發(fā)布時間：2018-03-14 02:44

  本文選題：改擴建　切入點：不均勻沉降　出處：《石家莊鐵道大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著我國的經(jīng)濟騰飛,高速公路建設的規(guī)模與速度都處在一個相當快的發(fā)展階段,在目前已處于運營階段的的高速公路中,由于設計時對我國近些年飛速發(fā)展的交通狀況估計不足,有相當大比例的高速公路是雙向四車道。隨著交通流量日漸增大,這些根據(jù)當時的預計交通流量所設計的高速公路已經(jīng)明顯無法滿足目前的交通需求,然而在土地資源日益緊張的時代,在保留既有線路的同時,重新選線修筑新的高速公路并不是一個完美的方案,而對既有的高速公路進行加寬、改建、擴建成為了相對更合理的方案:高速公路改擴建所需占地情況相較新建高速公路節(jié)省了大量寶貴的土地資源;在改擴建工程中可以保持部分線路不斷交施工,能夠在維持現(xiàn)階段的交通通過量的同時進行施工。沉降是高速公路地基處理及路基填筑質(zhì)量檢測的重要指標之一,沉降監(jiān)測是最直觀了解高速公路沉降情況的方式。改擴建工程中新老路基間不均勻的差異沉降量的大小直接關系到在工程完工通車后道路的使用是否能夠達到要求,過大的沉降差會導致路面開裂,甚至路基失穩(wěn)塌陷,所以對改擴建工程進行沉降監(jiān)測工作以進行施工控制是非常必要的。本文針對加寬路基中地基固結程度不同產(chǎn)生的不均勻沉降與路基壓縮程度不同產(chǎn)生的不均勻沉降機理分別進行了理論研究,根據(jù)工程情況對本項目改擴建工程新加寬路基的沉降控制標準做了一些有意義的研究。根據(jù)施工中實測所得數(shù)據(jù)與有限元模擬計算所得數(shù)據(jù)進行校核分析,從實際工程中對所選擇的控制標準與控制方法進行驗證。在得到不同工況不同施工時期的沉降數(shù)據(jù)后,可以通過數(shù)學的方法對沉降監(jiān)測中所得到的實測數(shù)據(jù)進行相應的數(shù)據(jù)擬合,推算出未來一個時期內(nèi)路基沉降量的變化趨勢,通過擬合得到的曲線圖預測出后期沉降變化,可以通過預測所得的結果對未來的施工采取相應合理的施工控制措施,以保證加寬路基的施工質(zhì)量。
[Abstract]:With the rapid development of our country's economy, the scale and speed of highway construction are in a rather rapid stage of development. Due to the lack of estimation of the traffic situation in recent years, a large proportion of freeways are two-way four-lane. As the traffic flow increases day by day, These highways, designed on the basis of the projected traffic flow at the time, are clearly unable to meet current traffic needs, but in an era of increasing land scarcity, while retaining existing lines, Rerouting to build new highways is not a perfect plan, but widening and reconstructing existing highways, The expansion has become a relatively more reasonable plan: the need for freeway reconstruction and extension saves a great deal of valuable land resources compared with the newly built expressway, and part of the lines can be maintained for continuous construction in the reconstruction and extension projects. The settlement is one of the important indexes of the expressway foundation treatment and subgrade filling quality detection. Settlement monitoring is the most intuitive way to understand the settlement of expressway. The uneven differential settlement between new and old subgrade in the reconstruction and extension project is directly related to whether the use of the road can meet the requirements after the completion of the project. Excessive settlement differences can lead to pavement cracking and even subgrade instability and collapse. Therefore, it is very necessary to monitor the settlement of the reconstruction and extension project in order to control the construction. This paper aims at the uneven settlement caused by the different consolidation degree of the foundation in the widening roadbed and the uneven settlement caused by the different compression degree of the roadbed. The settlement mechanism is studied in theory. According to the engineering situation, this paper makes some meaningful research on the settlement control standard of the new widening roadbed in the reconstruction and extension project of this project. According to the measured data in construction and the data obtained from the finite element simulation calculation, the settlement control standard of the new widening roadbed is checked and analyzed. The selected control standards and control methods are verified from the actual engineering. After the settlement data of different working conditions and different construction periods are obtained, The measured data obtained in settlement monitoring can be fitted by mathematical method, and the variation trend of subgrade settlement in a period in the future can be calculated, and the later settlement change can be predicted by fitting curves. In order to ensure the construction quality of widening roadbed, the corresponding reasonable construction control measures can be taken for the future construction through the predicted results.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.1

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本文編號：1609257