【作者】 王建华；

【导师】 靳晓光；

【作者基本信息】 重庆大学 ， 桥梁与隧道工程， 2005， 硕士

【摘要】 深埋隧道软弱围岩与初期支护的相互作用是地下工程研究的重要课题之一。该课题涉及到围岩的变形、支护结构的反应以及围岩和支护结构的耦合作用等。随着隧道埋深的增加,围岩稳定和支护结构优化设计等问题,尤其是软弱围岩的支护结构优化设计问题显得越来越突出;弄清围岩与初期支护的相互作用是解决这些问题的关键,也是推动隧道向纵深发展和安全使用的保证,迫切需要深入的研究和探索。论文的主要内容和取得的成果如下: (1) 系统论述了深埋软岩的工程地质特征和力学属性,深埋隧道软弱围岩的变形特征及影响因素和支护原则。(2) 在系统分析隧道现场监控量测方法和技术的基础上,根据通渝深埋隧道现场监控量测成果,分析了围岩的变形特征,初期支护的受力特点。(3) 对隧道量测结果,采用回归分析和灰色模型进行了趋势预测,获得了围岩变形趋势和初期支护应力变化趋势,在此基础上对隧道随时间变化的稳定性进行了分析。(4) 在论述初期支护作用机理的基础上,分析了围岩参数变化和支护参数变化对围岩变形、初期支护受力及围岩与初期支护相互作用的影响,并结合工程实例进行了计算分析,为合理进行初期支护设计和施工提供了理论依据。(5) 阐述了有限元模拟地下工程施工过程的特点,结合通渝隧道分析了不同荷载释放率、锚杆支护参数和施工方法对围岩变形、初期支护受力以及初期支护效果的影响,为合理进行初期支护设计和施工提供了参考。更多还原

【Abstract】 The interaction between soft-weak Surrounding Rock and initial support of deep buried tunnels has become one of the most important subjects in underground engineering research. The subject involves the deformation of surrounding rock, the reaction of support, coupled action of surrounding rock and initial support and so on. The increasing depth of tunnel makes the demands of stabilization of surrounding rock and optimization design of initial support especially for soft rock more and more seriously. The key of solving these problems is to make clear of the interaction between surrounding rock and initial support, which will increase the depth of tunnel and ensure the tunnel’s safe employment. So the key needs further study and exploration. Contents and resulting achievement of this paper are as follow: (1) The geologic engineering characteristics and the mechanical attributions of deep buried soft rock were thoroughly unfolded in this paper. The deformation characteristics of soft-weak Surrounding Rock and its influence coefficient and supporting principle of soft-weak Surrounding Rock in deep buried tunnel were also elucidated. (2) On the basis of full analysising the methods and technologies of in situ minitoring for tunnel, the deformation characteristics of surrounding rock and initial support mechanical are analyzed according to monitoring data of Tong-yu deep buried tunnel. (3) On the basis of deformation trend of surrounding rock and stress trend of initial support gained through trend prediction by regression analysis and gray model according to monitoring data of Tong-yu tunnel, the stabilization of the tunnel is analyzed. (4) Using mechanisms of initial support, the deformation of surrounding rock, stress of initial support and interaction between surrounding rock and support are argued under different parameters of surrounding rock and support. And a project is analyzed, that provides right principles for design and construction of initial support. (5) It is presented that the specialties of FEM (Finite Element Method) used to simulate the excavation in underground engineering. In the simulation of Tong-yu tunnel, deformation of surrounding rock, stress of initial support and effect of support are studied under different rates of load releasing, parameters of bolt and construction methods, that provides the reference to design and construction for initial support.更多还原