The rapid decrease of load on bolts may be used as an i…

提出可用锚杆载荷迅速下降作为围岩失稳的预警指标。

Especially, rapid decrease of amplitude of viscoelastic beams will happen when-exciting frequencies are considerably high.

当干扰频率很高时，随着干扰频率的增大振幅迅速减小。