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Stduy of Multiphase Coupled Piping Mechanism and Levee Security Early Warning System

Author: BiMingYu
Tutor: YaoLeiHuaï¼›ZhangBin
School: Chinese Geology University (Beijing)
Course: Geotechnical Engineering
Keywords: Dike Piping Multiphase coupling WebGIS Comsol
CLC: TV871.2
Type: Master's thesis
Year: 2011
Downloads: 124
Quote: 0
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Abstract


The dike project is a colossal key water conservancy project, its security and stability is essential. During the flood season, the levee foundation penetration deformation and failure is the main cause embankment dangerous, piping in which accounted for a large proportion. But because of the randomness and complexity of the piping, piping mechanism of the development of the understanding there is considerable controversy, no generally accepted methods and theory. Further to predict seepage deformation occurs in the form of piping mechanism studies, and specific location, dike emergency reinforcement scientific guidance, have important theoretical and practical significance. In the piping on the basis of theoretical research to establish the safety of embankments early warning system the piping data dynamically updated and disaster forecast, to provide technical support for the flood control decision-making, is of great significance for ensuring the safety of life and property. The main work of this paper include: (1) collected a large number of domestic and foreign of piping related research information, and detailed description of the piping in the formation and development process; qualitative analysis of influencing factors on the levee foundation piping, draw many meaningful conclusions. (2) through the analysis of the the site prototype observation test data of the Yellow River dike piping indoor model test and flood control exercises, summarizes the characteristics of the piping in the formation and development of the four stages and each stage obtained the piping channel within the flow rate, pressure distribution, Piping imports suction size of parameter variation. (3) based on the coupling mechanism of the development of piping, the soil takes into three-phase model of the soil skeleton phase, liquefied fine particle phase and water phase. Piping occurred the development process of seepage erosion coupling mechanism, the establishment of multi-phase mass conservation differential equations, the constitutive equation while introducing seepage erosion and piping multiphase seepage erosion coupled mathematical model based on the the continuous hydrodynamic theory of porous media,. Comsol in large-scale sparse matrix the PARDISO methods of model parameters the system analysis. The model takes into account the coupling effects between water seepage and soil skeleton phase particle erosion, more realistic simulation of the the piping and development of the non-steady-state, highly nonlinear complex process. (4) the use of numerical simulation results platforms based ArcGISServer, initially established a dike safety warning systems and piping information database, Quick View on piping disaster location of queries and data dynamically updated to provide accurate and timely dike flood control information.

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CLC: > Industrial Technology > Hydraulic Engineering > River training works and flood control projects > Flood control projects > Embankment > Dike management and conservation
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