本文選題：高填方路堤 + 災變機理�。� 參考：《重慶交通大學》2015年碩士論文

【摘要】：隨著山區(qū)交通建設的進一步發(fā)展,高填方路堤無論是在數(shù)量上還是在高度上都將進一步的提高,高填方路堤將成為路基結構的主要形式。長期以來,由于高填方路基本身設計和施工的復雜性,導致路堤災害時有發(fā)生,同時引起的高填方路堤風險問題普遍存在。因此,對高填方路堤災變機理及其風險進行分析研究是非常有必要的。本文以高填方路堤災害為主線,對高填方路堤災變機理及風險評估理論進行了深入研究。具體內容包括:(1)在收集整理現(xiàn)有文獻的基礎上,結合高填方路堤病害調查,總結和分析高填方路堤類型,定義了路堤破壞的四種類型:地基滑坡、路基滑塌、路基沉陷及路基裂縫。其中,地基滑坡主要受控于地基條件;路基滑塌主要受控于填筑體強度;路基沉陷和路基裂縫主要受控于堤體填筑質量和地基條件。(2)在分析巖土體的變形和強度特征的基礎上,對高填方路堤沉降和失穩(wěn)機理做了分析研究,指出沉降是巖土體在附加應力作用下孔隙體積變化的結果;失穩(wěn)是潛在滑裂面的應力屈服所致。各種內外營力的作用導致的高填方路堤應力場、溫度場及干濕場的變化是災害形成的本質原因。(3)在高填方路堤災害類型及影響因素分析基礎上,運用有限元分析軟件分析了地基條件、臨空條件、填筑條件及水的作用對高填方路堤變形與破壞特征的影響。其中地基條件、填筑壓實度和水是高填方路堤災變的主要影響因素;最大沉降位于填方厚度最大處,最大水平位移均位于堤頂外側處且具“回縮”現(xiàn)象;不均勻沉降主要受填方厚度和可壓縮地基土層厚度控制;圓弧形滑動是高填方路堤失穩(wěn)破壞的主要形式。(4)以災害風險理論為研究工具,對高填方路堤災害風險及風險因素進行分析,指出高填方路堤災害風險主要是高填方路堤失穩(wěn)風險,主要風險因素為巖土體力學參數(shù)。結合可靠度理論建立了高填方路堤失穩(wěn)風險評估模型,以失效概率來評價高填方路堤失穩(wěn)風險,同時,在分析和總結國內外文獻資料基礎上,對高填方路堤風險評判標準進行分析,給出了高填方路堤失穩(wěn)風險標準的建議值。
[Abstract]:With the further development of the mountain traffic construction, the high fill embankment will be further improved in both quantity and height, and the high fill embankment will become the main form of the subgrade structure. For a long time, because of the complexity of the design and construction of high embankment, the disaster of embankment occurs frequently, and the risk of high embankment is generally existed at the same time. Therefore, it is necessary to analyze the mechanism and risk of high-fill embankment disaster. In this paper, the disaster mechanism and risk assessment theory of high fill embankment are studied in depth, taking the disaster of high fill embankment as the main line. The concrete contents include: (1) on the basis of collecting and sorting out the existing documents, combining with the investigation of high fill embankment disease, summarizing and analyzing the type of high fill embankment, defining four types of embankment damage: Foundation landslide, subgrade collapse, Subgrade subsidence and subgrade cracks. Among them, the landslide of the foundation is mainly controlled by the condition of the foundation, the collapse of the subgrade is mainly controlled by the strength of the filling body, the settlement of the subgrade and the crack of the subgrade are mainly controlled by the quality of the embankment and the condition of the foundation.) based on the analysis of the deformation and strength characteristics of the rock and soil, The mechanism of settlement and instability of high fill embankment is analyzed. It is pointed out that settlement is the result of pore volume change of rock and soil under additional stress, and instability is caused by stress yield of potential slip surface. The changes of stress field, temperature field and dry and wet field of high fill embankment caused by various internal and external forces are the essential reasons for the formation of disaster. (3) based on the analysis of disaster types and influencing factors of high fill embankment, In this paper, the effects of foundation condition, gob condition, filling condition and water on deformation and failure characteristics of high fill embankment are analyzed by using finite element analysis software. Among them, the foundation condition, the compaction degree of filling and the water are the main influencing factors of the disaster of the high embankment, the maximum settlement is located at the maximum thickness of the embankment, and the maximum horizontal displacement is located at the outside of the top of the embankment and has the phenomenon of "retraction". The uneven settlement is mainly controlled by the thickness of the fill and the thickness of the soil layer of the compressible foundation, and the circular slip is the main form of instability and failure of the embankment with high fill. Based on the analysis of hazard risk and risk factors of high embankment, it is pointed out that the risk of high embankment is mainly the risk of instability of high embankment, and the main risk factor is geophysical parameters. Combined with reliability theory, a risk assessment model for instability of high embankment is established. The failure probability is used to evaluate the risk of instability of high embankment. At the same time, based on the analysis and summary of domestic and foreign literature, The risk evaluation criteria of high embankment are analyzed, and the suggested value of risk criterion for instability of high embankment is given.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.12

【參考文獻】

相關期刊論文 前1條

1 張業(yè)成，張梁;論地質災害風險評價[J];地質災害與環(huán)境保護;1996年03期

相關碩士學位論文 前1條

1 汪麗;邊坡工程風險指標體系的建立與應用[D];成都理工大學;2011年

，

本文編號：1775265