地铁列车荷载作用位置对道床与管片剥离的影响研究

Study on Influence of Load Position of Subway Train on Track Bed and Segment Stripping

城市地铁盾构区间隧道若出现道床与管片剥离病害,会直接威胁到列车的运行安全。以某地铁区间线路为背景,通过数值模拟研究了列车运行过程中对道床和管片剥离影响最大的荷载位置。根据荷载作用在道床上的不同位置,发现荷载在远离道床伸缩缝的过程中相邻道床底部的拉应力值急剧减小,确定了荷载最不利位置为道床靠近伸缩缝处,可为模型试验和病害治理提供参考。

If the stripping disease of track bed and segment in shield tunnel of the metro in a city happens,it directly threatens the safety of train operation.Taking the line of a certain section of the metro in a city as the background,it studies the load position which has the greatest influence on track bed and segment stripping during train operation by numerical simulation.When the load is applied to different positions on the track bed,it is found that the tensile stress value at the bottom of the adjacent track bed decreases sharply when the load is far away from the expansion joint of the track bed.The most unfavorable position of the load is determined to be the place where the track bed near the expansion joint,which can provide a reference for model test and disease treatment.