超声波振动频率对岩石破碎规律的影响

The Effects of Ultrasonic Vibration Frequency on the Rules of Rock Crushing

超声波振动碎岩是一种新型碎岩技术,它在提高硬岩破碎效率上具有很大的优势和潜力。通过超声波换能器直接对岩石加载超声波振动,在宏观上借助万能试验机观察岩石抗压强度的变化情况,并通过核磁共振扫描仪细观上观察孔隙度的变化情况。采用宏、细观结合的方式,探究岩石在不同频率的超声波振动下的破碎规律。通过研究发现:岩石孔隙度与抗压强度呈反比关系。在振动频率为35kHz时,岩石抗压强度降低最大,幅度41.67%。

As a new technique,the ultrasonic vibration rock crushing method possesses huge advantages and potentials in improving the hard rock crushing efficiency.The ultrasonic vibration can be directly applied to rocks via the ultrasonic transducer and observe the variation of rocks'compressive strength via the universal tester macroscopically,as well to observe the variation of porosity via the MRI scanner.A combination of macroscopic and microscopic observations is adopted to explore the rules of rock crushing under ultrasonic vibrations with various frequencies.It can be concluded from the research that:the rock's porosity is inversely proportional to its compressive strength.With the vibration frequency of 35 kHz,the rock's compressive strength is decreased by 41.67% at most.