本文選題：高填方路堤 + 災(zāi)變機(jī)理�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：隨著山區(qū)交通建設(shè)的進(jìn)一步發(fā)展,高填方路堤無(wú)論是在數(shù)量上還是在高度上都將進(jìn)一步的提高,高填方路堤將成為路基結(jié)構(gòu)的主要形式。長(zhǎng)期以來(lái),由于高填方路基本身設(shè)計(jì)和施工的復(fù)雜性,導(dǎo)致路堤災(zāi)害時(shí)有發(fā)生,同時(shí)引起的高填方路堤風(fēng)險(xiǎn)問(wèn)題普遍存在。因此,對(duì)高填方路堤災(zāi)變機(jī)理及其風(fēng)險(xiǎn)進(jìn)行分析研究是非常有必要的。本文以高填方路堤災(zāi)害為主線,對(duì)高填方路堤災(zāi)變機(jī)理及風(fēng)險(xiǎn)評(píng)估理論進(jìn)行了深入研究。具體內(nèi)容包括:(1)在收集整理現(xiàn)有文獻(xiàn)的基礎(chǔ)上,結(jié)合高填方路堤病害調(diào)查,總結(jié)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(qiáng)度;路基沉陷和路基裂縫主要受控于堤體填筑質(zhì)量和地基條件。(2)在分析巖土體的變形和強(qiáng)度特征的基礎(chǔ)上,對(duì)高填方路堤沉降和失穩(wěn)機(jī)理做了分析研究,指出沉降是巖土體在附加應(yīng)力作用下孔隙體積變化的結(jié)果;失穩(wěn)是潛在滑裂面的應(yīng)力屈服所致。各種內(nèi)外營(yíng)力的作用導(dǎo)致的高填方路堤應(yīng)力場(chǎng)、溫度場(chǎng)及干濕場(chǎng)的變化是災(zāi)害形成的本質(zhì)原因。(3)在高填方路堤災(zāi)害類型及影響因素分析基礎(chǔ)上,運(yùn)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(duì)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(shí)度和水是高填方路堤災(zāi)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(cè)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(dòng)是高填方路堤失穩(wěn)破壞的主要形式。(4)以災(zāi)害風(fēng)險(xiǎn)理論為研究工具,對(duì)高填方路堤災(zāi)害風(fēng)險(xiǎn)及風(fēng)險(xiǎn)因素進(jìn)行分析,指出高填方路堤災(zāi)害風(fēng)險(xiǎn)主要是高填方路堤失穩(wěn)風(fēng)險(xiǎn),主要風(fēng)險(xiǎn)因素為巖土體力學(xué)參數(shù)。結(jié)合可靠度理論建立了高填方路堤失穩(wěn)風(fēng)險(xiǎn)評(píng)估模型,以失效概率來(lái)評(píng)價(jià)高填方路堤失穩(wěn)風(fēng)險(xiǎn),同時(shí),在分析和總結(jié)國(guó)內(nèi)外文獻(xiàn)資料基礎(chǔ)上,對(duì)高填方路堤風(fēng)險(xiǎn)評(píng)判標(biāo)準(zhǔn)進(jìn)行分析,給出了高填方路堤失穩(wěn)風(fēng)險(xiǎn)標(biāo)準(zhǔn)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(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】：2015
【分類號(hào)】：U416.12

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本文編號(hào)：1775265