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Experimental Research on Fiber Grating Sensor Acoustic Emission Detection of Rock Material Specimen Failure

机译：岩石材料纤维光栅传感器声发射检测试验研究

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摘要

Acoustic emission is an important physical phenomenon when materials are deformed and fractured due to inner distortion or outer loading. It is also a direct parameter to show the mechanical property of rocks. Detecting or monitoring acoustic emission is significant in rock material failure theory and engineering. Because electromagnetism ultrasonic detection implements have some disadvantages of poor interference immunity, low sensitivity and inferior reliability, acoustic emission detection based on fiber Bragg grating (FBG) sensor is put forward to monitoring rocks. The strain and ultrasonic detection principles of FBG sensors are analyzed, at the same time, experimental system based on FBG ultrasonic sensor detection is also set up to simulate ultrasonic detection. The testing results of 500kHz acoustic shock signal and response are shown. A numerical simulation code RFPA is used to study rock acoustic emission. Mud and sand materials from river are used to process rock specimen. Rock specimen failure experiments are fulfilled via numerical control press device, which generate acoustic emission during the process of rock deformation and failure. Rock acoustic emission experimental signals' energy and counts are detected by FBG ultrasonic sensor detection system, which elementally proves FBG sensor can detect acoustic emission. Simulation and experiments of rock specimen give some useful results. All these show that FBG ultrasonic sensor can monitor rock distortion and failure effectively and is a novel technology and method in rock engineering.
机译：声发射是由于内部变形或外部载荷而变形和破裂时的重要物理现象。它也是显示岩石力学特性的直接参数。岩石材料衰竭理论和工程中检测或监测声发射是显着的。因为电磁超声波检测工具具有差的干扰免疫，低灵敏度和可靠性差的一些缺点，基于光纤布拉格光栅（FBG）传感器的声发射检测被提出来监测岩石。分析了FBG传感器的应变和超声检测原理，同时，基于FBG超声波传感器检测的实验系统也设立了模拟超声波检测。显示了500kHz声响冲击信号的测试结果和响应。数值模拟代码RFPA用于研究摇滚声发射。来自河流的泥土和砂材料用于处理岩石标本。通过数控压力装置实现岩石样品失效实验，该装置在岩石变形和失效过程中产生声学发射。通过FBG超声波传感器检测系统检测到岩石声发射实验信号的能量和计数，该系统基本上证明了FBG传感器可以检测声学发射。岩石标本的模拟和实验给出了一些有用的结果。所有这些都表明，FBG超声波传感器可以有效地监测岩石变形和失效，是岩石工程中的新技术和方法。

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