Method for monitoring activity state of underground fault

Abstract

The invention relates to a method for monitoring the activity state of an underground fault, and belongs to the technical field of mining disaster monitoring. The method comprises the steps that an observation chamber is dug in a forward fault footwall or a reverse fault upper wall at first; horizontal medium-length holes are distributed in the observation chamber, the medium-length holes penetrate through the fault surface by a certain distance, and multipoint extensometers are mounted in the medium-length holes; an anchor rod multipoint stress detector, a drilled hole multipoint stress detector and a micro-seismic monitoring system are mounted on the position perpendicular to the fault surface; the displacement changes of the upper wall and the footwall of the fault, the additional tensile stress states of different positions away from the fault surface, additional shear stress states of different positions away from the fault surface, broken positions in the mining activity process and area data information of the fault can be monitored by collecting and processing the data in real time, and then the data are directly transmitted to a ground surface monitoring center. The method can monitor the displacement changes of the upper wall and the footwall of the fault, the states of additional tensile stress of the different positions away from the fault and perpendicular to the fault surface, the states of additional shear stress parallel to the fault surface, and the like in real time.

Description

technical field [0001] The invention relates to a method for monitoring the active state of an underground fault, and belongs to the technical field of mining disaster monitoring. Background technique [0002] Faults, as low-strength zones in rock bodies, are often activated by mining. The activation of faults will cause relatively strong deformation and damage to the surrounding rock of the shaft, and the sudden relative displacement of the two plates of the fault and the sudden release of elastic strain energy due to mining activities often cause mining dynamic disasters such as mine earthquakes, which bring serious damage to the mine. Therefore, it is necessary to find a monitoring method of fault activity status, make a correct prediction of the fault activity status, and make a timely prediction of the sliding instability of surrounding rock induced by fault activation under the influence of mining. Contents of the invention [0003] The invention provides a method f...

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Problems solved by technology

[0003] The invention provides a method for monitoring the active state of an underground fault, which is used to solve the problem of correctly and timely predicting the displacement, stress, and the location and area of ​​the active state of the fault under the influence of mining.

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