Abandoned mine space detection method based on multi-frequency roadway reflection radio waves

Abstract

The invention relates to an abandoned mine space detection method based on multi-frequency roadway reflection radio waves, and the method comprises the steps: (1), arranging a plurality of equidistant detection receiving points in a rock roadway along the direction of the roadway, and designing and arranging a plurality of radio wave transmitting points and response receiving sections; step (2), placing a radio wave transmitter at the transmitting point, selecting one or two radio wave receivers for receiving radio wave signals, and starting detection work by adopting a plurality of frequencies; and (3) analyzing the field intensity data of the receiving point corresponding to each transmitting point acquired on site to obtain the geological abnormal area of the abandoned mine goaf and the depth of the geological abnormal area. The method can be used for conducting radio wave reflection exploration on the same raw coal layer working face, the purpose of exploring the abnormal body in the abandoned mine goaf is achieved, and the underground space range and the surrounding rock development condition are determined.

Description

technical field [0001] The invention belongs to the mine electromagnetic exploration technology, and mainly relates to a space detection method for abandoned mines based on the reflection of radio waves from multi-frequency roadways. Carry out the exploration of the remaining space in the working face of the abandoned coal seam. Background technique [0002] With the mining of coal resources, a large number of mines are facing the status quo of abandonment due to their life cycle, or because of production safety requirements and profit losses. Direct disposal will not only lead to the waste of a large number of potential resources, but also leave certain safety and environmental hazards. Abandoned mines have "treasures to be found", and goafs may leave a large amount of coalbed methane, groundwater or huge storage space. Therefore, it is of great significance to develop and utilize abandoned mines. [0003] At present, radio wave perspective technology has been widely used...

AI Technical Summary

Problems solved by technology

But in the working face of the abandoned mine, such as figure 1 , due to the continuous expansion of the underground space caused by the mining subsidence, the two roadway observation conditions necessary for the conventional mine radio wave perspective method cannot be realized; and the radio wave exploration method is used in the transportation roadway or the mining area transportation roadway, and there is a detection distance not enough problem

The roadway in the goaf area is easily affected by mining, resulting in deformation, damage and collapse of the surrounding rock; at the same time, the mine has been closed or abandoned for many years, and the geological conditions of the abandoned roadway have not been verified and entered rashly, which may easily lead to safety accidents; Excavating new roadways near empty areas has no economic value and may easily lead to safety hazards such as water inrush or gas leakage

[0004] At present, there is a lack of reasonable and effective detection methods for the underground space development and liquid-gas legacy in the goaf of abandoned mines, which seriously limits the utilization and development of abandoned mine space and resources.

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