软基高铁TQI与路基沉降对比研究
Comparative study on the TQI and subgrade settlement of the high-speed railway in soft soil foundation

TQI超限可反映轨道几何形态差异过大,由此可说明线路平顺性不足,高铁运营安全及舒适性面临威胁。现有研究未阐明软土路基沉降与TQI超限是否存在对应关系,导致无论采用控制TQI或沉降指导软基高铁养护维修,均存在模式难以统一的问题。为探究此问题,科学指导养护管理,采用数理统计的方法对沪宁城际高速铁路运营期间TQI与路基沉降数据进行对比研究。研究结果表明,路基沉降与TQI超限关联性较高,多数路基沉降超限区段被包含于动检TQI超限区段中;在TQI各类单项指标中,高低、三角坑及水平指标与路基沉降间相关性较为显著,并分别与之呈现出线性相关关系。经分析,建议工务部门在以TQI作为软基高铁养护维修主要参考标准的同时,强化单项指标的分析并对高低、水平、三角坑单项指标较大或超限的路基区段进行沉降观测,确定沉降量是否过大,以便结合两者最不利情况,合理制定维修计划。
The TQI overrun can reflect the great difference of track geometry. The high speed railway operation safety and comfort are threatened because of the track irregularity. The existing research has not clarified whether there is a corresponding relationship between soft soil subgrade settlement overrun and TQI overrun. Thus, there are two inconsistent railway maintenance method, which causes trouble for the maintenance department. In order to explore this issue and provide scientific guidance for track management and maintenances, the TQI data and the subgrade settlement data of Shanghai Nanjing Intercity High-speed Railway during operating period were compared and analyzed based on the method of mathematical statistics in this paper. The results show that, there is a certain correlation between the TQI and the subgrade settlement, and the TQI overrun sections contain most of the subgrade settlement overrun sections. Among all TQI single indexes, longitudinal level irregularity index, horizontal level irregularity index and twist irregularity index are significantly correlated with subgrade settlement. Furthermore, there is a linear positive correlation between longitudinal level irregularity index, horizontal level irregularity index, twist irregularity index and subgrade settlement. After analysis, if the TQI was used as major reference standards of for maintenance, the maintenance department needs to strengthen the analysis of TQI single index. When the data of longitudinal level irregularity index, horizontal level irregularity index and twist irregularity index is too large or even exceed the management value in a determination section. Maintenance department should conduct settlement observation in order to determine whether there is a settlement overrun section, and unify the most unfavorable situation of subgrade settlement and TQI to make reasonable maintenance plan