【摘要】：國(guó)民經(jīng)濟(jì)的不斷增長(zhǎng)刺激著交通運(yùn)輸?shù)难杆侔l(fā)展,也為基礎(chǔ)建設(shè)提供了良好的契機(jī),在眾多工程地質(zhì)災(zāi)害中,邊坡的失穩(wěn)破壞占據(jù)著相當(dāng)大的比例,嚴(yán)重威脅著人民的生命財(cái)產(chǎn)安全。 目前,有效的邊坡穩(wěn)定性評(píng)價(jià)標(biāo)準(zhǔn)都是建立在極限平衡法的基礎(chǔ)之上,為了對(duì)邊坡的穩(wěn)定狀態(tài)做出準(zhǔn)確的評(píng)判,需要對(duì)邊坡的安全系數(shù)做精確的計(jì)算,結(jié)論雖然可靠,但操作較為復(fù)雜,而且邊坡的破壞往往具有瞬時(shí)性,這就要求對(duì)邊坡穩(wěn)定性的判斷不僅要準(zhǔn)確還要及時(shí)�；诖�,本文的目的就在于尋找一種快速的評(píng)價(jià)方法能對(duì)邊坡的穩(wěn)定狀態(tài)做出準(zhǔn)確的評(píng)判。 研究發(fā)現(xiàn),影響邊坡穩(wěn)定性的因素很多,而且現(xiàn)實(shí)中的邊坡由于其特定的環(huán)境及其性質(zhì)都存在很大的差別,因此,要想建立一套完善的具有普適性的評(píng)價(jià)標(biāo)準(zhǔn)是十分困難的,但同時(shí)邊坡又可按照一定的原則進(jìn)行分類,同一類型的邊坡在一定范圍內(nèi)具有相同的性質(zhì)。邊坡發(fā)生破壞的過程,實(shí)際上是邊坡變形積累的過程,當(dāng)變形達(dá)到一定程度后,邊坡就會(huì)發(fā)生失穩(wěn)破壞,變形和破壞之間的內(nèi)在聯(lián)系就為邊坡的穩(wěn)定性評(píng)價(jià)提供了一個(gè)新的方向。 本文選擇了簡(jiǎn)單的均質(zhì)土邊坡作為研究對(duì)象,在總結(jié)分析邊坡破壞特點(diǎn)及模式的基礎(chǔ)上,根據(jù)要研究的對(duì)象完成了建模工作,用強(qiáng)度折減法原理,分析了在不同坡高及坡比條件下邊坡的最大位移以及相應(yīng)的安全系數(shù),并得到了邊坡的塑性區(qū)云圖,其次,研究邊坡的動(dòng)態(tài)監(jiān)測(cè),針對(duì)邊坡變形產(chǎn)生滑移面以及最大位移,設(shè)置動(dòng)態(tài)監(jiān)測(cè)點(diǎn)用來實(shí)時(shí)監(jiān)測(cè)邊坡的變形情況,為分析邊坡穩(wěn)定性標(biāo)準(zhǔn)提供準(zhǔn)確的位置。最后,本文采用了突變理論里面的尖點(diǎn)突變模型對(duì)邊坡變形數(shù)據(jù)和穩(wěn)定性系數(shù)之間的關(guān)系做了分析研究。 本文的重點(diǎn)在于分析和建立邊坡變形數(shù)據(jù)和穩(wěn)定性之間的聯(lián)系,采用ansys有限元軟件分析不同坡高、坡比條件下邊坡的變形破壞特征,然后對(duì)所得到的變形數(shù)據(jù)做出總體分析研究,尋找能評(píng)判邊坡穩(wěn)定性的指標(biāo)。 本文取得的研究成果有利于進(jìn)一步完善邊坡穩(wěn)定性評(píng)判方法,并對(duì)類似的工程提供一定的參考。
[Abstract]:The continuous growth of the national economy stimulates the rapid development of transportation and provides a good opportunity for infrastructure construction. In many engineering geological disasters, the slope failure occupies a large proportion. It is a serious threat to the safety of people's lives and property. At present, the effective evaluation criteria of slope stability are all based on the limit equilibrium method. In order to make an accurate evaluation of the slope stability, it is necessary to make an accurate calculation of the slope safety factor, although the conclusion is reliable, However, the operation is more complicated, and the slope failure is always instantaneous, which requires not only accurate but also timely determination of slope stability. Based on this, the purpose of this paper is to find a rapid evaluation method to evaluate the stability of slope accurately. It is found that there are many factors that affect slope stability, and the actual slope has great differences because of its specific environment and properties. Therefore, it is very difficult to establish a set of perfect universal evaluation criteria. But at the same time, the slope can be classified according to certain principles, the same type of slope has the same property in a certain range. The process of slope failure is actually the process of slope deformation accumulation. When the deformation reaches a certain degree, the slope will lose its stability. The relationship between deformation and failure provides a new direction for slope stability evaluation. In this paper, a simple homogeneous soil slope is chosen as the research object. On the basis of summing up and analyzing the characteristics and modes of slope failure, the modeling work is completed according to the object to be studied, and the principle of strength reduction is used. The maximum displacement and the corresponding safety factor of the slope under different slope height and slope ratio are analyzed, and the cloud map of the plastic zone of the slope is obtained. Secondly, the dynamic monitoring of the slope is studied, and the slip surface and the maximum displacement are obtained according to the deformation of the slope. The dynamic monitoring points are used to monitor the deformation of the slope in real time, which provides an accurate position for the analysis of slope stability standards. Finally, the relationship between slope deformation data and stability coefficient is analyzed by using the cusp catastrophe model in catastrophe theory. The emphasis of this paper is to analyze and establish the relationship between slope deformation data and stability. The deformation and failure characteristics of slope under different slope height and slope ratio are analyzed by ansys finite element software. Then the deformation data are analyzed and studied to find the index to evaluate the slope stability. The research results obtained in this paper are helpful to further improve the evaluation method of slope stability and provide some reference for similar projects.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.14

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