Down-hole coal seam earthquake CT detection vibroseis and method based on seismal waves excited by spring

Abstract

The invention discloses a down-hole coal seam earthquake CT detection vibroseis and method based on seismal waves excited by a spring. The down-hole coal seam earthquake CT detection vibroseis is characterized by comprising a spring striking mechanism and a power mechanism, wherein the spring striking mechanism is installed inside a sleeve (11), the sleeve (11) is fixedly installed in a hole drilled in a roadway wall through a fixing mechanism, the spring striking mechanism comprises the spring (12), a hammerhead (15) and a base plate (16), one end of the base plate (16) is inserted into the sleeve (11), the other end of the base plate (16) is located outside the sleeve (11) and abuts against the bottom of the drilled hole, the spring (12) drives the hammerhead (15) to strike the base plate (16), and the end, outside the sleeve, of the base plate (16) strikes the bottom of the hole, so that the controllable seismal waves are generated in a coal seam; a guide groove is formed in the hammerhead (15), movement guiding is achieved through a guiding pin (14) installed on the sleeve (11), and the power mechanism is used for driving the hammerhead (15) to compress the spring (12), so that the hammerhead (15) is in the excited state. The down-hole coal seam earthquake CT detection vibroseis is simple in structure and easy to obtain.

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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