本文選題：灰色預測　切入點：軟土地基　出處：《中國地質(zhì)大學（北京）》2014年碩士論文　論文類型：學位論文

【摘要】：高速公路如何規(guī)避沉降問題一直是工程質(zhì)量主要控制問題，而軟土路基則是理論研究的重點。濱海道路對沉降要求高，軟土路基沉降計算和預測是道路建設工程中急需解決的重要問題。本文以天津濱海區(qū)京津高速公路工程為依托，根據(jù)實際沉降資料，分析高速公路相關監(jiān)測與地質(zhì)資料，歸納分析影響沉降的主要因素和發(fā)展變化規(guī)律，為軟土地基處理與公路施工提供理論研究基礎，同時采用灰色模型來分析及預測軟土地基沉降量。本文的主要研究成果如下： 1.本論文依據(jù)實際測得的數(shù)據(jù)，對軟基變形的特點進行了討論。填土路基中的軟基變形隸屬于平面應變的范疇，當前建立在一維固結(jié)理論基礎上的沉降計算方法不能有效預測軟基變形的問題。軟土的塑流現(xiàn)象是造成軟基變形的重要影響因素。 2.填土的速度是造成軟弱地基變形現(xiàn)象另一重要的影響因素。合理有效地填土速度是保證高填方軟基路堤安全施工的重要控制點，，可以直接影響路堤的穩(wěn)定性、地基沉降的大小及其后續(xù)的發(fā)展方向。不合理的填土速度不但會增加工程完工后的沉降現(xiàn)象，還拖延工程后續(xù)施工步驟，進而拖延整個施工工程的質(zhì)量與速度。 3.已有的規(guī)范不能有效且準確的預測軟基沉降的相關數(shù)據(jù)，目前諸如指數(shù)曲線法、對數(shù)曲線法等傳統(tǒng)方法對最終沉降的估算僅僅是建立在少量沉降數(shù)據(jù)的基礎上的，其準確度不高，存在較大的誤差。本論文使用的灰色預測法能夠有效利用現(xiàn)有的所有沉降數(shù)據(jù)，具備較高的準確度，預測結(jié)構可信度更高。 4.本論文運用灰色預測模型較為準確的估算了軟土地基的最終沉降量。利用該模型進行預測的首要條件是原始數(shù)據(jù)必須是等時（空）距的，我們?yōu)榱说玫竭@類型的原始數(shù)據(jù)，運用三次B樣條函數(shù)對實際測得的沉降數(shù)據(jù)進行了插值，并運用插值數(shù)據(jù)進行沉降預測，預測結(jié)果符合預期，與實測值誤差不超過10%。實踐證明，灰色預測方法可行且有效。
[Abstract]:How to avoid the settlement of expressway has always been the main problem of engineering quality control, and the soft soil subgrade is the focus of theoretical research. The calculation and prediction of subgrade settlement in soft soil is an important problem in road construction engineering. Based on the Beijing-Tianjin Expressway Project in Tianjin Binhai area, based on the actual settlement data, the paper analyzes the relevant monitoring and geological data of expressway. The main factors affecting settlement and the law of development and change are summarized and analyzed to provide a theoretical basis for soft foundation treatment and highway construction. Meanwhile, grey model is used to analyze and predict the settlement of soft soil foundation. The main results of this paper are as follows:. 1. Based on the measured data, the characteristics of soft foundation deformation are discussed in this paper. The deformation of soft foundation in fill subgrade belongs to the range of plane strain. The settlement calculation method based on one-dimensional consolidation theory can not effectively predict the deformation of soft foundation. The plastic flow phenomenon of soft soil is an important factor that causes the deformation of soft foundation. 2. The velocity of fill is another important influence factor to the deformation of soft foundation. Reasonable and effective filling speed is an important control point to ensure the safety construction of high fill embankment, which can directly affect the stability of embankment. Unreasonable filling speed will not only increase the settlement phenomenon after the completion of the project, but also delay the subsequent construction steps of the project, and then delay the quality and speed of the whole construction project. 3. The existing codes can not effectively and accurately predict the relevant data of soft foundation settlement. At present, traditional methods such as exponential curve method, logarithmic curve method and other traditional methods for estimating the final settlement are only based on a small amount of settlement data. The grey prediction method used in this paper can use all the existing settlement data effectively and has higher accuracy and higher reliability of prediction structure. 4. In this paper, the final settlement of soft soil foundation is estimated accurately by using the grey prediction model. The primary condition of prediction by this model is that the original data must be isochronous (spatial) distance, in order to obtain this kind of original data, The cubic B-spline function is used to interpolate the actual settlement data, and the interpolation data is used to predict the settlement. The predicted results are in line with the expectation, and the error from the measured values is not more than 10. The practice shows that the grey prediction method is feasible and effective.
【學位授予單位】：中國地質(zhì)大學（北京）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1

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相關博士學位論文 前1條

1 楊靜;高粘粒含量吹填土加固過程中結(jié)構強度的模擬試驗研究[D];吉林大學;2009年

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