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Expressway Soft Subgrade Instability Risk Analysis Method

Author: LuoChengCai
Tutor: LiJun
School: Central South University
Course: Road and Railway Engineering
Keywords: Embankment on Soft Ground Risk Analysis Catastrophe progression method Limit equilibrium method Finite Element Method
CLC: U416.12
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 1
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Abstract


With the rapid development of the economy, more and more highway construction in the soft ground, soft ground embankment stability analysis and evaluation also highlights the important position of all the more. Expressway Soft Subgrade stability of many factors and various factors are intrinsically linked. Current engineering community used soft ground embankment stability evaluation method is based on the improved method of the traditional limit equilibrium principle, such as the Study of Sweden, simplified Bishop method on Janbu law, Morgenstern-Price method, these methods are easy to understand, and After the inspection of a large number of engineering practice. However, since conventional limit equilibrium method for solving a number of simplifying assumptions, the results obtained with the actual in some cases may have a large deviation. Influencing factors for soft ground embankment and miscellaneous introduction of risk analysis and evaluation theory, considering the soft ground embankment stability the main influencing factors, combined with engineering practice, and to build a suitable risk assessment model of soft ground embankment stability has important theoretical significance and practical value. Firstly, domestic and international engineering risk analysis and soft ground embankment stability analysis Research inductive analysis, this topic is currently hot and difficult problems described, based on the main contents of the paper and frame structure. The main research content includes the following sections: (1) the thesis elaborated on the basis of the nature of the soft base base and soft ground treatment methods commonly used form of instability and failure of the embankment on soft ground, affecting factors analyzed and summarized, limit equilibrium method and the use of the more common of the finite element method compared; (2) based on the characteristics of the soft ground embankment instability and failure, the paper introduces disaster risk analysis theory to evaluate the soft base of the traditional embankment stability evaluation method - embankment stability, first introduced the basic concepts of disaster risk analysis, the basic process of risk analysis as well as the common evaluation method, the factors affecting the soft base base embankment instability and failure Discrimination based on instability of soft ground embankment is an accumulated by the gradient to the characteristics of the process of mutation, the paper introduced catastrophe progression method for analysis and evaluation. (3) system of elementary catastrophe theory, establish the soft ground embankment stability catastrophe theory based on elementary catastrophe progression evaluation model, Evaluation, constructed embankment on soft clay ground stability risk assessment matrix. (4) soft ground embankment stability catastrophe progression risk assessment model applied to Expressway Soft Subgrade of Shenhai safety evaluation of stability and, respectively, the use of software-based of geotechnical limit equilibrium method Lizheng and finite element FLAC SLOPE mutation level The number of evaluation results of the validation analysis. The analysis shows that it is reasonable and feasible to use the method to evaluate the stability of the soft ground embankment analysis.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade > Embankment
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