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The Analysis of Subgrade Settlement after Construction Considering Rheology in Soft Soil Area

Author: ZhouShanShan
Tutor: LeiHuaYang
School: Tianjin University
Course: Structural Engineering
Keywords: Rheological Creep test Settlement after Soft soil subgrade Finite Element Analysis
CLC: U213.1
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 0
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Abstract


In order to meet the growing demand for passenger and cargo transport , China has set off a frenzy of building a high-speed railway . Ballastless high-speed rail track technology , without ballasted track high-speed rail , the most important technical requirements of the settlement after extremely strict requirements . The current norms for the long-term effects of the composite foundation for the long-term consolidation of the soil , rheological lack of research , these studies for ballastless track subgrade settlement may seem very significant . Wide distribution of the soft land area in China , the rheological properties of soft soil has significant study soft soil rheology has important implications for settlement after . On the basis of the creep test established by the ABAQUS finite element software consolidation settlement model considering rheology roadbed calculated subgrade settlement value , and does not consider the settlement value of the rheological rheological after impact of settlement . Specifically to do the following work : on the basis of the inspection , research rheological academic achievements soft soil consolidation test and creep test , the strain - time curves of soft soil under different stress levels , strain - stress such as systematic relationship curve curve ; analyzed according to the test results of the rheological properties of the Tianjin Binhai New Area silty clay , the non-linearity of the stress-strain relationship ; according to the test results and the time hardening rule rheological constitutive model fitting to determine the model parameters and test parameters ; application of numerical analysis software ABAQUS, the establishment of the basic model considering rheology subgrade settlement , computational analysis of the value of subgrade settlement , and comparison and does not consider the rheological model subsidence values ??obtained rheology for settlement after impact ; 4 . conducted a sensitivity analysis of the model parameters on the basis of the basic model , to study the soil cohesion c, internal friction angle ? elastic modulus E , the creep parameters A , m , n for settlement .

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