基于冲击回波法识别无砟轨道混凝土结构中的蜂窝伤损深度研究

Identify the Depth of Honeycomb in Ballastless Track Concrete Structure Based on Impact-echo Method

为了研究高速铁路无砟轨道混凝土结构相继出现不同程度的伤损问题,借助于有限元软件ANSYS LSDYNA 3D数值模拟冲击回波,研究应力波在轨道板中的传播速度和传播规律,采用冲击回波法识别轨道板中蜂窝伤损的深度。研究结果表明:应力波在蜂窝伤损和砂浆界面发生反射,在频谱图中形成不同峰值,通过频谱伤损定位原理可以确定出轨道板中蜂窝伤损的具体深度。

To study the different degrees of damages in ballastless track concrete structure encountered in the operation of railway ballastless track, this paper uses the finite element software ANSYS LS-DYNA3D to simulate the impact-echo and learn the propagation speed and rules of the stress wave in the track slab, and employs the impact-echo method to identify the depth of damage in the track slab. The results show that the stress waves reflect on honeycomb and mortar interface and generate different peak values in frequency spectrum graph, and the specific depth of honeycomb can be calculated according to the principle of frequency spectrum to locate damages.