Carbon dioxide blasting impact dynamic monitoring test device and test method thereof

Abstract

The invention discloses a carbon dioxide blasting impact dynamic monitoring test device. The carbon dioxide blasting impact dynamic monitoring test device comprises a CO2 blasting impact test system,wherein the CO2 blasting impact test system is provided with a dynamic stress test system and a static stress test system; the CO2 blasting impact test system consists of a stress loading mechanism, ablasting impact mechanism and a gas collection mechanism; the stress loading mechanism comprises a test piece stress loading part and two ring flanges; the two ring flanges are arranged one after theother side by side; and the stress loading part is arranged between the two ring flanges. The carbon dioxide blasting impact dynamic monitoring test device can perform in-situ integral test on dynamic information of coal bodies under blasting impact, and has the beneficial effects that I, a cylindrical test piece adopted in the test can be directly taken from the site, so that the disturbance ofindoor machining on the original structure of the test piece is avoided; II, an impact source is provided by liquid CO2 phase change blasting, so that butt joint of the test piece is facilitated, andthe blasting performance parameters can be controlled conveniently; III, various observation sheets can be arranged conveniently; and IV, the problems of heaviness, high cost and inconvenience in thetest for large test pieces are solved.

Description

technical field [0001] The invention belongs to the application of CO in the control of coal mine gas 2 The technical field of blasting impact increasing coal seam permeability, in particular relates to a carbon dioxide blasting impact dynamic monitoring test device. Background technique [0002] Engineering practice in recent years has proved that CO 2 Explosion enhancement is an advanced intrinsically safe technology for gas control in low-permeability coal seams. Low-permeability and high-gas coal seams pass through CO 2 Blasting increases permeability, forming a multi-scale radial fracture circle in the coal seam, that is, the fracture pressure relief circle. In the fracture pressure relief circle, the geostress field and gas pressure field are redistributed and changed. Under this effect, the permeability of the coal seam increases by 1 to 2 orders of magnitude, and the gas drainage concentration and flow rate increase by 1 order of magnitude. The time to meet the mi...

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Problems solved by technology

[0003] However, currently for CO 2 The mechanism of blasting shocks to create cracks and increase permeability is not very clear, so there is no scientific evaluation model for the increase of on-site permeability, which is likely to lead to wrong estimates of on-site anti-reflection effects and bring hidden dangers to safe production

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