| 摘要: |
| 为全面、准确评价沥青路面拥包严重程度,实现三维指标的自动计算,利用室内三维激光检测设备获取高精度、高密度的拥包模型激光点云数据,采用Lowess算法进行数据预处理,再利用RANSAC算法获取拥包下底面轮廓数据,基于HARR矩阵建立拥包三维模型. 在此基础上,利用高差法和微元逼近法分别计算了拥包的最大高度、下底面积、隆起体积与行车方向最大坡度等三维指标；对比轻、重两个严重等级的拥包三维指标计算结果,研究激光线纵向间距对指标计算误差的影响规律. 结果表明:当激光线纵向间距为0.5 mm时,拥包最大高度、下底面积、隆起体积和行车方向最大坡度的相对误差分别不超过3.28%、2.17%、3.76%和1.97%；随着激光线纵向间距逐渐增大至10 mm,拥包三维重构模型产生部分缺失,导致拥包三维指标相对误差逐渐增大；当间距为5 mm时,三维指标计算最大相对误差分别为3.49%、4.65%和7.11%和7.27%；当间距为10 mm时,隆起体积和行车方向最大坡度的相对误差均超过10%；建议采用三维激光技术对拥包进行检测时,纵向间距设置不大于5 mm,以保证拥包三维指标计算结果准确性. 三维指标计算方法可评价拥包严重程度,评估行车安全风险. |
| 关键词: 沥青路面 拥包 三维激光 三维指标 激光纵向间距 |
| DOI：10.11918/j.issn.0367-6234.201807060 |
| 分类号:U418.6 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51508034)； 交通运输行业重点科技项目(2018-MSI-018)； 内蒙古自治区交通运输科技项目(NJ-2018-28) |
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| Three-dimensional indicators calculation method for asphalt pavement shoving |
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HUI Bing1,2,LIANG Haimei1,TSAI Yichang1,3
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(1. School of Highway,Chang’an University, Xi’an 710064, China; 2. Key Laboratory of Ministry of Education of Highway Engineering in Special Area, Xi’an 710064, China; 3. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta 30314, America)
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| Abstract: |
| To comprehensively and accurately evaluate the severity degree of asphalt pavement shoving, as well as realize the automatic calculation of the corresponding three-dimensional indicators, the indoor three-dimensional laser detection equipment was used to obtain high-precision and high-density surface laser point cloud data of shoving models, and the Lowess algorithm was adopted for data preprocessing. The RANSAC algorithm was then utilized to extract the contour data of the bottom of the shoving0, and the three-dimensional model of the shoving was established based on the HARR matrix. On this basis, the height-difference method and the micro-element approximation algorithm were used to calculate the three-dimensional indicators such as the maximum height, bottom area, uplift volume, and the maximum slope of the driving direction of the shoving. The calculation results of the three-dimensional indicators of two severity levels of light and heavy were compared, and the influence of laser line longitudinal spacing on calculation error was studied. Results show that when the longitudinal spacing of the laser line was 0.5 mm, the calculated relative errors of the maximum height, bottom area, uplift volume, and the maximum slope of the driving direction were less than 3.28%, 2.17%, 3.76%, and 1.97%, respectively. As the spacing increased to 10 mm, the relative error of the three-dimensional indicators of the shoving gradually increased due to the partial missing of the shoving model. When the spacing was 5 mm, the maximum relative error of the three-dimensional indicators was 3.49%, 4.65%, 7.11%, and 7.27%, respectively. When the spacing was 10 mm, the relative errors of the uplift volume and the maximum slope of the driving direction both exceeded 10%. It is recommended that when using three-dimensional laser technology to measure shoving, the longitudinal spacing should be not more than 5 mm to ensure the accuracy of the calculation results of the three-dimensional indicators. The three-dimensional indicators calculation method can evaluate the severity of the shoving and assess traffic safety risk. |
| Key words: asphalt pavement shoving three-dimensional laser three-dimensional indicators laser longitudinal spacing |
