發(fā)布時間：2018-05-27 00:44

  本文選題：工后沉降 + 沉降預(yù)測　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：建筑物地基或路基的沉降預(yù)測一直是土木工程界所關(guān)注的熱點(diǎn)問題之一,也是土力學(xué)研究中的重要課題之一。對于目前已有的沉降預(yù)測方法而言,主要有基于本構(gòu)模型的數(shù)值分析方法與基于現(xiàn)場實(shí)測沉降數(shù)據(jù)的數(shù)學(xué)分析法兩大類。而由于基于本構(gòu)模型的數(shù)值分析方法在實(shí)際工程中往往具有地基參數(shù)難以確定、本構(gòu)模型與工程實(shí)際存在一定的差別,且往往還需要進(jìn)行大量復(fù)雜的參數(shù)反演分析計(jì)算等缺點(diǎn),因而該類方法在實(shí)際工程中也往往難以推廣使用；因此,對于具有計(jì)算操作便捷,具有很強(qiáng)的工程實(shí)用性特點(diǎn)的基于實(shí)測沉降數(shù)據(jù)的數(shù)學(xué)分析方法便成為了建筑物地基或路基沉降預(yù)測中使用得最廣泛的方法。目前,基于實(shí)際工程現(xiàn)場實(shí)測沉降數(shù)據(jù)的數(shù)學(xué)分析方法已經(jīng)得到了廣泛而深入的研究,且取得了系列卓有成效的研究成果,但仍存在在預(yù)測過程中未充分考慮實(shí)測沉降數(shù)據(jù)新舊程度等的局限性與不足。因此,本文以沉降預(yù)測的數(shù)學(xué)擬合分析方法為基礎(chǔ),在考慮實(shí)測沉降數(shù)據(jù)新舊程度在預(yù)測過程中的不同有效性的前提下,提出基于實(shí)測數(shù)據(jù)新舊程度的工后沉單項(xiàng)預(yù)測與組合預(yù)測新方法。首先,針對實(shí)測沉降數(shù)據(jù)新舊程度對預(yù)測效果的影響,引入新鮮度函數(shù),對單項(xiàng)預(yù)測模型沉降計(jì)算值與實(shí)測值之間的誤差進(jìn)行修正,建立出單項(xiàng)預(yù)測模型擬合分析的新型誤差目標(biāo)函數(shù),并在此基礎(chǔ)上,提出了基于實(shí)測沉降曲線擬合分析確定單項(xiàng)沉降預(yù)測模型參數(shù)的新方法,進(jìn)而提出了反映實(shí)測沉降數(shù)據(jù)新舊程度影響的單項(xiàng)模型工后沉降預(yù)測新方法。然后,在此基礎(chǔ)上引入組合預(yù)測的思想,并通過研究沉降組合預(yù)測可能取值的變化規(guī)律,引進(jìn)平行修正的思路,建立出利于提高沉降組合預(yù)測精度的組合預(yù)測可能取值區(qū)間的調(diào)整方法,提出了同時考慮實(shí)測沉降數(shù)據(jù)新舊程度和組合預(yù)測可能取值區(qū)間調(diào)整對預(yù)測效果影響的改進(jìn)工后沉降組合預(yù)測新方法。最后,通過工程實(shí)例的計(jì)算與分析,以及與實(shí)測值和其他現(xiàn)有相關(guān)方法的計(jì)算結(jié)果比較,可以驗(yàn)證本文改進(jìn)的工后沉降單項(xiàng)預(yù)測方法與組合預(yù)測方法的可行性和合理性。
[Abstract]:The settlement prediction of building foundation or subgrade has been one of the hot issues in civil engineering field, and it is also one of the important subjects in soil mechanics research. For the existing settlement prediction methods, there are two main categories: the numerical analysis method based on constitutive model and the mathematical analysis method based on the field measured settlement data. Because the numerical analysis method based on constitutive model is difficult to determine the foundation parameters in practical engineering, there are some differences between constitutive model and engineering practice, and a large number of complex parameter inversion analysis and calculation are often needed. Therefore, it is difficult to popularize this kind of method in practical engineering. The mathematical analysis method based on measured settlement data with strong engineering practicability has become the most widely used method in the prediction of building foundation or subgrade settlement. At present, the mathematical analysis method based on the field measured settlement data has been extensively and deeply studied, and a series of fruitful research results have been obtained. However, there are still some limitations and shortcomings in the prediction process, such as the new and old degree of measured settlement data are not fully considered. Therefore, based on the mathematical fitting analysis method of settlement prediction, considering the different validity of the new and old degree of measured settlement data in the prediction process, A new method of single item prediction and combination prediction of post-construction subsidence based on the new and old degree of measured data is proposed. Firstly, aiming at the influence of the new and old degree of the measured settlement data on the prediction effect, the freshness function is introduced to correct the error between the settlement calculation value and the measured value of the single prediction model. A new error objective function for fitting analysis of single prediction model is established. On this basis, a new method for determining the parameters of single prediction model based on the fitting analysis of measured settlement curve is proposed. Furthermore, a new method for predicting post-construction settlement of single model is proposed, which reflects the influence of new and old degree of measured settlement data. Then, on this basis, the idea of combination prediction is introduced, and the thought of parallel correction is introduced by studying the law of variation of the possible values of settlement combination prediction. An adjustment method is established to improve the accuracy of the combined settlement prediction, which is helpful to the adjustment of the range of the possible values of the combined settlement prediction. A new method for prediction of post-construction settlement combination is proposed, which takes into account the influence of the new and old degree of measured settlement data and the possible interval adjustment of combination prediction on the prediction effect. Finally, the feasibility and reasonableness of the improved single prediction method and combination forecasting method of post-construction settlement can be verified by the calculation and analysis of engineering examples and the comparison of the calculated results with the measured values and other existing relevant methods.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU433

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