偏压隧道二次衬砌优化设计研究

发布时间：2019-01-14 15:13

【摘要】：我国大部分地区多为山岭、丘陵地带,随着国家大力发展基础交通设施,在穿山过岭时隧道工程得以广泛应用。国内外对于隧道设计施工的研究越来越多,而对于复杂地质条件的隧道,如偏压隧道,其研究还相对较少。对于隧道偏压,主要以隧道衬砌结构承受不对称荷载作为判别标准,其形成原因包括地形,地质构造,施工的因素。目前对于偏压隧道的设计常常采用工程类比的方法,但各隧道工程地质条件相对复杂,不能完全适用于类似隧道,在设计施工时难免造成人力物力的浪费。本文以鹤大高速回头沟隧道进口处浅埋偏压段为研究对象,通过现场埋设土压力盒获得围岩压力和二衬接触压力的监控数据,分析二次衬砌承担围岩压力的比例。采用荷载结构法,应用MIDAS GTS/NX建立二衬的计算模型,以监测数据获得的二衬承担比例计算二衬压力,分析选取偏压断面的衬砌结构安全性。采用相同的方法,讨论不同横坡角度对二衬结构的内力和变形影响,根据规范的要求,判断其安全性。在此基础上,对二次衬砌厚度进行优化,探讨不同地形坡度,不同衬砌厚度与二次衬砌结构内力和位移的关系,从模拟结果分析二次衬砌的优化厚度。
[Abstract]:Most areas in China are mountains and hilly areas. With the development of basic transportation facilities, tunnel engineering has been widely used in the crossing of mountains. There are more and more researches on tunnel design and construction at home and abroad, but the research on tunnel with complex geological conditions, such as bias tunnel, is relatively less. For the bias of tunnel, the tunnel lining structure is mainly regarded as the criterion of asymmetric load, and the reasons include topography, geological structure and construction factors. At present, the method of engineering analogy is often used in the design of bias pressure tunnel, but the engineering geological conditions of each tunnel are relatively complex, which can not be fully applied to similar tunnels, and it is inevitable to cause waste of manpower and material resources in the design and construction of the tunnel. In this paper, the shallow burying partial pressure section at the entrance of Heda High Speed Huigou Tunnel is taken as the research object, and the monitoring data of surrounding rock pressure and second liner contact pressure are obtained through burying the earth pressure box on the spot, and the proportion of secondary lining bearing surrounding rock pressure is analyzed. The load structure method and MIDAS GTS/NX are used to establish the calculation model of the second liner. The pressure of the second liner is calculated according to the ratio of the two linings obtained from the monitoring data. The safety of the lining structure selected from the bias section is analyzed. The same method is used to discuss the influence of different transverse slope angles on the internal force and deformation of the two-lining structure. The safety of the structure is judged according to the requirements of the code. On this basis, the secondary lining thickness is optimized, and the relationship between the different terrain slope, the different lining thickness and the internal force and displacement of the secondary lining structure is discussed, and the optimized thickness of the secondary lining is analyzed from the simulation results.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.91

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