基于路面变形速度的弯沉测量方法

Deflection Measurement Methods Based on Velocities of Pavement Deflections

为了实现在正常交通速度20-80km/h下的连续弯沉测量,提出了采用测量路面变形速度反演弯沉的方法.研究利用激光多普勒测振仪测量路面在标准载荷作用下的路面变形速度的方法和路面变形速度提取算法,结合弹性地基上的欧拉-伯努利梁理论,推导弯沉盆曲线的两参数方程,采用牛顿迭代法利用路面变形速度反演路面弯沉.基于此方法设计的原型设备已在新疆、陕西、甘肃、天津、湖北等省市进行了近8×10^4 km的路测实验.结果显示,数据自重复性达到95%以上;与贝克曼梁测量数据对比,数据相关性达到90%以上.该方法一次测量只需要一次采样,测量与路面曲率无关,相对于传统测量方法,其适合于高速、无损测量.实验证明,该方法能满足路网级、逐车道的路面弯沉连续、无损、高密度、高速度测量的要求,具有广阔的使用推广价值.

To meet the demands of continuous deflection measurement at a traffic speed of 20-80 km/h, a novel method was proposed which substituted velocities of pavement deflections for absolute deflection. The measurement method and retrieve algorithm of velocities of pavement deflections with the standard loads were studied by using Doppler laser sensor. Based on the Bernoulli-Euler beam theory on an elastic foundation, the two-parameter solutions of deflection basin curve were deduced. Pavement deflection was inversed using velocities of pavement deflections with Newton Iteration method. The prototype system based on this method was applied to totally 40 000 km in Xinjiang, Shaanxi, Gansu, Tianjin, Hubei and other provinces in 2014. A large number of experimental data showed that the data repeatability could reach more than 95%. Compared with experimental data by Benkelman beam, its dependency was more than 90 %. The method requires only a single measurement sampling and is independent to the curvature of the road, which is suitable for high-speed, non-destructive measurement. The proposed method can meet the requirements of lane by lane, continuous, non-destructive, high-density, high-speed measurement at road network level, and has extensive promotion value.