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对土介质中的全长注浆锚杆进行了固有特性分析,推导了锚杆固有频率和固有振型的计算公式。考虑对永久震动环境中能否设计永久锚杆缺少经验,对所涉及的列车激励场地做了动力测试和频谱分析,以避免使支护构件的自振频率接近该场地中外界激励的优势频率和介质的一阶卓越频率。研究表明锚杆一阶纵向自振频率、场地卓越频率、列车优势频率分布于不同的频带,列车激励不致造成锚杆的共振。通过这一分析,为进一步认识锚杆支护结构在复杂环境下的适用性问题提供了参考。
The inherent characteristics of full-length grouting anchor in soil are analyzed, and the formulas of natural frequency and natural mode of anchor are deduced. Considering the lack of experience in the design of permanent anchors in the permanent vibration environment, dynamic tests and spectrum analysis of the involved train excitation sites are conducted in order to avoid that the natural frequencies of the supporting members are close to the dominant frequencies of excitation outside the field and First-order frequency of medium. The research shows that the first longitudinal natural frequency of anchor, the excellent frequency of the site and the dominant frequency of the train distribute in different frequency bands, and the train excitation will not cause the resonance of the anchor. Through this analysis, it provides a reference for further understanding of the applicability of bolting structures in complex environment.