【摘要】：邊坡的穩(wěn)定性分析問(wèn)題一直都是巖土工程安全中十分重要的研究?jī)?nèi)容。到目前為止，邊坡穩(wěn)定性分析方法主要分為兩類(lèi)：一類(lèi)是基于安全系數(shù)并有著大量工程應(yīng)用實(shí)例的極限平衡法；另一類(lèi)是利用計(jì)算機(jī)強(qiáng)大的計(jì)算能力來(lái)模擬大型邊坡內(nèi)部單元力學(xué)分析的數(shù)值分析法。但是這些方法還存在許多不足之處：極限平衡法對(duì)于現(xiàn)實(shí)中客觀(guān)存在的巖土參數(shù)的隨機(jī)不確定性沒(méi)法考慮在內(nèi)，導(dǎo)致由于忽略這些不確定性，含有相同安全系數(shù)的邊坡卻有著差距很大的邊坡失穩(wěn)概率；數(shù)值分析法由于采用了幾何非線(xiàn)性迭代，導(dǎo)致時(shí)常存在收斂性問(wèn)題，并且對(duì)于邊坡失穩(wěn)的判斷依據(jù)也存在許多爭(zhēng)議。針對(duì)這些傳統(tǒng)方法存在的一些問(wèn)題如因參數(shù)或者模型的不確定性導(dǎo)致的結(jié)果不精確，本文從不確定信息處理方法中尋找出一些可以有效處理這類(lèi)問(wèn)題的方法。本文的主要成果如下： （1）首先回顧了各種經(jīng)典的邊坡穩(wěn)定方法以及幾種常用不確定信息處理，，并從中提煉出比較可靠的邊坡分析的模型框架與對(duì)應(yīng)的符合處理邊坡的不確定理論處理工具，為進(jìn)一步的研究應(yīng)用打下基礎(chǔ)。 （2）針對(duì)傳統(tǒng)的瑞典圓弧法取多個(gè)滑坡面安全系數(shù)最小值存在的不足，在利用隨機(jī)集對(duì)巖土參數(shù)不確定性表示的基礎(chǔ)上，通過(guò)Dempster組合規(guī)則融合多個(gè)滑坡面的安全系數(shù)，得到一個(gè)綜合的更加精確的結(jié)果。 （3）由于傳統(tǒng)方法無(wú)法對(duì)強(qiáng)降雨下的邊坡穩(wěn)定性進(jìn)行定量分析，本文基于不確定理論建立邊坡穩(wěn)定性與降雨時(shí)長(zhǎng)的隨機(jī)函數(shù)關(guān)系，并利用可傳遞信度模型將結(jié)果轉(zhuǎn)化為概率分布，得出一個(gè)新的的分析結(jié)果。 （4）針對(duì)黃河小浪底水庫(kù)典型邊坡工程進(jìn)行實(shí)地取樣，建立室內(nèi)室外研究模型，應(yīng)用不確定信息方法對(duì)其進(jìn)行分析，并用實(shí)驗(yàn)驗(yàn)證了該方法在實(shí)際邊坡工程中應(yīng)用的有效性。
[Abstract]:Slope stability analysis is always an important research content in geotechnical engineering safety. Up to now, slope stability analysis methods are mainly divided into two categories: one is the limit equilibrium method based on safety factor and has a large number of engineering applications; The other is the numerical analysis method to simulate the internal mechanical analysis of large slope by using the powerful computing power of computer. However, these methods still have many shortcomings: the limit equilibrium method can not take into account the random uncertainty of the objective geotechnical parameters in reality, which leads to the neglect of these uncertainties. The slope with the same safety factor has a wide slope instability probability, and the numerical analysis method often has convergence problem because of the geometric nonlinear iteration, and there are many controversies on the judging basis of slope instability. In view of the inaccuracy of some problems existing in these traditional methods, such as the uncertainty of parameters or models, this paper looks for some effective methods to deal with these problems from the uncertain information processing methods. The main achievements of this paper are as follows: (1) at first, various classical slope stability methods and several common uncertain information processing are reviewed. The model framework of slope analysis and the corresponding uncertain theoretical tools for slope treatment are extracted from the model. It lays a foundation for further research and application. (2) in view of the shortcomings of the traditional Swedish circular arc method in taking the minimum value of safety factor of multiple landslide surfaces, the uncertainty of geotechnical parameters is expressed on the basis of random sets. By combining the safety factors of multiple landslide surfaces with the Dempster combination rule, a more accurate result is obtained. (3) the traditional method can not quantitatively analyze the slope stability under heavy rainfall. In this paper, the stochastic function relationship between slope stability and rainfall duration is established based on uncertainty theory, and the result is transformed into probability distribution by using transferable reliability model. A new analysis result is obtained. (4) the typical slope engineering of Xiaolangdi Reservoir of the Yellow River is sampled on the spot, the indoor and outdoor research model is established, and the uncertain information method is used to analyze it. The effectiveness of this method in practical slope engineering is verified by experiments.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU43

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