Optical fiber sensor system for monitoring well wall and deformation early warning method

Abstract

The invention provides an optical fiber sensor system for monitoring a well wall and a deformation early warning method. The optical fiber sensor system comprises distributed optical fiber sensors, fiber bragg grating strain sensors, external fiber bragg grating temperature sensors, an optical cable, a distributed optical fiber demodulation instrument, a fiber bragg grating demodulation instrumentand a computer. The several distributed optical fiber sensors, the several fiber bragg grating strain sensors and the several external fiber bragg grating temperature sensors are arranged on the internal surface of the well wall. The several distributed optical fiber sensors are connected to the distributed optical fiber demodulation instrument through the optical cable. The distributed optical fiber demodulation instrument is connected to the computer. The fiber bragg grating strain sensors and the external fiber bragg grating temperature sensors are connected to the fiber bragg grating demodulation instrument through the optical cable. In the invention, grouting pressure on the inner layer of the well wall , the deformation of the inner layer of the well wall and a well wall temperaturecan be monitored.

Description

technical field [0001] The invention relates to the field of mine construction, in particular to an optical fiber sensor system for monitoring shaft walls and a deformation early warning method. Background technique [0002] Since the 1980s, a large number of mines in Datun, Xuzhou, Huaibei, Yanzhou, Yongxia and other mining areas have experienced shaft wall rupture disasters in thick topsoil layers. Some of them occurred during shaft construction, and some occurred after the mine was put into production. , the lighter ones stop work and stop production, and the more serious ones are permeable and flooded wells, which seriously restrict the further development of deep shaft construction in my country. The research on the mechanism of borehole wall fracture has formed the hypothesis of vertical additional force, the hypothesis of mining influence, and the hypothesis of neotectonic movement. The results of a large number of theoretical analysis, numerical simulation and field ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an optical fiber sensor system for monitoring the borehole wall and a method for early warning of deformation. The technical solution of the present invention solves the monitoring problem of the borehole wall during the reinforcement and grouting process of deep shaft formations under existing wellbore conditions, and provides A method for determining the early warning value of wellbore deformation based on the current stress condition of the wellbore is proposed, whic

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