發(fā)布時間：2018-09-11 21:27

【摘要】：由于大中型城市目前的地面交通設施已進入飽和狀態(tài),交通系統已經逐漸向地下拓展,尤其是一線城市,地鐵交通已經成為人們出行必不可少的交通工具,隨之而來的盾構隧道施工也成了地下結構施工的重要方式。盾構施工下穿鐵路時,不可避免會帶來一定程度的地面、鐵路軌道路基沉降,若沉降超出鐵路軌道標準允許范圍,可能導致地面不均勻沉降及鐵路橫向縱向的位移,存在安全隱患。因此,在盾構隧道下穿鐵路施工時,要重視鐵路路基加固措施,并制定有效的施工技術措施,通過對土層和鐵路地基實時沉降監(jiān)測,進而調整和優(yōu)化施工技術參數,減少盾構工作時隧道周圍土層受到的影響,從而滿足鐵路遠近期的路基沉降要求,確保鐵路軌道幾何狀態(tài)達標及線路運輸安全,是一個值得深入研究的課題。本文以上海軌道交通17號線地鐵盾構下穿滬杭鐵路工程施工為背景,采用數值模擬三維建模計算研究,用經驗公式驗證對比,并在整個盾構推進過程中對鐵路軌道及路基變形進行現場施工監(jiān)測。通過數值模擬與實測數據對比,數值模擬與經驗公式驗證對比分析及盾構下穿施工控制效果,主要取得以下成果:根據理論計算結果,提出盾構穿越鐵路路基段施工的具體保護措施,研究適用上海地區(qū)特殊土質的各項施工參數�？偨Y鐵路路基沉降規(guī)律,進而有利于鐵路運輸企業(yè)對施工方實施標準化方案評審,進行施工安全監(jiān)控。從而滿足鐵路路基遠近期沉降的要求,滿足鐵路運營的安全目標。為地鐵下穿鐵路施工提供技術指導和建議,特別是類似上海地區(qū)地質結構的工程。
[Abstract]:As the ground transportation facilities in large and medium-sized cities are now saturated, the transportation system has gradually expanded underground, especially in first-tier cities. Subway traffic has become an essential means of transportation for people to travel. The following shield tunnel construction has become an important way of underground structure construction. When the shield tunneling is going through the railway, it will inevitably bring about a certain degree of subgrade settlement of the railway track. If the settlement exceeds the allowable range of the railway track standard, it may lead to the uneven settlement of the ground and the lateral and longitudinal displacement of the railway. There are hidden dangers to safety. Therefore, in the construction of railway under shield tunnel, attention should be paid to the reinforcement measures of railway subgrade, and effective construction technical measures should be formulated. Through monitoring the real time settlement of soil layer and railway foundation, the construction technical parameters should be adjusted and optimized. To reduce the influence of the soil around the tunnel during shield tunneling, so as to meet the roadbed settlement requirements of the railway in the near future, to ensure that the railway track geometry state standard and line transportation safety, is a subject worthy of further study. In this paper, based on the construction of Shanghai Rail Transit Line 17 subway shield tunneling through Shanghai-Hangzhou Railway, the three-dimensional modeling and calculation of numerical simulation is used, and the comparison is verified by empirical formula. Field construction monitoring of railway track and roadbed deformation is carried out during the whole shield tunneling process. Through the comparison of numerical simulation and measured data, numerical simulation and empirical formula to verify the comparative analysis and shield tunneling construction control effect, the main achievements are as follows: according to the theoretical calculation results, The concrete protection measures of shield tunneling through railway subgrade section are put forward, and the construction parameters suitable for special soil quality in Shanghai area are studied. Summing up the settlement law of railway subgrade, it is helpful for railway transportation enterprises to carry out standardization scheme evaluation and construction safety monitoring. In order to meet the requirements of railway roadbed settlement in the near future, meet the safety objectives of railway operation. This paper provides technical guidance and suggestions for the construction of subway underpass railway, especially for the similar geological structure in Shanghai area.
【學位授予單位】：中國鐵道科學研究院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43

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