基于嵌入式MEMS无线传感器的路面损伤监测技术研究

Research on damage detection in pavement structures based on embedded MEMS wireless sensors

基于智能传感技术的路面健康监测对道路养护管理具有重要意义。提出了一种基于嵌入式MEMS无线传感器的路面损伤监测技术,解决传统路面检测技术耗时耗力、无法实时监测的缺陷。通过数值模拟和室内试验对所提出监测技术进行了评价。采用三维有限元模型分别对健康和劣化路面结构在移动荷载作用下的响应特性进行了研究,并提出了一种定量评价路面结构损伤特性的指数DI;通过对水泥混合料进行三点弯曲(TPB)断裂试验,研究了嵌入式MEMS无线传感器在监测裂缝扩展中的有效性,嵌入式MEMS传感器记录的应力可以用来表征裂缝扩展的不同阶段,有效地检测道路裂缝病害。

Pavement health monitoring based on intelligent sensing technology is of great signiffcance for road maintenance and management.A new approach is presented for the continuous health monitoring of pavements using embedded MEMS wireless sensors.It solves the defects of traditional road damage detection technology which is time-consuming and labor-intensive and cannot be monitored in real time.Numerical and experimental studies were carried out to evaluate the damage detection performance of the proposed embedded MEMS wireless sensors.3D finite element models are employed to investigate the response characteristics of healthy and degraded pavement structures under moving loads,whereby an index DI is proposed to quantitatively evaluate the damage characteristics.The effectiveness of embedded MEMS wireless sensors in monitoring crack expansion was investigated by performing three-point bending(TPB)fracture tests on cement mixes.The stresses recorded by the embedded MEMS sensors can be used to characterize the different stages of crack expansion and effectively detect road crack damage.