基于洛杉矶磨耗试验和图像分析道砟劣化研究

摘要

To reveal the mechanism of ballast degradation,the Los Angeles abrasion test was conducted,and the 3D laser scanner was utilized for image index analysis before and after the test.During the test,the geometrical parameter of ballast particles were changing,including volume,shape,and abrasion loss.The outcome demon-strates that the main abrasion loss results from angularity breakage,the maximum abrasion depth is between 4-9mm,and the average abrasion depth is within 1 mm.The abrasion loss increases with ballast particle size.The results are useful for ballast material standard,degradation evaluation and maintenance.%通过洛杉矶磨耗试验研究道砟劣化，基于激光三维扫描及图形分析法，分析道砟洛杉矶试验前后三维图形信息，研究道砟体积、形状、尖角和表面粗糙度等几何特性变化，同时和磨耗试验结果进行比较，揭示道砟劣化机理及劣化表现形式。研究结果表明：道砟劣化形式主要为尖角折断，最大磨耗值范围在4．0～9．0 mm，平均磨耗值在1．0 mm以内；单个道砟磨耗率随着道砟粒径增大而增加。研究结果对道砟标准控制、劣化评估及养护维修具有参考意义。