A microwave power adaptive control system and method for engineering rock mass fracturing

Abstract

A microwave power adaptive control system and method for engineering rock mass cracking. The system includes an impedance matching regulator, a microwave power controller and a temperature sensor; the method is: input microwaves into the impedance matching regulator through a microwave generator, and pass the impedance The matching regulator performs initial matching adjustment on the microwave power, then transmits the microwave to the microwave heater, and uses the microwave heater to crack the rock mass; part of the microwave energy is absorbed by the rock mass, and the other part is reflected back to the impedance matching through the microwave heater. In the regulator, the microwave incident power and reflected power are recorded through the impedance matching regulator; the temperature data of the rock mass during microwave cracking collected by the temperature sensor are fed back to the microwave power controller. The microwave power controller takes the incident power and reflected power as Based on this, the microwave power that meets the impedance matching is calculated through temperature and reflection coefficient, and then the microwave power data is fed back to the impedance matching regulator, and the impedance matching of the microwave power is performed in real time.

Description

technical field [0001] The invention belongs to the technical field of rock mass engineering and mining engineering, and in particular relates to a microwave power self-adaptive control system and method for engineering rock mass fracturing. Background technique [0002] Microwave-assisted rock-breaking technology is a new rock-breaking technology with great potential. Before cutting rocks with mechanical tools, microwaves are used to pre-irradiate rocks to reduce mechanical properties such as uniaxial compression, tensile strength, and point load strength. The problem that the cutter is easy to wear when the mechanical method breaks the hard rock can improve the rock breaking efficiency and reduce the rock breaking cost. The microwave-assisted fracturing technology can effectively release the stress of the deep rock mass, and increase the pre-cracking of the rock mass on the basis of the stress release hole, so as to form a fracture zone inside the surrounding rock, reduce ...

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Problems solved by technology

[0003] At present, the technical scheme of using microwave to crack engineering rock mass is still mainly in the stage of indoor experiment. The microwave power output by the microwave generator acts on the rock sample in a constant state, but because the temperature of the rock sample changes greatly, it will cause The microwave characteristics (dielectric constant, dielectric loss, etc.) of the rock sample will also change greatly accordingly, and finally the load impedance of the rock sample has a dynamic characteristic, that is, the load impedance of the rock sample changes dynamically. At this time, if the constant microwave power acts on the rock sample, it will inevitably lead to impedance mismatch, and the direct consequence is the increase of microwave reflection power, which will not only reduce the stability of microwave equipment, but also reduce the utilization efficiency of microwave energy.

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