高速铁路路基沉降影响因素分析及模型预测方法研究

Study on Influencing Factors and Model Prediction Method of Subgrade Settlement of High Speed Railway

通过室内压缩试验与现场实测数据分析,研究了路基填筑高度、路基面宽度对高速铁路路基沉降的影响规律。建立黏弹性模型,通过数据拟合得到模型参数,从而对路基最终沉降进行预测。结果表明:在地基处理方法一致时,路基面沉降随路堤填筑高度增加而增大,随路基面宽度增加而增大,主要由于路基高度与宽度的增加使地基内应力增大,地基刚度不变,导致沉降增大;黏弹性模型分析方法根据路基沉降特点,能够反映路基填筑高度与宽度对沉降的影响,通过拟合得到弹性系数与黏性系数,进而预测路基最终沉降。

Through the analysis of both indoor compression test and field measurement data,the influence of subgrade filling height and subgrade surface width on subgrade settlement of high speed railway was studied.The viscoelastic model was established,and the model parameters were obtained by data fitting,so as to predict the final settlement of subgrade.The results show that the subgrade surface settlement increases with the increase of embankment filling height and subgrade surface width,when the foundation treatment method is consistent.The increase of the height and width of the subgrade could increase the internal stress of the foundation,and the stiffness of the foundation remains unchanged,resulting the increase of subgrade settlement.According to the characteristics of subgrade settlement,the viscoelastic model analysis method can reflect the influence of subgrade filling height and width on settlement.The elastic coefficient and viscosity coefficient are obtained by fitting method,and then the final subgrade settlement is predicted.