长距离联络通道分期冻结隧道衬砌结构受力变形规律研究

发布时间：2018-11-20 15:10

【摘要】：目前,地铁联络通道一般线间距为10~13m,运用人工冻结法施工时多采用单侧冻结的模式,且应用技术相对成熟。由于长距离联络通道的特殊性,其所处位置的左、右线隧道间距较远,采用冻结法施工时冻胀对隧道的影响不同于一般长度的联络通道。本文依托武汉机场线盘龙城站~宏图大道站区间联络通道施工工程,考虑水平分期冻结情况,研究长距离联络通道冻结施工过程中主隧道衬砌的受力变形规律,对工程设计和安全施工具有极其重要的意义。首先,开展数值模拟研究。对典型参数及分期冻结情况下冻结壁的平均温度和平均厚度进行计算;对隧道衬砌的受力变形规律进行了分析。此外,考虑冻结壁倾角、分期冻结时间差和两侧冻结壁交接面位置三个因素对冻胀的影响展开研究。其次,开展物理模拟试验研究。通过模化设计对原型进行缩比计算,设计模拟试验系统;考虑分期冻结情况,分析长距离联络通道冻结施工过程中温度场的变化规律,研究隧道衬砌受力变形的发展规律。最后,通过数值模拟与物理模拟试验的结果对比,综合分析冻结施工中土体的温度场及隧道衬砌的受力变形规律,并验证了数值模拟模型的可用性。本文的研究对长距离联络通道冻结工程的设计与施工具有重要的指导意义,为今后此类长距离联络通道冻结施工方法的应用及推广具有重要的意义。
[Abstract]:At present, the distance between the lines of the subway communication channel is 10 ~ 13m, and the method of artificial freezing is mostly used in the construction of one-side freezing, and the application technology is relatively mature. Because of the particularity of the long distance connection channel, the distance between the left and right tunnels is far, so the frost heaving influence on the tunnel is different from that of the normal length contact channel. In this paper, based on the construction project of the connection channel between the Panlong City Station and the Hongtu Avenue Station of Wuhan Airport Line, considering the freezing situation of horizontal stages, the deformation law of the main tunnel lining during the freezing construction of the long distance connection passage is studied. It is of great significance for engineering design and safe construction. Firstly, numerical simulation is carried out. The average temperature and thickness of freezing wall under typical parameters and freezing by stages are calculated, and the deformation law of tunnel lining is analyzed. In addition, the effects of freezing angle, phase freezing time difference and the joint position of two sides freezing wall on frost heave are studied. Secondly, physical simulation experiments are carried out. The simulation test system was designed by using the model design to calculate the shrinkage ratio of the prototype. Considering the freezing by stages, the variation law of temperature field during the freezing construction of the long distance connection passage was analyzed, and the development law of tunnel lining force and deformation was studied. Finally, by comparing the results of numerical simulation and physical simulation test, the temperature field of soil and the deformation of tunnel lining are comprehensively analyzed, and the availability of numerical simulation model is verified. The research in this paper is of great significance to the design and construction of the long distance connection channel freezing engineering, and it is of great significance for the application and popularization of this kind of long distance connection channel freezing construction method in the future.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49;U451

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