地基起伏面对山区机场差异沉降影响研究

发布时间：2018-07-06 13:34

本文选题：高填方 + 差异沉降　；参考：《成都理工大学》2017年硕士论文

【摘要】：随着我国中西部区机场建设高速发展,西南地区规划拟建与在建机场数量较多,不同于平原地区,由于西南片区人口密度较大,且高山峡谷居多,已无大面积平缓地带供机场建设,故出现大量的高填方机场。而高填方机场所引起的诸多工程问题如差异沉降过大引起的道路面破裂、斜坡坡度过大引起填方边坡的滑裂等,严重影响飞机的安全起落,甚至直接导致机场无法正常使用,故对于西南片区高填方机场差异沉降变形规律及其主要的影响因素的研究是有必要的。目前国内的研究观点主要集中在填土的厚度、土的性质、上覆荷载等方面。而针对已发生较大差异沉降破坏的实际工程调查中发现,除了上述几点因素,随着原始地基的起伏面变化,其不均匀沉降的破坏程度也在变化,因此,地形条件对差异沉降的影响研究是有一定的工程意义。本文在整合西南部分高填方机场勘察资料的基础上,总结出存在于西南各片区的典型地形,即斜坡沟谷地形。以它为研究对象,进行数值模拟试验及离心模型试验,并结合某高填方机场凹槽地形实测值作为工程实例进一步阐明高填方填筑体在地形起伏面下的沉降特征。本文的主要工作内容和成果为:(1)对西南地区各高填方机场的地形地貌进行详细的介绍,指出地形问题在西南地区工程建设中的普遍性,总结典型地形并作为研究对象。(2)使用FLAC3D对典型地形进行建模分析,并建立对比模型,研究影响高填方填筑体沉降的地形参数,通过实验结果分析在地形影响下的沉降规律。(3)在数值模拟实验结论的基础上进行土工离心实验的方案设计,并最终通过土工离心实验研究了不同地基形状下高填方机场填筑体沉降的变化以及差异沉降量的规律。(4)初步讨论包含地形参数的拟合公式,并与前人的研究成果进行对比,探讨其可行性,并提出避免地形对差异沉降量影响过大所需的工程措施。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：V351.1;TU470

【参考文献】