Prediction of land subsidence along Tianjin-Baoding high-speed railway using WT-RF method
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摘要: 地面沉降是一种由多种因素引发的区域地面高程下降的环境地质现象,一定程度上会降低高速铁路的平顺性,影响高速铁路安全运营。针对传统随机森林模型对时序数据预测时未考虑数据内部复杂规律问题,该文构建基于小波变换的随机森林模型(wavelet transform-random forest,WT-RF),预测高铁沿线地面沉降信息,评价地面沉降对高铁坡度变化的影响。研究结果表明,2016—2018年,累积地面沉降影响津保高铁坡度变化范围为0~0.16‰; 基于WT-RF模型对地面沉降预测具有较高精度; 2018—2020年,地面沉降仍呈现加重趋势。津保高速铁路沿线坡度变化范围虽然在0~0.2‰之间,但较目前呈现增大趋势。研究发现地面沉降对津保高铁坡度变化具有影响作用,需控制地面沉降,保证高速铁路的安全运营。Abstract: Land subsidence is an environmental geological phenomenon caused by many factors, and it can reduce the smoothness of high-speed railways and thus affects the safe operation of high-speed railways. Traditional rardom forest models do not take account of the internal complexity of time series data in the prediction of time series data. Therefore, this paper constructs a wavelet transform-random forest (WT-RF) prediction model, predicts the land subsidence along the Tianjin-Baoding high-speed railway using the model, and assesses the impacts of land subsidence on the changes in the slope of the high-speed railway. The results are as follows: ① From 2016 to 2018, the change range of the slope of the Tianjin-Baoding high-speed railway was 0~0.16‰ due to the cumulative land subsidence. ② The WT-RF model showed high prediction accuracy of the land subsidence. ③ From 2018 to 2020, the land subsidence still showed an increasing trend, although the change range of the slope along the Tianjin-Baoding high-speed railway was 0~0.2 ‰. It can be concluded that the land subsidence has an impact on the changes in the slope of the Tianjin-Baoding high-speed railway. Therefore, it is necessary to control the land subsidence to ensure the safe operation of the high-speed railway.
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Key words:
- land subsidence /
- Tianjin-Baoding high-speed railway /
- wavelet transform /
- rardom forest
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