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针对当前锚杆锚固质量弹性波检测理论研究工作欠缺的问题,开展了锚杆锚固体系条件下弹性波传播的正演问题研究.论文编写了二维弹性波交错网格有限差分程序,并在围岩、砂浆及缺陷等各种因素变化的条件下进行了相应的数值模拟计算.通过对计算结果的分析,获得了两个重要结论:1)围岩及砂浆的波速变化不会影响锚杆杆底反射波的波至时间,但其频率会随之有所降低;2)砂浆缺陷的大小会影响锚杆杆底反射波的振幅.砂浆缺陷越大,钢筋底部反射波的振幅越大.论文指出:上述结论可能会为锚杆锚固体系砂浆饱满度的求取提供一种新的途径.
Aiming at the problem that the research on the elastic wave detection theory of anchoring bolt is lacking, the forward problem of elastic wave propagation under the anchoring system of anchoring bolt is studied.In the paper, the finite difference program of two-dimensional elastic wave interleaving grid is compiled, Rock, mortar and defects under the conditions of various factors such as changes in the conditions of the corresponding numerical simulation.By analyzing the calculation results obtained two important conclusions: 1) wall rock and mortar wave velocity changes will not affect the anchor rod The frequency of the bottom reflected wave will decrease, but the frequency will decrease accordingly.2) The size of the mortar defect will affect the amplitude of the reflected wave at the bottom of the anchor rod, the larger the mortar defect, the larger the amplitude of the reflected wave at the bottom of the rebar. It is pointed out that the above conclusion may provide a new way for obtaining the mortar fullness of anchor system.