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Study on Slope Erosion Mechanism and Protective of Subgrade

Author: LiaoHuaRong
Tutor: YanKeZhen
School: Hunan University
Course: Traffic and Transportation Engineering
Keywords: Slope erosion Critical slope Mutations theory Slope stability Analytichierarchy process (ahp) Fuzzy similar priority
CLC: U417.1
Type: Master's thesis
Year: 2012
Downloads: 133
Quote: 1
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Abstract


With the booming construction of highway in our country accompanied by moreand more slopes (mainly the high slope) produced, coupled with inadequate attentionto the slope protection, consequently, since the1990s, the road slope collapse,landslide due to China’s annual rainfall commonly occurs. The scour damage of theslopes causes huge losses on Highway construction and operation and large amountsof soil erosion, traffic interruption, and construction investment increasing. Therefore,the research on the slope erosion has practical and theoretical value on scourprotection design, soil erosion control and slope failure. In this paper, draw on thebasis of existing research results.On the basis of current research results in this paper,study is mainly focused in the following aspects:(1) using the theories of infiltration, the flow motion wave and oil erosion, theInfiltration and Runoff of slope, the erosivity and erosion of rainfalls are analyzed.The force model of soil particles in water flow of the slope (including bare slopesand vegetation slope) is established. And the calculation formula of the criticalslope gradient is proposed.(2) on the basis of a comprehensive and in-depth analysis of factors influencing slopeerosion of embankment, the subgrade soil slope is chosen as the research object,combined with catastrophe theory and comprehensive evaluation, the evaluationmodel of the slope erosion stability is established, using the advantages of thecatastrophe theory in the multi-objective decision analysis. The quantization ofimportance of each target in the evaluation systems is determined in accordancewith the internal mechanism of the target normalized formula, and thus it reducesthe subjectivity relatively to be more practical for decision-making or evaluationtends.(3) the evaluation index system for slope erosion protection is proposed on the basisof factors analysis of the embankment slope erosion in the second chapter. Usingthe basic principle of analytic hierarchy process (ahp) method, the Decisionevaluation model of slope disaster management program is established based onthe Fuzzy Analogy Preferred Ratio. In this model, we use the analytical hierarchyprocess (ahp) to identify the weights of various influencing factors, then useFuzzy Analogy Preferred Ratio, consisted of the influencing factors of slopeerosion treatment scheme, to format fuzzy similar preferred matrix and finally findout the solution which is the most similar to slope disaster protection scheme. This analysis results provide a scientific basis for decision-making in theimplementation of the slope harness.

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CLC: > Transportation > Road transport > Road works > Roads ancillary structures and along the facilities > Protection works
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