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Study on the Defoemation and Structure Adaptability of Subgrade

Author: ZhangXiaoJing
Tutor: QiuYanJun
School: Southwest Jiaotong University
Course: Road and Railway Engineering
Keywords: High-speed rail Ballastless track Finite Element Acceleration Dynamic stress Dynamic displacement
CLC: U213.1
Type: Master's thesis
Year: 2007
Downloads: 364
Quote: 3
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Abstract


With the start of the Beijing-Shanghai high-speed railway , the Wuhan-Guangzhou , Zhengzhou-Xi'an Passenger Dedicated Line , China 's high-speed ballasted track into a new era . The ballastless track the working mechanism for further in-depth study of the mechanical behavior and design methods , our decision to build then Chongqing ballasted track test section of line total length of 12.65km , for the first paragraph into segments laying test section . High-speed ballasted track rail under the basis of the force is very complicated , mainly manifested in two aspects : First, the fatigue strength of the subgrade soil instability ; based deformation under rail fatigue instability . Therefore, the non - ballasted track roadbed deformation control analysis of the core issues . Which in previous studies , the roadbed is still the strength to control the main the subgrade deformation failure to have sufficient knowledge of . In this paper , the Ministry of Railway Technology Research and Development Program 2005K004-(G): then the key technologies of the Comprehensive Experimental Section of Chongqing line ballasted track pilot study - then Chongqing line ballasted track line engineering key technologies Experimental study relying on the use of HKS Company nonlinear finite element software ABAQUS to establish a three-dimensional finite element model of the existing train load model , mainly discussed the different speed of the train load , of roadbed design parameters subgrade vibration acceleration , vertical dynamic displacement , dynamic stress the related deformation mechanical response . Explore the subgrade deformation and structural adaptability . The results show that : the foundation bed surface with its stiffness increases slightly increased vertical acceleration and vertical dynamic displacement with stiffness decreases dynamic stress ; foundation stiffness exists a critical stiffness value of 80MPa when stiffness smaller in the 80MPa time , the dynamic stress and vertical dynamic displacement amplitude of the surface layer of the foundation bed , vertical acceleration was rapid downward trend ; mechanical response trend was a regular with the increase in speed fluctuations . While taking advantage of a permanent deformation prediction model , permanent deformation and differential settlement of subgrade , the results show that , existing embankment structure to better meet the deformation requirements .

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CLC: > Transportation > Rail transport > Railway Line Project > Line constructed > Subgrade
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