本文選題：高填方 + 差異沉降　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：隨著我國(guó)中西部區(qū)機(jī)場(chǎng)建設(shè)高速發(fā)展,西南地區(qū)規(guī)劃擬建與在建機(jī)場(chǎng)數(shù)量較多,不同于平原地區(qū),由于西南片區(qū)人口密度較大,且高山峽谷居多,已無(wú)大面積平緩地帶供機(jī)場(chǎng)建設(shè),故出現(xiàn)大量的高填方機(jī)場(chǎng)。而高填方機(jī)場(chǎng)所引起的諸多工程問(wèn)題如差異沉降過(guò)大引起的道路面破裂、斜坡坡度過(guò)大引起填方邊坡的滑裂等,嚴(yán)重影響飛機(jī)的安全起落,甚至直接導(dǎo)致機(jī)場(chǎng)無(wú)法正常使用,故對(duì)于西南片區(qū)高填方機(jī)場(chǎng)差異沉降變形規(guī)律及其主要的影響因素的研究是有必要的。目前國(guó)內(nèi)的研究觀點(diǎn)主要集中在填土的厚度、土的性質(zhì)、上覆荷載等方面。而針對(duì)已發(fā)生較大差異沉降破壞的實(shí)際工程調(diào)查中發(fā)現(xiàn),除了上述幾點(diǎn)因素,隨著原始地基的起伏面變化,其不均勻沉降的破壞程度也在變化,因此,地形條件對(duì)差異沉降的影響研究是有一定的工程意義。本文在整合西南部分高填方機(jī)場(chǎng)勘察資料的基礎(chǔ)上,總結(jié)出存在于西南各片區(qū)的典型地形,即斜坡溝谷地形。以它為研究對(duì)象,進(jìn)行數(shù)值模擬試驗(yàn)及離心模型試驗(yàn),并結(jié)合某高填方機(jī)場(chǎng)凹槽地形實(shí)測(cè)值作為工程實(shí)例進(jìn)一步闡明高填方填筑體在地形起伏面下的沉降特征。本文的主要工作內(nèi)容和成果為:(1)對(duì)西南地區(qū)各高填方機(jī)場(chǎng)的地形地貌進(jìn)行詳細(xì)的介紹,指出地形問(wèn)題在西南地區(qū)工程建設(shè)中的普遍性,總結(jié)典型地形并作為研究對(duì)象。(2)使用FLAC3D對(duì)典型地形進(jìn)行建模分析,并建立對(duì)比模型,研究影響高填方填筑體沉降的地形參數(shù),通過(guò)實(shí)驗(yàn)結(jié)果分析在地形影響下的沉降規(guī)律。(3)在數(shù)值模擬實(shí)驗(yàn)結(jié)論的基礎(chǔ)上進(jìn)行土工離心實(shí)驗(yàn)的方案設(shè)計(jì),并最終通過(guò)土工離心實(shí)驗(yàn)研究了不同地基形狀下高填方機(jī)場(chǎng)填筑體沉降的變化以及差異沉降量的規(guī)律。(4)初步討論包含地形參數(shù)的擬合公式,并與前人的研究成果進(jìn)行對(duì)比,探討其可行性,并提出避免地形對(duì)差異沉降量影響過(guò)大所需的工程措施。
[Abstract]:With the rapid development of airport construction in the central and western regions of China, there are more airports planned and under construction in southwest China, which is different from the plain areas. There is no large area of smooth zone for airport construction, so a large number of high-fill airport. However, many engineering problems caused by high filling airport, such as road surface rupture caused by excessive differential settlement and landslide of filling slope caused by excessive slope gradient, have seriously affected the safe landing and landing of aircraft, and even directly resulted in the airport being unable to operate normally. Therefore, it is necessary to study the law of differential settlement deformation and its main influencing factors of high fill airport in southwest area. At present, the domestic research mainly focuses on the thickness of the fill, the properties of the soil, overburden load and so on. In view of the actual engineering investigation of large differential settlement failure, it is found that, in addition to the above several factors, the failure degree of uneven settlement is also changing with the change of the undulating surface of the original foundation, so, It is of engineering significance to study the influence of topographic conditions on differential settlement. On the basis of integrating the survey data of some high filling airports in southwest China, this paper summarizes the typical terrain in southwest China, that is, the slope, gully and valley topography. Taking it as the research object, the numerical simulation test and centrifugal model test were carried out, and the settlement characteristics of the high fill filling body under the topographic relief surface were further clarified by combining the topographic survey values of a high fill airport groove as an engineering example. The main contents and achievements of this paper are as follows: (1) the topographic features of the high-fill airports in southwest China are introduced in detail, and the universality of topographic problems in the engineering construction in southwest China is pointed out. Summarizing the typical terrain and taking it as the research object. (2) using FLAC3D to model and analyze the typical terrain, and to establish a comparative model to study the terrain parameters that affect the settlement of the high fill. The settlement law under the influence of topography is analyzed by the experimental results. (3) the scheme design of geotechnical centrifuge experiment is carried out on the basis of the numerical simulation results. Finally, through the geotechnical centrifugation experiment, the variation of settlement and the law of differential settlement of high fill airport landfill under different foundation shape are studied. (4) the fitting formula including terrain parameters is discussed preliminarily, and compared with the previous research results. The feasibility of the method is discussed, and the engineering measures to avoid the influence of topography on the differential settlement are put forward.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：V351.1;TU470

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