锚杆锚固系统应力波分形机制及其应用研究

Research on Fractal Mechanism of Bolt Anchor System Stress Wave and Its Application

为研究锚杆振动系统应力波分形特性,采用分形理论的盒维数方法,建立了适用于锚杆振动信号的盒维数模型。结合锚杆工作荷载实验,计算得到了锚杆振动信号分形盒维数值D,从理论上探讨了锚杆振动信号波形的物理力学机制,解释了D与锚杆工作荷载之间的内在联系。研究表明,D与锚杆振动基频及锚固介质阻尼关系密切,振动基频反映了振动信号的不规则度和复杂度,而锚固介质阻尼直接影响振动信号的衰减,从而影响D的数值大小。将锚杆无损检测与分形理论结合,为锚杆无损检测分析领域提供了全新的研究思路。

For studying the stress wave fractal characteristics of bolt vibration system,using the fractal box-dimension method was used to,according to the propagation and characteristics of bolt vibration signal,establish the double scale rectangular box dimension model.Combined with the bolt working load experiments,calculations were carried out to obtain the bolt vibration signal fractal box dimension values D,the physical mechanism of anchor vibration signal waveform was theoretially discussed,and the relationship between Dand the bolt working load was revealed.Research shows that,Dis close to the fundamental frequency and the anchoring medium damping,vibration fundamental frequency reflects the irregularity and complexity of the vibration signal,and the anchoring media damping directly affects the vibration signal attenuation,and thus affects the Dnumerical size.Combining fractal theory with anchor nondestructive testing will provide a new research idea.