Vibroseis and method for underground coal seam seismic CT detection based on spring-induced shock waves

Abstract

A vibrator and method for underground coal seam seismic CT detection based on spring-induced shock waves, characterized in that it includes a spring striking mechanism and a power mechanism, the spring striking mechanism is installed in a sleeve (11), and the sleeve (11 ) is fixedly installed in the hole drilled on the roadway wall through the fixing mechanism. The spring hitting mechanism includes a spring (12), a hammer head (15) and a backing plate (16). One end of the backing plate (16) is inserted into the sleeve (11), the other end is located outside the sleeve (11) and against the bottom of the drilled hole, the spring (12) drives the hammer head (15) to hit the backing plate (16), and the backing plate (16) is located outside the sleeve One end hits the bottom of the hole to generate controllable vibration waves in the coal seam. There is a guide groove on the hammer head (15), and the movement is guided by the guide pin (14) installed on the sleeve (11). The power mechanism is used to drive The tup (15) compresses the spring (12), so that the tup (15) is in an excited state. The invention has simple structure and is easy to realize.

Description

technical field [0001] The invention relates to a seismic CT detection technology, in particular to a vibroseis CT detection technology, in particular to a vibroseis and method for underground coal seam seismic CT detection based on spring-induced shock waves. Background technique [0002] At present, the frequency and intensity of rock burst in my country are increasing, which poses a major threat to the safe production of coal resources. The occurrence of rock burst is directly related to the high stress of coal and rock accumulation. The study of stress distribution in coal rock is the basis for analyzing and predicting the risk of rock burst and other dynamic phenomena. According to the good correspondence between wave velocity and stress, seismic CT detection technology can invert the stress distribution characteristics during the excavation of coal and rock mass, so as to predict the rock burst and other dangerous areas where dynamics appear in the next period. [000...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the existing underground seismic CT detection technology, the use of explosive seismic sources has many potential safety hazards, low efficiency, and large engineering volume, and it is difficult to meet the dynamic and timely prediction and forecast of impact mine pressure and other dynamic manifestations, and it is difficult to realize For the automation and normalization of dynamic disaster prediction and forecasting, it is difficult to effectively and timely test the effect of anti-scouring measures, etc., to provide a seismic source and method for exciting shock waves in boreholes for CT detection of underground coal seam earthquakes. The seismic source can be used in roadway construction. Excite shock waves in holes drilled at any angle, small size, safe and reliable, simple operation, high degree of automation, and can excite shock waves stably and controllably for a long time

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