Evaluation of roadbed service status based on the correlation analysis between TQIand roadbed settlement——Take Shanghai–Nanjing intercity railway as an example
基于TQI与路基沉降关联性分析的路基服役状态评估——以沪宁城际铁路为例

摘要

作为我国最繁忙的高速铁路之一，沪宁城际铁路每次轨检车动态检测间隔一般为2周/次，沉降监测平均6-9个月甚至超过一年才一次，且因软土地基结构之故，极易发生较快速率的沉降，故相比于常态化高频次的轨检车动态监测，高铁路基沉降监测数值存在时间迟滞性问题。而TQI在实际应用中，对于沉降超出200m的区域，其敏感性反映不甚明确，故无论是路基沉降的监测频次还是里程上检测的精确度，对高铁实际运营指导下做出的判定与高铁安全性、高效性等应用目标之间会有脱节问题。据此，本文将基于TQI与路基沉降之间的关系，探讨其对高铁路基服役状态的预测可行性，旨在为高速铁路运输的安全性、高效性和稳定性提供了一定的保障。

Abstract

As one of the busiest high-speed railways in China, the dynamic detection interval of each rail inspection vehicle on Shanghai–Nanjing intercity railway is generally 2 weeks/time, and the settlement monitoring is only once every 6-9 months or even more than a year on average. Moreover, due to the soft soil foundation structure, it is very easy to have a relatively rapid rate of settlement. Therefore, compared with the normal high-frequency rail inspection vehicle dynamic monitoring, the high-speed railway subgrade settlement monitoring value has the problem of time lag. In practical applications, the sensitivity of TQI is not very clear for areas with settlement exceeding 200m. Therefore, whether it is the monitoring frequency of roadbed settlement or the accuracy of mileage detection, there may be a disconnect between the judgments made under the guidance of high-speed rail operation and the application goals of high-speed rail safety and efficiency. Based on this, this article will explore the feasibility of predicting the service status of high-speed railway subgrade based on the relationship between TQI and subgrade settlement, aiming to provide certain guarantees for the safety, efficiency, and stability of high-speed railway transportation.