Method for detecting pressure relief blasting effect of hard roof

Abstract

The invention discloses a method for detecting the pressure relief blasting effect of a hard roof. The method includes the specific steps that firstly, a detection position is determined, wherein a hole is drilled in the position which is 20 m to 30 m away from a fracture causing area, and a vibration wave receiving device is arranged on the portion, 100 m to 200 m away from the fracture causing area, of the same side of the drilled hole; secondly, miniature blasting is conducted, wherein explosives are injected into the drilled hole so that miniature blasting can be conducted; thirdly, oscillatory waves are detected, wherein the vibration wave receiving device receives oscillatory waves generated in the miniature blasting process, waveform processing is conducted on the oscillatory waves, and the oscillatory waves are transmitted to a display device to be displayed; fourthly, the propagation velocity V of the oscillatory waves in the rock stratum is obtained; fifthly, the extension radius of a fracture area is calculated. A user does not need to drill multiple holes, operation is easy while the work amount is reduced, the extension radius and the fracture development degree of fractures of the fracture area are obtained, and therefore the fracture causing effect is accurately known.

Description

technical field [0001] The invention relates to a method for detecting the blasting effect of pressure relief on a hard roof, belonging to the technical field of coal mine detection. Background technique [0002] In recent years, with the increasing depth of coal mining in my country, the problem of rock shock in many mining areas has become more and more serious. A large part of the reason for this problem is that the roof of the goaf is too hard to collapse. Therefore, in order to solve the problem that the hard roof of the stope is difficult to collapse, hydraulic or blasting fracturing methods are generally used to increase the crack degree of the roof, thereby weakening the integrity of the roof, making the roof more conducive to collapse, and reducing the risk of rock burst sex. In the process of hydraulic and blasting fracturing, it is possible to find out the expansion radius of the fissures and the degree of development of the fissures in the fissure area, which ca...

AI Technical Summary

Problems solved by technology

Traditional fracture detection methods generally use drilling, drilling imaging or high-pressure water detection methods. This type of method requires drilling a network of drilling holes in the fracture area, and the number of drilling holes required is relatively large. Generally, a drilling hole needs to be drilled every few meters. , the amount of work is relatively large, the process is more complicated, and the cost is higher

In addition, this method has a shortcoming, its detection accuracy is relatively low

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