软土地区临近运营高铁通道工程安全评估技术研究

发布时间：2018-03-01 07:09

本文关键词： 软土地区运营高铁临近施工安全评估数值仿真　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着高速铁路大规模的建设,已建成和在建的高速铁路不断增加,目前城市规模不断扩大,高速铁路的分割作用日渐显著,由于市政规划不能及时跟进,造成越来越多的市政管线及道路必须穿越已建成及在建的高速铁路桥梁。在软土地区,高速铁路桥梁无砟轨道对沉降及承载力有着严格的要求,为保证高速铁路桥梁的安全,降低工程事故发生的可能性,一般需要对临近高铁或下穿高铁工程的施工防护进行专项设计并进行系统的工程安全评估工作,但此类工程的防护技术及安全评估技术尚无标准可循,因此,有必要对软土地区临近高铁工程防护设计及安全评估技术进行研究,为后续同类工程项目的防护设计及安全评估工作提供技术支持。本课题以天津武清翠亨路下穿京津城际和京沪铁路工程为背景,该工程是我国首例下穿正在运营中的高速铁路立交工程,具有安全风险高、工程技术复杂、施工难度极大等特点。本文针对临近运营高铁通道工程的沉降变形等安全评估评估技术进行了研究,采用经验公式法、三维有限元建模方法,分别进行了临近高铁的降水施工影响分析以及临近高铁基坑的开挖、浇筑过程影响分析,并将安全评估结果与运营高铁线上的桥梁、路基沉降的实测数据进行了对比,以检验评估方法的有效性,确保高铁的运营安全。研究表明,临近高速铁路工程应重点控制地下水位变化、基坑开挖卸载和结构浇注加载问题;采用高压旋喷桩进行全封闭止水设计,可避免基坑抽水或临近铁路降水对既有高铁沉降影响,并有效减小基坑施工和结构加载对临近铁路所产生的变形影响,保证实测高铁变形满足规范要求;建模分析与实测数据的对比证明了所采用评估方法准确、可行,可以有效降低施工安全风险,确保高铁的运营安全,可为今后同类型工程的安全评估提供参考。
[Abstract]:With the large-scale construction of high-speed railway, the number of high-speed railway that has been built and under construction is increasing. At present, the scale of the city is expanding, and the segmentation of high-speed railway is becoming more and more important, because the municipal planning can not follow up in time. As a result, more and more municipal pipelines and roads must pass through the completed and under construction high-speed railway bridges. In soft soil areas, the ballastless track of high-speed railway bridges has strict requirements for settlement and bearing capacity, in order to ensure the safety of high-speed railway bridges, In order to reduce the possibility of engineering accidents, it is generally necessary to carry out special design and systematic engineering safety assessment for the construction protection of projects adjacent to or under high-speed rail. However, there is no standard for the protection technology and safety assessment technology of such projects. Therefore, it is necessary to study the protection design and safety assessment technology of high-speed rail projects near the soft soil area. To provide technical support for the protection design and safety assessment of similar projects. This project is based on the project of Tianjin Wuqing Cuiheng Road crossing between Beijing and Tianjin and the Beijing-Shanghai Railway. This project is the first high speed railway interchange project in operation in our country. It has high safety risk and complex engineering technology. In this paper, the safety assessment techniques such as settlement and deformation of adjacent high-speed railway passage project are studied, and the empirical formula method and 3D finite element modeling method are used. The influence analysis of dewatering construction and the excavation and pouring process of foundation pit are carried out respectively, and the results of safety assessment are compared with the measured data of bridge and roadbed settlement on high-speed railway line. In order to ensure the operation safety of high-speed railway, the research shows that the underground water level should be controlled, the excavation and unloading of foundation pit and the loading of structure should be controlled in order to verify the effectiveness of the evaluation method. Adopting high pressure rotary jet grouting pile to complete sealing design can avoid the influence of foundation pit pumping or dewatering on the settlement of existing high iron, and effectively reduce the influence of foundation pit construction and structure loading on the deformation of adjacent railway. The comparison between the modeling analysis and the measured data proves that the evaluation method is accurate and feasible, which can effectively reduce the construction safety risk and ensure the operation safety of the high-speed railway. It can be used as a reference for the safety assessment of similar projects in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U447;U415

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