盾构隧道下穿火车站站房及铁路股道的分析研究

发布时间：2019-03-20 12:33

【摘要】：随着城镇化建设的加速进行，城市人口不断增加，城市轨道交通建设得到了蓬勃的发展，目前，盾构法是城市轨道交通建设的一种最常用的施工方法，截止2013年12月在全国35个大中城市都有应用。在建筑物分布相对密集的城市中心区域采用该方法施工，会对施工范围内的地层产生较大的影响。对采用盾构法施工的区间，当隧道下穿既有城市铁路运营股道和车站站房时，会使既有铁路地表产生沉降和车站站房地基应力发生变化。如果盾构隧道施工对铁路股道和车站站房基础产生过大的扰动，那么就会影响其正常使用，因此，研究盾构隧道施工对既有铁路股道及车站站房基础的影响具有重要的现实意义。本文以南方某城市轨道交通1号线工程（南方某城市衡阳路至火车站区间，隧道下穿既有铁路股道和车站站房基础）为背景，以本工程的详堪地质资料为依据，，采用数值模拟的方法对盾构下穿车站站房基础、铁路股道的地层沉降进行研究分析，主要研究成果如下：首先，通过计算、分析盾构掘进过程对既有铁路股道（在自身条件和采取相应工程措施条件下的）周围地层沉降的影响，本文确定了盾构掘进对铁路路基沉降的横向和纵向影响范围为：纵向影响范围约为65m，横向影响范围约为前方25m，后方28m，股道的最大沉降值达25.9mm，相邻的钢轨沉降差11.13mm。其次，根据工程详堪地质提供的资料，通过数值模拟计算，得出盾构隧道下穿车站站房基础时，站房桩基的沉降变化及盾构隧道管片应力变化特征，站房桩基最大沉降约19.8mm，最大地面沉降值为22.3m(其中影响区范围内的最大桩基沉降差约4.5mm，最大相邻桩基沉降差约2.6mm)；各施工阶段，管片应力相对较小，最大压应力约2.0MPa，最大拉应力约1.0MPa；弯矩、轴力情况受施工先后的影响明显，呈非对称分布，先开挖隧道管片受力明显大于后施工隧道的管片受力。最后，本文根据数值模拟计算的结果，参考国内在建工程实例，在保证加固质量和盾构机掘进参数合理的情况下，对下穿既有铁路股道和车站站房基础的隧道加固技术进行了初步研究，采用地面加固和洞内注浆的方法对土层进行处理，可以使铁路股道、车站站房基础的沉降得到有效控制，满足工程施工的要求，通过相关工程施工措施比选，确定了适合本工程的施工加固措施，确保了施工安全。本文的研究成果对隧道下穿既有建筑的设计施工具有一定的理论和实践意义。
[Abstract]:With the acceleration of urbanization and the increasing of urban population, the construction of urban rail transit has been vigorously developed. At present, shield method is one of the most commonly used construction methods in urban rail transit construction. As of December 2013, it has been used in 35 large and medium-sized cities throughout the country. The application of this method in the urban central area where the buildings are relatively dense will have a great influence on the strata in the construction area. For the section constructed by shield method, when the tunnel passes through the existing urban railway operation unit and the station, the settlement of the existing railway surface and the change of the ground stress of the station building will occur when the tunnel passes through the existing urban railway operation unit and the station. If the construction of shield tunnel causes excessive disturbance to the foundation of railway stock way and station building, it will affect its normal use, so, It is of great practical significance to study the influence of shield tunnel construction on the foundation of existing railway stock way and station building. This paper is based on the background of a southern urban rail transit line 1 project (Hengyang Road to Railway Station, Tunnel under existing Railway Stock Road and Station Foundation), and based on the detailed geological data of this project. The numerical simulation method is used to study and analyze the ground subsidence of the shield through the station building foundation and the railway track. The main research results are as follows: firstly, through the calculation, the ground settlement of the railway track is studied and analyzed. This paper analyzes the influence of shield tunneling process on the ground subsidence around existing railway strands (under their own conditions and under the conditions of taking corresponding engineering measures). In this paper, the transverse and longitudinal influences of shield tunneling on the settlement of railway roadbed are determined as follows: the longitudinal influence range is about 65m, the transverse influence range is about 25m ahead, the rear area is 28m, and the maximum settlement value of the grooves is 25.9 mm. The adjacent rail settlement difference is 11.13 mm. Secondly, according to the data provided by the detailed geology of the engineering and through the numerical simulation calculation, the settlement change of the pile foundation of the shield tunnel and the stress change characteristics of the segment of the shield tunnel are obtained when the foundation of the station building under the shield tunnel passes through the station building foundation. The maximum settlement of the pile foundation is about 19.8mm and the maximum ground settlement value is 22.3 m (in which the maximum settlement difference of the pile foundation in the affected area is about 4.5 mm and the maximum settlement difference of the adjacent pile foundation is about 2.6mm). At each construction stage, the segment stress is relatively small, the maximum compressive stress is about 2.0 MPA, and the maximum tensile stress is about 1.0 MPA; The bending moment and axial force are obviously affected by the construction sequence and are asymmetrically distributed. The stress on the segments of the first excavation tunnel is obviously greater than that of the construction tunnel after the excavation. Finally, according to the results of numerical simulation and reference to the domestic construction projects under construction, under the condition of reasonable reinforcement quality and tunneling parameters of shield machine, this paper makes use of the results of numerical simulation and reference to the engineering examples under construction in China. This paper makes a preliminary study on the strengthening technology of tunnel through existing railway track and station building foundation. The settlement of railway stock road and station building foundation can be effectively controlled by the methods of ground reinforcement and grouting in the tunnel, and the settlement of railway stock track and station building foundation can be effectively controlled by the method of ground reinforcement and grouting in the tunnel. In order to meet the requirements of engineering construction, the construction reinforcement measures suitable for this project are determined through the comparison and selection of construction measures related to the project, and the construction safety is ensured. The research results of this paper have certain theoretical and practical significance for the design and construction of the existing buildings under the tunnel.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43

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