Coal mine working face detecting method with cutting vibration as seismic signal

Abstract

The invention relates to a coal mine working face detecting method with cutting vibration as a seismic signal. The coal mine working face detecting method with the cutting vibration as the seismic signal comprises the following steps: (1) data acquisition, (2) data processing, and (3) data interpretation: by directly using a transmission coefficient, large tectonic faults, such as wrong coal seam faults and collapse columns which can block trough wave transmission, can be judged; according to an CT (computed tomography) image, collapse columns, old kiln laneway and the like which cannot block a trough wave but can cause change of the wave speed can be confined; and a tectonic interpretation diagram of a working face can be comprehensively drawn. After adoption of the method, the coal mining operation is not disturbed; a detector is installed on the side wall of a laneway, without any influence on normal operation of a coal mine; during data acquisition, the coal mining operation is not required to be interrupted; a seismic source is high in energy and free of noise; when a coal mining machine cuts a coal seam, a strong seismic wave is emitted and can also be accumulated through superposition within a certain time period; the energy is high because a strong noise is converted into a strong signal; and an obtained single shot record is very clear, almost without any noise.

Description

technical field [0001] The invention belongs to the technical field of advanced exploration of underground working faces in coal mines, and relates to a method for detecting coal mine working faces using cutting vibrations as seismic signals. Background technique [0002] The real-time detection of small abnormal structures such as gobs, small faults, and collapse columns inside the coal mining face is very important for preventing disasters and accidents and setting up economical and reasonable coal mining schemes. The existence of small structures such as gobs and faults destroys the continuity of the coal seam, affects the stability of the surrounding rock of the shaft, and will form a good water-conducting channel (especially the collapse column) or a gas storage place, which becomes the roof and floor of the coal seam. Potential hazards of water and gas inrush. With the development of mechanized coal mining in mines, the obstruction of coal mining machinery by faults a...

AI Technical Summary

Problems solved by technology

However, the channel wave exploration method still has some limitations: the coal mining operation needs to be suspended during the detection; an artificial seismic source needs to be provided, and under the high safety requirements of coal mines, the use of explosives is not safe enough, and the use of hammering energy has limitations

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