Mine well wall fracture monitoring and early warning system and method

Abstract

The invention relates to a mine well wall fracture monitoring and early warning system and method, and the method comprises the following steps: firstly, analyzing the position where a well wall is liable to be damaged according to the surrounding environment and geological conditions of a built well wall, and determining a monitoring region; a plurality of layers of microseismic sensors are installed on the inner side of the well wall of a monitoring area and connected with a ground acquisition instrument through a communication cable, and a seismic source signal is obtained in real time; the collected signal waveform is analyzed, a micro-seismic event reflecting well wall fracture is screened out, and the corresponding seismic source position, time, energy and fracture mechanism are determined through a related algorithm; the dynamic damage process of the well wall is described in real time according to the fracture source information, and early warning of well wall damage and instability disasters is finally achieved; according to the technical scheme, the method is different from a traditional displacement type monitoring method, and real-time dynamic monitoring and analysis of well wall micro-fracture in the whole space range can be achieved.

Description

technical field [0001] The invention relates to the field of mine shaft safety monitoring, in particular to a mine shaft wall rupture monitoring and early warning system and method. Background technique [0002] The shaft of the shaft is the throat of the mine, which bears the heavy responsibility of connecting the underground mineral resources with the surface production system. Due to the different stress conditions of the shaft wall, the variety of geological layers, and the large difference in the natural environment, it is easy to appear during the construction and use of the shaft. Deformation, damage and other phenomena have brought serious safety problems and property losses to the production and operation of coal mines. [0003] There are many factors for wellbore fracture, and it is difficult to accurately determine the time and area of ​​wellbore fracture through theoretical analysis. Therefore, it is particularly important to take effective monitoring methods to ...

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Problems solved by technology

[0008] The above monitoring methods all judge the change trend of the characteristic curve by the deformation amount or pressure value of the measuring point (line) and other indicators, so as to carry out the wellbore deformation and failure prediction research in the concept of time. Such methods cannot analyze the macroscopic instability of the wellbore It is difficult to reveal the essential law of macro-failure and instability induced by progressive micro-fractures on the borehole wall

[0009] In addition, most of these monitoring methods focus on the apparent information of borehole wall deformation as the monitoring object, which can better monitor the displacement and pressure of the inner surface of the borehole wall, but are often helpless for the micro-fractures that may exist inside the borehole wall

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