Settlement Prediction of High-speed Railway Composite Subgrade via Selection of Elastic Modulus Correction Parameter by Considering Foundation Modulus
Accurate prediction of subgrade settlement is important to safe operation of high-speed railway.Herein a method predicting the composite subgrade settlement,which selects the elastic modulus correction parameter by taking foundation modulus into consideration,was proposed.The numerical simulation with Midas GTS-NX finite element software was applied to predict the subgrade settlement of Nanchang-Jingdezhen-Huangshan High-speed Railway.In contrast to the field monitoring,the prediction error was controlled within 10％,showing certain reliability of this method.Furthermore,the method was used to predict composite subgrade settlement of existing multiple parallel Shijiazhuang-Jinan Passenger Dedicated Lines.The result shows that the maximum displacement of subsidence is up to 32 mm,respectively appearing at the shoulder of up and down line,and the overall trend of deformation increases gradually from right to left;the maximum subsidence at the center of left line,the center of subgrade surface and the center of right line is 21,17,16 mm respectively.The predicted value of settlement accords to the specification.
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