High-stress roadway surrounding rock liquid-phase plasma blasting pressure relief method

Abstract

The invention discloses a high-stress roadway surrounding rock liquid-phase plasma blasting pressure relief method. The method is suitable for stress release and roadway support of deep high-stress roadway surrounding rock. According to the method, through the shock wave expansion function of high-temperature, high-voltage and high-density liquid phase ion plasmon cluster generated after strong discharge is carried out in an electrolyte solution to rocks surrounding a pressure relief hole, an explosion-expanding cavity and a fracture zone are formed in the surrounding rocks at a shallow part of a roadway so that the high stress of the shallow part of the roadway can be released and transferred to the deep surrounding rock at the bottom of the pressure relief hole, and therefore the stresslevel of the shallow surrounding rock of the precipitation roadway is achieved, the stability of the surrounding rock of the roadway is kept, and the supporting quality of the roadway is improved. Compared with a traditional blasting pressure relief method taking industrial explosives as energy sources, the method has the greatest advantage that great reduction is achieved, the situation that thesurrounding rock of the roadway surrounding the pressure relief blasting position is damaged even collapsed is eliminated, meanwhile, no dust is generated, no firecracker smoke is generated, no toxicand harmful gas is generated, throwing is avoided, noise is low, and cost is low.

Description

technical field [0001] The invention relates to a liquid-phase plasma blasting pressure relief method for a high-stress roadway, which is suitable for the stability control and support of the surrounding rock of the high-stress roadway, and belongs to a very important auxiliary means in the practice of the stability control of the surrounding rock of the high-stress roadway and the roadway support. Background technique [0002] In the process of surrounding rock deformation control and support for high-stress roadways, the traditional method is to excavate pressure relief grooves first, or adopt blasting pressure relief methods to improve the stress state of roadway surrounding rocks, and then implement bolts or other supports. means to control the deformation of surrounding rock. Excavating pressure relief grooves is a relatively large amount of work, time-consuming and labor-intensive, and is rarely used on site. The method of blasting to improve the high stress state of ...

AI Technical Summary

Problems solved by technology

[0004] However, in practice, while pressure relief blasting improves the stress state of the surrounding rock of the roadway, it almost inevitably causes damage and collapse of the surrounding rock at the side of the roadway in the blasting section, and sometimes even affects the surrounding rock at the top of the roadway. Difficulty and cost of support

[0005] In addition, during the implementation of pressure relief blasting, there will be a large amount of smoke, toxic and harmful gases, and other harmful effects such as explosion noise, among which the most serious and unacceptable is the damage to the surrounding rock of the roadway

Therefore, pressure relief blasting has high requirements on the design of blasting parameters, control of the implementation process, and the technical level of operators, which is also the main reason why it is difficult to popularize the measure of blasting pressure relief on a large scale.

[0006] The biggest problem with the traditional blasting and pressure relief method using industrial explosives as the energy source is that it is difficult to accurately control the energy of the explosive explosion. After blasting, it will cause damage to the roadway in the section where the pressure relief blasting is carried out, including the surrounding rock at the side of the roadway and the surrounding rock at the top. , sometimes even a large area of ​​section roadway collapses; in addition, a large amount of dust, toxic and harmful gases, and high explosion noise will be generated during the blasting process, so it usually takes about 15-20 minutes to eliminate the gun smoke after the blasting time, otherwise the health and safety of workers will be endangered

Images