盾构下穿运营铁路沉降控制技术及应用研究

发布时间：2018-09-11 21:27

【摘要】：由于大中型城市目前的地面交通设施已进入饱和状态,交通系统已经逐渐向地下拓展,尤其是一线城市,地铁交通已经成为人们出行必不可少的交通工具,随之而来的盾构隧道施工也成了地下结构施工的重要方式。盾构施工下穿铁路时,不可避免会带来一定程度的地面、铁路轨道路基沉降,若沉降超出铁路轨道标准允许范围,可能导致地面不均匀沉降及铁路横向纵向的位移,存在安全隐患。因此,在盾构隧道下穿铁路施工时,要重视铁路路基加固措施,并制定有效的施工技术措施,通过对土层和铁路地基实时沉降监测,进而调整和优化施工技术参数,减少盾构工作时隧道周围土层受到的影响,从而满足铁路远近期的路基沉降要求,确保铁路轨道几何状态达标及线路运输安全,是一个值得深入研究的课题。本文以上海轨道交通17号线地铁盾构下穿沪杭铁路工程施工为背景,采用数值模拟三维建模计算研究,用经验公式验证对比,并在整个盾构推进过程中对铁路轨道及路基变形进行现场施工监测。通过数值模拟与实测数据对比,数值模拟与经验公式验证对比分析及盾构下穿施工控制效果,主要取得以下成果:根据理论计算结果,提出盾构穿越铁路路基段施工的具体保护措施,研究适用上海地区特殊土质的各项施工参数。总结铁路路基沉降规律,进而有利于铁路运输企业对施工方实施标准化方案评审,进行施工安全监控。从而满足铁路路基远近期沉降的要求,满足铁路运营的安全目标。为地铁下穿铁路施工提供技术指导和建议,特别是类似上海地区地质结构的工程。
[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.
【学位授予单位】：中国铁道科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43

【参考文献】