混凝土路面板下脱空识别的瞬态冲击响应法研究

在总结当前混凝土路面板脱空检测方法的基础上,提出了用于脱空识别的瞬态冲击响应法。通过脱空路面板的模型试验具体阐述了该方法在脱空识别中的使用,结合测点振幅的三次样条拟合曲线提出了脱空边界的"零斜率"判别法。试验结果表明实际的脱空边界是一个模糊的区域,而采用"零斜率"判别法得到的脱空区域略偏于保守。最后通过在实际混凝土路面上进行的测试验证了瞬态冲击响应法的可行性。该方法同时也为今后的细化研究和相关测试仪器的开发打下了基础。

Study on Identification of Cavity Area under Concrete Pavement Using Transient Impulse-response Method

Based on the existing detection methods of cavity areas under concrete pavement, the transient impulse-response method for cavity detection was put forward. The detailed operation process of cavity detection was described by model test, and the Zero Slope Identification method was put forward through the cubic spline fitting curves of amplitudes at measuring points. The test result indicates that the real boundary of cavity slab is a fuzzy zone, and the cavities identified by the Zero Slope Identification method  are little larger than real ones. Finally, the tests on the real concrete pavements also verified the feasibility of transient impulse-response method, and the method also established the foundation of detailed researches and development of measuring instrument in the future.