發(fā)布時間：2018-11-19 20:51

【摘要】：近年來很多地方為了提高區(qū)域的運輸效能，陸續(xù)對原有的道路進行擴建改造。由于新老路基的固結度不同，致使新路基的沉降大于老路沉降，這就出現(xiàn)了差異沉降。差異沉降過大會造成路面結構破壞，嚴重時會導致路基失穩(wěn)。減小路基差異沉降是道路改擴建工程的主要技術難題。本論文結合某一級公路改造工程，采用數(shù)值方法對路基差異沉降的防治措施進行分析，主要內容歸納如下： （1）數(shù)值計算方法在土的固結沉降問題中的應用 采用基于Biot固結理論的有限元分析方法，通過算例與經(jīng)典的Terzaghi固結理論結果進行對比，驗證本文采用的數(shù)值計算方法的可靠性。 （2）路基拓寬差異沉降特性及差異沉降指標 在總結國內外公路改擴建工程實踐的基礎上，分析了路基差異沉降產(chǎn)生的病害和原因。運用分析軟件模擬了路基拓寬工程的差異沉降變形、應力分布、孔隙壓力變化。根據(jù)路面結構層的彎拉強度確定差異沉降控制指標。 （3）一級公路差異沉降防治措施分析 結合安徽蚌埠市蚌固一級公路改造工程的實際拼接加寬方式和地質條件，選取典型的路基拓寬截面，采用數(shù)值方法，分別對拼接拓寬方式、拼接坡率及臺階尺寸、土工格柵設置等方面對拓寬路基沉降變形進行分析，，并對其效果進行分析總結并提出相應的建議。 論文中的若干結論可為類似的課題及工程設計提供參考。
[Abstract]:In recent years, in order to improve the efficiency of regional transportation, many places have carried on the expansion and transformation of the original road. Because the consolidation degree of new and old subgrade is different, the settlement of new subgrade is larger than that of old road. The pavement structure is damaged by the differential settlement, which will lead to the instability of the roadbed. Reducing subgrade differential settlement is the main technical problem of road reconstruction and extension project. In this paper, the prevention and treatment measures of differential settlement of subgrade are analyzed by numerical method combined with a first class highway reconstruction project. The main contents are summarized as follows: (1) the application of numerical method in the settlement of soil consolidation using the finite element analysis method based on Biot consolidation theory is compared with the results of classical Terzaghi consolidation theory. The reliability of the numerical method used in this paper is verified. (2) on the basis of summing up the practice of highway reconstruction and extension project at home and abroad, the characteristics and index of subgrade widening differential settlement are analyzed, and the diseases and causes of subgrade differential settlement are analyzed. The differential settlement deformation, stress distribution and pore pressure change of roadbed widening project are simulated by using analysis software. According to the flexural tensile strength of pavement structure layer, the differential settlement control index is determined. (3) the prevention and treatment measures of differential settlement of first-class highway are analyzed and combined with the actual splicing widening mode and geological conditions of the first class highway reconstruction project in Bengbu City, Anhui Province. The typical roadbed widening section is selected and the numerical method is adopted. The settlement and deformation of widening roadbed are analyzed from the aspects of splicing widening mode, splicing slope ratio and step size, geogrid setting, etc., and the results are analyzed and summarized and corresponding suggestions are put forward. Some conclusions in this paper can provide reference for similar subjects and engineering design.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U418.8;U416.1

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