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Distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof

A distributed optical fiber and surrounding rock deformation technology, which is applied in measurement devices, optical devices, instruments, etc., can solve the problems of tunnel surrounding rock advance deformation monitoring without a relatively complete monitoring system construction technology and monitoring methods, and achieve accurate reflection. Effect

Pending Publication Date: 2017-08-18
云南大永高速公路建设指挥部 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PPP-BOTDA distributed optical fiber is suitable for the detection and monitoring of the health status of large structures. At present, there is no relatively complete monitoring system and its construction technology and monitoring method in the monitoring of the advanced deformation of the surrounding rock of the tunnel.

Method used

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  • Distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof
  • Distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof
  • Distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] according to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 It can be seen that an advanced monitoring system for tunnel surrounding rock deformation based on PPP-BOTDA distributed optical fiber sensing consists of a first sensor 13 , a second sensor 14 and an information system 12 . The first sensor 13 and the second sensor 14 can be connected in series, and the first sensor 13 and the second sensor 14 are connected with the host computer interface of the information system 12 to form a closed loop. 1m×1m brick groove 3, inner connection pipe 4, right-angle elbow 5, first groove 6, second groove 7, third groove 8, fourth groove 9, heat shrinkable sleeve 10, vertical conduit 11 , the connection relationship is: the hollow tube 2 is connected to the inner tube, the hollow tube 2 is welded by the inner tube 4 to reach the expected length, and the optical fiber 1 is laid in the first groove 6 and the second groove 7 to for...

Embodiment 2

[0060] A construction method of a tunnel surrounding rock deformation advanced monitoring system (first sensor, second sensor) based on PPP-BOTDA distributed optical fiber sensing, the steps are:

[0061] A. Firstly, in the influence area of ​​the cross section between the underpass tunnel and the existing structures and buildings such as existing roads, tunnels, and office buildings, along the axial direction of the tunnel (the second sensor 14 is along the tunnel cross-section direction of the cross section) on the ground surface Excavation of trenches, the trench length ranges from 5 or 6 or 7 or 8 meters to 500 or 600 or 700 or 800 meters (the length of the trench in the cross-sectional direction is 3 or 4 or 5 times the tunnel diameter from the horizontal distance of the tunnel axis), the trench The width is 0.5 or 0.7 or 0.9 or 1m, the depth of the trench can be determined as 0.5 or 0.8 or 1.5 or 2 or 2.4 or 2.8 or 3m according to the construction site conditions, and the...

Embodiment 3

[0071] A method for monitoring tunnel surrounding rock deformation ahead of time based on PPP-BOTDA distributed optical fiber sensing, the steps of which are:

[0072] a. First conduct a preliminary test, connect the pump light interface of the information system host to the connector at one end of the first sensor 13, and connect the detection optical interface to the connector at the other end of the second sensor 14 to form a closed loop, and emit pump light and detection light signals respectively , and receive reflected light signals, and the host computer of the information system 12 processes these signals;

[0073] b. Next, locate the specific positions of the first sensor 13 and the second sensor 14, respectively cover the first sensor 13 and the second sensor 14 with hot towels (at a temperature of 60 degrees Celsius) to fix the position of the optical fiber 1 a little, so that the optical fiber at this position 1. The temperature (at 60 degrees Celsius) is obviously...

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Abstract

The invention discloses a distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof. The monitoring system is composed of a first sensor, a second sensor, and an information system. The first sensor and the second sensor can be connected in series and then connected with the host interface of the information system to form a closed loop. According to the construction method, sensing fibers are symmetrically arranged in four grooves in the outer wall of a hollow circular pipe to form vertical and horizontal sensing loops, and sensors are embedded into pre-excavated trenches in the surrounding rock of a tunnel. According to the monitoring method, the vertical displacement distribution of the sensors can be calculated by performing differential and integral operations on the strain of the two fibers in the symmetrical first and second grooves of the hollow circular pipe. Distributed monitoring and real-time and advance monitoring are adopted. The data is stable and reliable. The cost is low. The monitoring system is suitable for dynamic real-time monitoring of the vertical and horizontal deformation of the surrounding rocks of existing highways under tunnels, tunnels, office buildings and other structures, and in influence areas of buildings.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering monitoring, and more specifically relates to a tunnel surrounding rock deformation advanced monitoring system based on PPP-BOTDA distributed optical fiber sensing, and also relates to a tunnel surrounding rock based on PPP-BOTDA distributed optical fiber sensing The construction and monitoring method of the deformation advanced monitoring system is especially suitable for the monitoring of the longitudinal and horizontal deformation of the surrounding rock in the area affected by the new tunnel passing through existing structures such as existing roads, tunnels, and office buildings. Background technique [0002] Our country is in the period of large-scale infrastructure construction, and a large number of tunnel projects have appeared in various fields such as transportation, national defense, and water conservancy. With the continuous improvement of the national highway network ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 罗红星武松但路昭段文正汤华钟明文徐伟然李睿
Owner 云南大永高速公路建设指挥部
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