黄土地区高速铁路高边坡路基帮宽沉降分析

Analysis on Settlement of High Slope Widened Subgrade of High-speed Railway in Loess Area

为研究黄土地区高边坡路基帮宽施工对既有高铁路基附加沉降的影响规律,采用了实时化、可视化、远程化、自动化的静力水准监测方案,对并行段落既有高铁路基进行了2年的持续监测,并运用数据采集、数据滤波、数据平滑等处理方法,得到了高铁路基沉降监测点纵断面、横断面的累计沉降监测结果以及不同施工内容与沉降曲线的对应关系。研究表明,高边坡路基帮宽施工对既有高铁沉降变形影响较大(影响最大值为73.2 mm),既有路基的沉降变形程度受填土量和涵洞等因素的控制。

In order to study the influence of high slope subgrade widening construction in the loess area on additional settlement of the existing high-speed railways subgrade,a real-time,visualized,remote and automatic static leveling monitoring scheme was adopted for continuous monitoring over existing railway subgrade in parallel sections for 2 years,and data acquisition,data filtering,data smoothing and other processing methods were used to obtain cumulative settlement monitoring results of the longitudinal and transverse sections of the high-speed railway subgrade settlement monitoring points and the corresponding relationship between different construction and settlement curve.The results showed that high slope subgrade widening construction significantly affected the settlement and deformation of the existing high-speed railways(up to 73.2 mm),and the settlement and deformation of existing subgrade were controlled by such factors as earth fill volume and culvert.