浅埋软弱围岩中隧道初支结构内各部件支护效能探讨
发布时间：2018-09-04 19:40
【摘要】：隧道初期支护即喷锚支护是在隧道开挖过程中控制隧道围岩变形,调整隧道围岩应力状态,保证隧道掘进施工过程安全进行的重要手段,也是承担围岩压力荷载的重要支护结构。但是,相较于喷锚支护在实际工程中的广泛应用,对于隧道初支结构中各部件之间的相互作用关系,以及这些支护部件在参数上的不同选择对支护效果以及其部件自身的影响仍然认识模糊,在这放面很大程度上仍需要更加深入的研究与探讨。本论文根据喷锚支护现有理论以及岩土工程领域相关理论知识结合我国公路隧道设计规范中给出的相关围岩主要参数以及隧道复合式衬砌设计中的相关参数取值范围为依据,对初支结构进行数值模拟分析。论文的主要内容如下:1)对初支结构中锚杆、喷射混凝土的主要支护理论进行分析研究,对锚杆的锚固力、锚杆锚固力对围岩的作用机理以及喷射混凝土支护对围岩的作用机理进行分析研究,从定性的角度解释初支结构中锚杆、喷射混凝土对隧道围岩的支护效果。2)运用有限元计算软件Madis/GTS通过数值模拟分析从围岩与支护结构的相互作用关系中分析支护结构对围岩的加固机理。3)运用有限元计算软件Madis/GTS对隧道初支结构进行模拟分析,通过对初支结构中个子支护结构不同支护参数的选取,分析初支结构中支护参数变化对围岩支护效果的影响。
[Abstract]:Shotcrete anchor support is an important means to control the deformation of surrounding rock, adjust the stress state of surrounding rock, and ensure the safety of tunneling construction in the early stage of tunnel excavation. It is also an important supporting structure to bear the pressure load of surrounding rock. However, compared with the wide application of shotcrete and anchor support in practical engineering, the interaction between the components in the primary branch structure of tunnel is studied. And the influence of different parameters of these supporting parts on the support effect and the part itself is still unclear. To a large extent, it is still necessary to further study and discuss the caving surface. According to the existing theory of shotcreting and anchor support and the relevant theoretical knowledge in geotechnical engineering field combined with the main surrounding rock parameters given in the design code of highway tunnel in our country and the range of relevant parameters in the design of composite lining of tunnel as the basis of this paper. The numerical simulation analysis of the initial branch structure is carried out. The main contents of this paper are as follows: (1) the main supporting theory of bolt and shotcrete in primary support structure is analyzed and studied, and the anchoring force of bolt is studied. The mechanism of anchor force acting on surrounding rock and the action mechanism of shotcrete support on surrounding rock are analyzed and studied, and the anchors in primary support structure are explained qualitatively. The effect of shotcrete on supporting surrounding rock of tunnel. 2) using finite element calculation software Madis/GTS to analyze the reinforcement mechanism of surrounding rock from the interaction between surrounding rock and supporting structure by numerical simulation. 3) using finite element method. The software Madis/GTS is used to simulate and analyze the initial branch structure of the tunnel. Through the selection of different supporting parameters of sub-support structure in primary support structure, the influence of support parameters in primary support structure on the support effect of surrounding rock is analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.7
本文编号：2223143
[Abstract]:Shotcrete anchor support is an important means to control the deformation of surrounding rock, adjust the stress state of surrounding rock, and ensure the safety of tunneling construction in the early stage of tunnel excavation. It is also an important supporting structure to bear the pressure load of surrounding rock. However, compared with the wide application of shotcrete and anchor support in practical engineering, the interaction between the components in the primary branch structure of tunnel is studied. And the influence of different parameters of these supporting parts on the support effect and the part itself is still unclear. To a large extent, it is still necessary to further study and discuss the caving surface. According to the existing theory of shotcreting and anchor support and the relevant theoretical knowledge in geotechnical engineering field combined with the main surrounding rock parameters given in the design code of highway tunnel in our country and the range of relevant parameters in the design of composite lining of tunnel as the basis of this paper. The numerical simulation analysis of the initial branch structure is carried out. The main contents of this paper are as follows: (1) the main supporting theory of bolt and shotcrete in primary support structure is analyzed and studied, and the anchoring force of bolt is studied. The mechanism of anchor force acting on surrounding rock and the action mechanism of shotcrete support on surrounding rock are analyzed and studied, and the anchors in primary support structure are explained qualitatively. The effect of shotcrete on supporting surrounding rock of tunnel. 2) using finite element calculation software Madis/GTS to analyze the reinforcement mechanism of surrounding rock from the interaction between surrounding rock and supporting structure by numerical simulation. 3) using finite element method. The software Madis/GTS is used to simulate and analyze the initial branch structure of the tunnel. Through the selection of different supporting parameters of sub-support structure in primary support structure, the influence of support parameters in primary support structure on the support effect of surrounding rock is analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.7
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