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Lacustrine soft soil physical and mechanical properties and the creep characteristics of

Author: LiuHao
Tutor: LiLiang
School: Central South University
Course: Road and Railway Engineering
Keywords: Soft soil Correlation Secondary consolidation Creep Model Inversion Analysis Principle of least squares Nonlinear curve fitting
CLC: U212.22
Type: Master's thesis
Year: 2011
Downloads: 52
Quote: 0
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Abstract


The size of the settlement after construction related to the line of ride comfort and driving comfort and safety . Soft soil creep caused by workers after the settlement is an important factor , the study of the soft soil engineering properties and creep characteristics important . To a high-speed railway engineering background , and launched a series of pilot studies Yangcheng Lake region of soft clay , and more systematic study of the soft soil engineering properties and creep characteristics on the basis of test results . Obtain the following results : ( 1) based on the principle of least squares , the mathematical statistical analysis as a means to analyze the Yangcheng Lake in soft soil physical indicators , the correlation between the mechanical index and the physical and mechanical indexes derived regression equation between the relevant parameters . ( 2 ) based on one-dimensional compression creep tests , analysis of the impact of soft soil secondary consolidation characteristics factors . The research showed that: the soft soil consolidation coefficient preconsolidation pressure was not significantly related ; coefficient of consolidation and consolidation pressure curve can hyperbola fitting ; increase the loading ratio can be reduced times coefficient of consolidation ; preload can significantly reduce the coefficient of consolidation ; longer the load time interval , the smaller the coefficient of secondary consolidation . (3 ) According to the one-dimensional compression creep test results , the establishment of a secondary consolidation of soft soil creep model ; experimental values ??with the new model to calculate the value of a comparative analysis , and analysis of the overload preload reduce the reasons for consolidation settlement . The results show that : the new model can reflect secondary consolidation of soft soil creep properties , able to predict the development of secondary consolidation settlement over time . (4) Based on the stress state of the one-dimensional generalized Kelvin creep model , the use of the principle of non-linear least squares inversion analysis of three-dimensional stress state generalized Kelvin creep model , its clear physical meaning , a quest new ways of the 3D soft soil creep parameters .

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CLC: > Transportation > Rail transport > Railway Line Project > Line planning, surveying and design > Survey > Geological Geographical Survey
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