考虑地基模量选取弹性模量修正参数的高速铁路复合地基路基沉降预测

Settlement Prediction of High-speed Railway Composite Subgrade via Selection of Elastic Modulus Correction Parameter by Considering Foundation Modulus

高速铁路路基沉降的精准预测对于铁路运行安全具有重要意义。提出一种考虑地基模量选取弹性模量修正参数的复合地基路基沉降预测方法,通过MidasGTS-NX有限元软件数值模拟,应用于昌景黄高速铁路段路基沉降预测,与现场监测进行对比,其预测误差控制在10%以内,表明该方法具有一定的可靠性。应用于多线并行既有石济客专铁路复合地基路基沉降预测,结果表明:最大沉降位移达到32mm,分别出现在上、下行联络线路肩位置处,整体变形趋势由右向左逐渐增大,左线中心、路基面中心、右线中心最大沉降值分别为21、17、16mm,沉降预测值符合规范要求。

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 corection 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 1o%,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.