Semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device and method

A fiber grating and measuring device technology, which is applied in the direction of measuring device, measuring force, and measurement of the change force of the optical properties of the material when it is stressed, to achieve high measurement accuracy, long service life, and small size.

Active Publication Date: 2017-07-04
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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Problems solved by technology

[0007] The present invention aims at the above-mentioned deficiencies existing in the existing in-situ stress testing technology under complex geological conditions, and proposes to use fiber

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  • Semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device and method
  • Semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device and method
  • Semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device and method

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Embodiment Construction

[0033] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0034] see Figure 6 , the present invention provides a semi-implantable hole bottom fiber grating strain gauge ground stress measurement device, which is based on fiber grating sensing and is suitable for ground stress measurement of broken surrounding rock. The device includes a fiber grating strain gauge probe 13, an optical fiber cable 7 at the injection end, an optical cable 8 at the transmission end, an optical fiber grating adjustment analyzer 14, a signal line 15, a data acquisition host 16, and a mounting rod 17 with an installer.

[0035] see Figure 1-5, the fiber grating strain gauge probe 13 includes a base 10, a semi-implanted epoxy resin substrate 9 mounted on the base 10, six fiber grating strain gauges arranged on the semi-implanted epoxy resin substrate 9 Gauge (i.e. the first FBG st...

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Abstract

The invention provides a semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device and method. The device includes a fiber bragg grating strainmeter probe, an injection end optical cable, a transmission end optical cable, a fiber bragg grating adjustment analyzer, a signal line, a data acquisition host and an installing rod with an installer. The fiber bragg grating strainmeter probe includes a pedestal and a semi-implantable epoxy resin substrate installed in the pedestal, six fiber bragg grating strainmeters are fixed on the epoxy resin substrate around the circumference at an interval of 60 degrees, after the six fiber bragg grating strainmeters are connected in series, two ends are connected with the injection end optical cable and the transmission end optical cable, the injection end optical cable and the transmission end optical cable are connected with the fiber bragg grating adjustment analyzer, and the fiber bragg grating adjustment analyzer is connected with the data acquisition host through the signal line. The semi-implanted hole bottom fiber bragg grating strainmeter geostress measuring device couples a fiber bragg grating sensor and a hole bottom strain technology, has the advantages of small size, wide measuring range, easy installation, high measuring accuracy, long serving time and the like, and provides a new approach with relatively high precision to complicated rock mass geostress measurement.

Description

technical field [0001] The invention relates to the field of ground stress measurement of complex rock mass drilling, in particular to a semi-implanted hole bottom fiber grating strain gauge ground stress measurement device and method. Background technique [0002] The existence of the initial stress of rock mass and its significant impact on rock mass engineering make it an important research content of engineering rock mass mechanics. Whether the characteristics of the initial in-situ stress field used in the project are reasonable or not will directly affect the reliability of the project design and the safety of the project operation. Therefore, more and more large-scale mining projects and water conservancy and hydropower projects have carried out very detailed work of joint testing and analysis of multiple in-situ stress measurement methods. [0003] Since the Swiss scholar Heim proposed the concept of in-situ stress stored in rock mass at the beginning of the 20th ce...

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Application Information

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IPC IPC(8): G01L1/24
CPCG01L1/246G01L1/247
Inventor 李永松尹健民刘元坤达桑高延鸿艾凯韩晓玉许静张新辉汪洋周春华旺杰付煜王亚军剑奎罗淑慧周焱斌
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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