树脂锚杆锚固长度声波探测技术及数值试验

Acoustic detection technique and numerical on anchorage length test of resin bolt

针对煤岩巷道锚杆支护锚固失效引起的冒顶问题,建立了煤岩巷道顶板锚杆树脂锚固模型,采用数值模拟的方法对不同锚固方式下树脂锚杆的波导特性进行研究,得到了不同锚固长度与树脂锚杆激振响应特性曲线。通过对比分析,研究得出无论何种锚固方式,检测结果与实际锚固长度的误差大约在1%-6%,同时可采用修正补偿的方法降低检测误差。研究结果得出:采用应力反射波法检测树脂锚杆的锚固长度是一种行之有效的无损检测方法,可实现树脂锚杆锚固长度的便携、准确检测提供技术支持。

Aiming at the roof fall problems , due to the anchorage invalidation in coal and rock roadway supported by bolts, in this paper , a resin anchor fixation model of roof bolt in coal and rock roadway was established .By using numerical simulation method , the research on the waveguide characteristics of resin bolt under different anchoring types was conducted , and the excitation response characteristic curves of resin bolt with different anchorage length were obtained .The comparison analysis showed that no matter what kinds of anchoring type , the testing results and the practical errors were about 1%-6%.Meanwhile , crushing compensation method could be adopted to decrease detection error .The result showed that the reflected stress wave is a useful and valuable nondestructive testing method .It can realize portable , accurate testing of anchoring length .