本文選題：安全風(fēng)險(xiǎn)評估 + 沉降變形限制　； 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：隨著鐵路網(wǎng)和公路網(wǎng)的不斷延伸,公路與鐵路交叉工程日趨增多。在鐵路與公路立交工程中,由于考慮鐵路線路的重要性、相關(guān)工程施工的難易程度及工程建設(shè)的造價(jià)等因素,較多時候采用的立交形式為公路下穿鐵路方式,但由于現(xiàn)階段并沒有相關(guān)的規(guī)范定量地指出施工期間,由于鐵路鄰近施工而影響鐵路力學(xué)性能的指標(biāo),因此在相關(guān)工程時,難以準(zhǔn)確地體現(xiàn)施工及運(yùn)營是否對鐵路正常運(yùn)營帶來安全隱患。本文以南大干線下穿貴廣、京廣、廣珠存車場走行線三大鐵路線路的立交工程為研究背景,分析了新建公路的建設(shè)及運(yùn)營對既有線鐵路沉降的控制要求,研究了公路下穿既有線鐵路橋梁及既有線路基的過程,探討了擬建公路對既有鐵路橋梁的力學(xué)狀態(tài)及擬建框架橋?qū)﹁F路既有線頂進(jìn)施工過程的力學(xué)狀態(tài)。為今后高速公路下穿既有鐵路工程提供了參考和借鑒。主要的研究工作和研究結(jié)論如下:(1)以南大干線路基段下穿既有線鐵路橋梁為案例,采用三維有限元軟件對施工全過程及公路運(yùn)營階段對鐵路橋梁進(jìn)行力學(xué)狀態(tài)的分析,得出公路以路基下穿鐵路橋的方式是可行的,滿足鐵路正常運(yùn)營安全性與舒適性的要求。(2)以南大干線框架橋方式下穿既有既有鐵路路基段的采用三維有限元軟件對框架橋頂進(jìn)施工全過程及框架橋運(yùn)營階段對鐵路路基進(jìn)行力學(xué)狀態(tài)的分析,得出公路以框架橋的形式頂進(jìn)下穿既有鐵路路基的方式是可行的,滿足鐵路正常運(yùn)營安全性與舒適性的要求。(3)根據(jù)相關(guān)研究數(shù)據(jù),指出以框架橋形式頂進(jìn)既有鐵路路基的施工過程中,沉降位移相對較大,風(fēng)險(xiǎn)源也較大,因此在施工相關(guān)工程中,需做好基坑開挖、列車慢駛等專項(xiàng)措施及施工監(jiān)控。
[Abstract]:With the continuous extension of railway network and highway network, highway and railway crossing projects are increasing day by day. In railway and highway interchange engineering, because of considering the importance of railway line, the degree of difficulty in construction and the cost of engineering construction, the overpass mode is used in many times. However, since there are no relevant specifications at this stage to quantitatively point out the indexes that affect the mechanical properties of the railway during the construction period due to the construction of the railway adjacent to the railway, so in the relevant projects, It is difficult to accurately reflect whether the construction and operation bring safety hidden trouble to the normal operation of railway. Based on the research background of the interchange project of three major railway lines, Gui Guang, Jingguang and Guangzhu, under the Nanda trunk line, the paper analyzes the control requirements of the new highway construction and operation to the settlement of the existing railway. This paper studies the process of underpass existing railway bridge and existing railway roadbed, discusses the mechanical state of the proposed highway to the existing railway bridge and the mechanical state of the proposed frame bridge to the railway existing railway jacking construction process. It provides a reference for the existing railway project under the expressway in the future. The main research work and conclusions are as follows: (1) taking the existing railway bridge under the subgrade section of Nanda trunk line as an example, the mechanical state of the railway bridge during the whole construction process and the highway operation stage is analyzed by using three-dimensional finite element software. It is concluded that it is feasible for the highway to cross the railway bridge under the roadbed. To meet the requirements of normal operation safety and comfort of railway.) the whole process of frame bridge jacking construction and the operation stage of frame bridge under the mode of Nanda trunk line frame bridge passing through the existing railway subgrade section with 3D finite element software are analyzed. Analysis of the mechanical state of railway subgrade, It is concluded that it is feasible for the highway to pass through the existing railway roadbed in the form of frame bridge, and meet the requirements of normal operation safety and comfort of the railway. It is pointed out that the settlement displacement is relatively large and the risk source is large during the construction of the existing railway roadbed by the frame bridge. Therefore, in the construction related projects, special measures such as excavation of foundation pit and slow running of train should be done well and construction monitoring should be done.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U415;U441

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本文編號：1861969