Analysis Of Stability And Prediction Of Dynamic Permanent Deformation On High Emembankment Of Bazhun Heavy-haul Railway

According to trends of the world’s railroad transportation technology, large axleloads and high speed railway freights have become the inevitable trend of nationalrailway transport. However, with the increase of train axle loads, problems of tracksubgrade become more and more prominent. One of the most important and seriousdiseases of roadbed is the subgrade’s settlement and deformation, which is so criticalthat affects the safety of cargo directly. Therefore, this thesis carrying out analysis ofstability and prediction of permanent settlement on high emembankment has importanttheoretical and engineering significance.This paper mainly relies on the project of the integration technology of roadbedstability evaluation and disease controlfor Shenhua Bazhun heavy-haul railway, and onerepresentative section of the high embankment foundation was selected to study. Takingour country’s C80-truck as the representative load, slope stability of the highembankment subgrade and related influencing factors were firstly analyzed briefly,andthen analysis of dynamic response of the high road embankment under heavy haul trainloads was focused on. Based on the principle of the subgrade’s permanentdeformation under long term cyclic loads, the dynamic deformation of the subgradewas predicted. In this paper, finite element modeling was carried out mainly based onthe finite analysis, and the sleeper-ballast-subgrade-site system was taken as theresearch object, then the stability and dynamic analysis model was established. Theresults could provide important basis for the construction quality, construction cost,long-term safe work and the future maintenance cost of the railroads. etc, which hascertain practical value and academic value. The main research content is as thefollowings:(1) Build a three-dimensional finite element model of the high embankmentsubgrade and analyzing the stability of the subgrade slope of, and then analyze itsstability and related influencing factors based on the soil strength theory.(2) Establish a three-dimensional dynamic finite element model of the highembankment under large vehicle dynamic load to analyze the dynamic response of thesubgrade. For the subgrade under vibration load, the dynamic stress showed greatinfluence on the roadbed’s deformation, so the analysis of of the subgrade dynamicstress under train load was taken as the emphasis. At the same time, acceleration,displacement response, dynamic stress and acceleration spectrum of the roadbed werealso analysed, and results showed vibration of the roadbed under train dynamic loadas a low frequency vibration.(3) Based on the analysis of the dynamic response of the subgrade under heavy haul train loads, the dynamic stress ratio was calculated out, and then with the classicalprediction model of permanent deformation, the dynamic permanently deformation ofthe high embankment under large train load was forecasted.