小净距隧道支护设计与施工控制研究

发布时间：2018-01-21 19:15

本文关键词： 小净距隧道设计计算复合式衬砌施工控制　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：当前,对于小净距隧道围岩压力计算理论的研究尚不多见,且很少考虑隧道施工过程的影响。本文以中开平高速大常山隧道工程为依托,对同一围岩条件,不同净距下,隧道开挖进行分析,提出小净距隧道的划分方法,并严格按照大常山隧道的工程地质条件、现行公路隧道设计规范和设计任务书的要求,依据新奥法理论,进行隧道支护参数的设计计算工作。首先对围岩压力进行计算,得出该工程地质条件下,各级围岩压力数值。其次在衬砌结构方面,洞身段主要采用复合式衬砌;初次支护采用弹塑性理论(地层-结构法),进行锚喷支护的设计与计算。充分发挥和调动围岩的自承能力,从而以最低的支护要求使围岩达到新的二次平衡状态。二次衬砌运用有限元软件进行结构内力分析,较为直观的得到二次衬砌在各个围岩条件下的变形、剪力、轴力及弯矩的分布状态。根据分析结果进行配筋和验算,利用安全系数对其进行受力分析,从受力角度确定其安全性。并对隧道支护参数设计值进行调整优化,使其更合理。由于地质条件的不确定性和施工的复杂性,隧道工程施工过程的控制就显得尤为重要,本文主要从施工工法着手,对隧道施工进行初步的施工组织设计。
[Abstract]:At present, there are few researches on the calculation theory of surrounding rock pressure of small clear distance tunnel, and the influence of tunnel construction process is seldom considered. This paper is based on the medium-Kaiping high speed and large Changshan tunnel project, for the same surrounding rock condition. Under different net distance, the tunnel excavation is analyzed, and the division method of small clear distance tunnel is put forward, and according to the engineering geological conditions of Dachangshan tunnel, the design code and design specification of highway tunnel are strictly followed. According to the theory of New Austrian method, the design and calculation of tunnel support parameters are carried out. Firstly, the pressure of surrounding rock is calculated, and the value of pressure of surrounding rock at all levels under the engineering geological condition is obtained. Secondly, the value of surrounding rock pressure is obtained in the aspect of lining structure. The main body section of the hole is compound lining; Elastic-plastic theory is used to design and calculate the bolting and shotcreting support in the first time, and the self-supporting ability of surrounding rock is brought into full play. In order to achieve a new secondary equilibrium state of surrounding rock with the lowest support requirement, the secondary lining is analyzed by finite element software, and the deformation and shear force of secondary lining under various surrounding rock conditions are obtained intuitively. The distribution of axial force and bending moment. According to the results of the analysis, the reinforcement and check calculation are carried out, and the safety factor is used to analyze the force, and the safety is determined from the point of stress. The design value of the tunnel support parameters is adjusted and optimized. Because of the uncertainty of geological conditions and the complexity of construction, it is particularly important to control the construction process of tunnel engineering. Carry on the preliminary construction organization design to the tunnel construction.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.7

【相似文献】