论文部分内容阅读
为了有效检测在各种工程实际中所使用的锚杆锚固质量,采用理论分析和实验室测试的方法分别研究了自由锚杆和锚固锚杆的高频超声导波传播规律,在2.25~15 MHz导波频率范围内,对不同锚固质量的锚固锚杆进行了扫频,并根据实验结果得出了不同锚固质量的锚杆的峰值比以及其随增益的变化曲线,与理论衰减频散曲线相吻合。研究结果表明,在一定的频率范围内,同一频率的峰值比几乎不随增益变化而变化,且对大于7.5 MHz的高频导波不适合用来检测锚杆锚固质量做出了初步研究。
In order to effectively detect the anchoring quality of anchors used in various engineering practice, theoretical analysis and laboratory tests were conducted to study the propagation of high-frequency ultrasonic guided waves in free-rock bolts and anchored anchors, respectively. At 2.25 ~ 15 MHz According to the experimental results, the peak ratios of bolts with different anchoring qualities and their curves with gain are obtained, and the results are compared with the theoretical attenuation dispersion curves Anastomosis. The results show that in a certain frequency range, the peak frequency of the same frequency almost does not change with the gain change, and for high frequency guided waves greater than 7.5 MHz is not suitable for the detection of bolt anchorage quality to make a preliminary study.