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

Abstract

The invention discloses a microwave power adaptation adjusting and control system and method for engineering rock cracking. The microwave power adaptation adjusting and control system comprises an impedance matching adjuster, a microwave power controller and a temperature sensor. The microwave power adaptation adjusting and control method comprises the steps that through a microwave generator, microwaves are input into the impedance matching adjuster, through the impedance matching adjuster, the microwave power is subjected to initial matching adjusting, then the microwaves are transmitted toa microwave heater, and through the microwave heater, rock is subjected to microwave cracking; part of microwave energy is absorbed by the rock, and the other part of microwave energy is reflected into the impedance matching adjuster through the microwave heater, and through the impedance matching adjuster, the microwave incident power and reflection power are recorded; and temperature data of therock collected by the temperature sensor during microwave cracking are fed back to the microwave power controller, the microwave power controller calculates the microwave power meeting impedance matching through the temperature and reflection coefficients on the basis of the incident power and the reflection power, microwave power data are fed back into the impedance matching adjuster, and the microwave power is subjected to impedance real-time matching.

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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