Fiber grating multi-point sensing device for unconsolidated strata as well as monitoring system and method

A fiber grating and sensing device technology, applied in the direction of transmission monitoring/testing/fault measurement system, optical fiber transmission, transmission system, etc., to achieve the effect of convenient use and simple structure

Inactive Publication Date: 2011-10-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under such complex geological conditions, there is still no set of theories that can accurately calculate the stress on the borehole wall and the expected failure time

Method used

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  • Fiber grating multi-point sensing device for unconsolidated strata as well as monitoring system and method
  • Fiber grating multi-point sensing device for unconsolidated strata as well as monitoring system and method
  • Fiber grating multi-point sensing device for unconsolidated strata as well as monitoring system and method

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Embodiment 1

[0146] This technology was tested in a coal mine. The fiber grating sensor was buried in the loose layer of 110-170m through drilling, and the deformation process of the loose layer was tested with high precision. Engineering practice shows that fiber gratings are safe and reliable to use as strain detection, and preliminary results have been achieved.

[0147] (1) Design of drilling technical parameters

[0148] Between the main shaft and the air shaft in the industrial square, the loose layer settlement deformation observation boreholes are set at a horizontal distance of 129.1m from the main shaft and a horizontal distance of 88.2m from the air shaft, so that one borehole can monitor two wellbores. The distance between the bottom fiber grating sensor (38th floor) and the ground is 176.1m. Considering that a part of the drill cuttings will fall to the bottom of the borehole and affect the lowering of the fiber grating to a predetermined position, and there is enough space for the...

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Abstract

The invention discloses a fiber grating sensing layer-divided sinking apparatus for observing unconsolidated strata sedimentation, a data monitoring processing system, a grating sensor and an implantation method. The fiber grating sensing layer-divided sinking apparatus comprises a grating sensor and a grating sensor array, wherein the grating sensor array is used for applying a light source to the grating sensor through a broadband light source of a fiber grating demodulator and a coupler; a light signal returned by the grating sensor is input to the fiber grating demodulator through the coupler; the fiber grating demodulator is used for converting the light signal into an electric signal and calculating a center wavelength value of each grating sensor; the monitoring processing system is connected with a wavelength data acquiring module, a data analysis module, a time display wavelength module, a real-time monitoring curve module, an information prompt module, a forecasting alarm system module and the like respectively; and another path of data analysis is connected with a memory and a data processing module respectively. The device is simple in structure, not influenced by a severe environment, resistant to corrosion and electromagnetic interference, safe and reliable, convenient to use and widely applied to strata sedimentation; and sensing and transmission are integrated.

Description

Technical field [0001] The invention relates to a device and method for observing subsidence of geological strata, in particular to a fiber grating multi-point sensing device, a monitoring system and a monitoring method for long-term observation of loose stratum. Background technique [0002] Stratum subsidence is a common geological phenomenon. The subsidence of the stratum is a slow and long-term evolution and development process. In severe cases, it becomes a geological disaster, threatening the safety of people's lives and property, the use of structures, and causing social harm. Stratum subsidence refers to the geological phenomenon that the water level drops within a certain surface area. It mainly occurs in densely populated and economically developed cities in high-density residential areas. The excessive extraction of groundwater and the construction of large-scale underground projects are becoming more frequent. Human activities have made urban surface subsidence gradu...

Claims

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Application Information

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IPC IPC(8): G01B11/02H04L29/08H04B10/12H04B10/07H04B10/25
Inventor 柴敬李毅刘金瑄张广文杨建华王振平
Owner XIAN UNIV OF SCI & TECH
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