouin scattering light formed by scattering of optical wave molecules of the optical fibers and incident light are sensitive to strain and temperature and BOTDA sensing advantages and benefiting from the accurate, stable and real-time monitoring advantages of the optical fiber sensors, the optical fibers on the components are arranged to a three-dimensional monitoring network, comprehensive and three-dimensional deformation and force bearing monitoring can be carried out on enclosure and support components and other components in the foundation pit project, real-time monitored data are guided to surfer to generate a structure strain distribution cloud map, and the method of the invention is a visualized and three-dimensional monitoringmeasurement and control method.

Description

technical field [0001] The invention belongs to the technical field of monitoring of geotechnical engineering and foundation pit engineering, in particular to a method for realizing a three-dimensional monitoring network of foundation pit engineering based on distributed optical fiber sensors. Background technique [0002] The stability of deep foundation pit itself and its influence on surrounding buildings during excavation and support are important issues in foundation pit engineering. The deformation monitoring of the foundation pit project runs through the stages before, during and after the project is implemented, and is a necessary work to evaluate the stability of the foundation pit and the degree of influence on the surrounding buildings. At present, the commonly used deformation monitoring methods include level gauges and inclinometers, etc. However, due to the large number of accidental errors caused by human factors, it is difficult for scattered data points to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 王建秀崔韬刘笑天赵宇徐娜邓沿生刘月圆
Owner TONGJI UNIV
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