地铁隧道盾构法施工下穿建筑物沉降分析与控制

发布时间：2018-11-19 15:26

【摘要】：近年来全国各地轨道交通建设如火如荼,地铁隧道盾构法施工亦日趋成熟。由于地铁建设的自身特点决定了地铁隧道线路通常布设在城市既有主要道路下方,且隧道周边紧邻众多既有建构筑物。盾构掘进施工极易引起邻近建筑物不均匀沉降及倾斜,危害极大,轻者引起房屋破损,重者将危及人民生命财产安全。因此对盾构施工下穿建筑物的工况模拟分析及施工参数研究,对完善盾构法施工工艺和重大风险防控具有重要的意义。本文主要依托于南昌轨道交通2号线7标洪~辛盾构区间的工程实例,研究分析了如何控制地铁隧道盾构法施工下穿建筑物的沉降及倾斜问题。主要着眼点在于盾构掘进参数的设计和隧道邻近建筑物预加固措施的设计及施工,并通过实施验证,该工程所采取的措施是有效的。本文首先对隧道邻近建筑物的结构类型、基础形式、与隧道的关系等信息进行了详细的排查梳理。以建筑物结构安全鉴定为基础,运用数值模拟分析的方法对盾构下穿建筑物施工风险进行评估,得出未加固状态下隧道施工所引起的建筑物沉降及倾斜数值,并以此进行风险定级,根据风险级别确定了需要采取预加固措施的建筑物范围。然后,根据需要采取预加固措施的建筑物的结构形式、基础形式、与隧道关系的特点,通过数值模拟盾构下穿建筑物的过程,对比分析盾构掘进过程中建筑物在加固前后两种状态下的沉降与倾斜数据,判断所设计的预加固措施对建筑物沉降控制的效果,以确定每一座建筑物的最佳预加固方案。其次,本文对难度较大的静压注浆加固施工进行了现场试验研究,解决了大角度斜孔深层静压注浆的难题,为预加固方案的实施提供技术保障。再次,文中叙述了在富水砂层盾构掘进施工中,针对穿越不同风险等级的建筑物分别设计了不同的盾构掘进参数,并以监测数据为导向进行动态调整,以达到最佳的沉降控制效果。最后,将施工全过程的监测结果与数值模拟分析的数据进行比较,达到了沉降控制的既定目标,验证了对建筑物的预加固措施以及盾构掘进参数的设计是合理、有效的。
[Abstract]:In recent years, the construction of rail transit is in full swing all over the country, and the shield construction of subway tunnel is also maturing day by day. Due to the characteristics of subway construction, subway tunnel lines are usually located under the main urban roads, and the surrounding of the tunnel is adjacent to many existing structures. Shield tunneling is very easy to cause uneven settlement and inclination of adjacent buildings, which will cause great harm, which will cause damage to buildings and endanger the safety of people's lives and property. Therefore, it is of great significance to simulate and analyze the operating conditions and the construction parameters of the building under shield construction, which is of great significance to the improvement of shield construction technology and the prevention and control of major risks. This paper mainly relies on the engineering example of 7 mark flood and Xin shield section of Nanchang Rail Transit Line 2, and studies and analyzes how to control the settlement and inclination of the building under the shield tunneling construction of subway tunnel. The main focus is on the design of shield tunneling parameters and the design and construction of pre-reinforcement measures for the adjacent buildings in the tunnel. In this paper, the structure type, foundation form and the relationship between the tunnel and the adjacent building are analyzed in detail. On the basis of structural safety assessment of buildings, the risk of construction under shield tunneling is evaluated by numerical simulation analysis method, and the settlement and inclination of buildings caused by tunnel construction in unreinforced condition are obtained. According to the risk level, the scope of buildings that need to take pre-reinforcement measures is determined. Then, according to the structural form, foundation form, and the relationship between the structure and the tunnel, the process of passing through the building under shield is simulated numerically. By comparing and analyzing the settlement and tilt data of buildings in the course of shield tunneling before and after reinforcement, the effect of the designed pre-reinforcement measures on the settlement control of buildings is judged to determine the best pre-reinforcement scheme for each building. Secondly, this paper has carried on the field test research to the difficult static pressure grouting reinforcement construction, solved the difficult problem of the deep static pressure grouting of the large angle inclined hole, and provided the technical guarantee for the implementation of the pre-reinforcement scheme. Thirdly, in the construction of water-rich sand shield tunneling, different shield tunneling parameters are designed for the buildings with different risk levels, and the dynamic adjustment is carried out under the guidance of monitoring data. In order to achieve the best settlement control effect. Finally, by comparing the monitoring results of the whole construction process with the data of numerical simulation analysis, the established goal of settlement control is achieved, and the design of pre-reinforcement measures for buildings and the design of shield tunneling parameters are verified to be reasonable and effective.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43;TU196.2

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