Device and method for measuring influence range of coal seam blasting through trace gas

Abstract

The invention relates to a device and method for measuring the influence range of coal seam blasting through trace gas. The device mainly comprises a gas-injection device and a trace gas storage and collection device. The device is characterized in that the gas-injection device is constituted through the step that after being connected with a gas bottle gas-injection connecting head, a gas pipe ofa trace gas bottle is connected with an injected gas pressure adjusting valve, a pressure gauge with a pressed adjusting valve and a gas-injection pipe with a gas pressure measuring adjusting valve through a three-way pipe; and the trace gas storage and collection device is constituted through the step that a gas extraction pipe is connected with a gas storage and collection box through a connecting head pipe with a valve. According to the method for measuring the influence range of coal seam blasting through the trace gas, the blank of actual measuring of the influence radius of coal seam blasting of a mine is made up; by utilizing the characteristics of stable diffusion and easy capturing of the trace gas SF6 and under the condition that it can be ensured that normal production of the mine is not influenced, the influence range of coal seam blasting is accurately measured; and the method is easy to operate and low in cost and has great economical and popularization properties.

Description

technical field [0001] The invention relates to the technical field of blasting effect investigation in coal mines, in particular to a device and method for measuring the influence range of coal seam blasting by using tracer gas. Background technique [0002] The influence range of underground coal mine blasting refers to the high-energy blasting gas in the coal seam borehole that uses chemical or physical principles to act on the borehole wall, thereby forming a fissure circle centered on the blasting borehole, that is, the maximum distance from the blasting point to the impact of the blast shock wave is Influence radius for blasting. Explosives or high-energy gas blasting are used underground in coal mines to increase the permeability of coal seams and improve the extraction efficiency of the coal seams. The coal seam blasting process directly destroys the original occurrence state of the coal body. It is difficult to determine the impact range of blasting by direct method...

AI Technical Summary

Problems solved by technology

Explosives or high-energy gas blasting are used underground in coal mines to increase the gas permeability of the coal seam and improve the extraction efficiency of the coal seam. The blasting process of the coal seam directly destroys the original state of the coal body. It is difficult to determine the blasting influence range by the direct method. Gas concentration changes or drill cuttings indicators are inspected. This rough inspection method cannot accurately reflect the scope of blasting influence.

The test error of the blasting influence range will lead to the following two points. First, the test influence range is higher than the real value, resulting in a blasting anti-reflection blind area, which affects the coal seam extraction effect; second, the test influence range is lower than the real value, resulting in an increase in the blasting anti-reflection engineering amount.

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