大埋深盾构隧道围岩压力作用机理与新型管片结构体系研究

大埋深盾构隧道是我国未来隧道工程发展的重要方向，将在我国城市深排水隧道、城际铁路隧道、煤矿井巷、长距离调水工程等领域大量出现。有鉴于此，本项申请针对大埋深盾构隧道穿越复杂岩层所面临的围岩压力计算及支护措施与衬砌结构选择等难题，采用资料调研、理论分析、数值仿真、室内试验、模型试验、足尺试验、现场试验相结合的方法，探明大埋深盾构隧道管片衬砌结构-围岩的相互作用关系，提出形变压力的计算方法；探明大埋深盾构隧道各支护措施的支护特性，形成围岩形变压力的控制对策；探明大埋深盾构隧道联合支护结构体系的受力性能，提出不同支护措施下管片结构的安全性控制标准；研发可用于大埋深软弱破碎岩层的高韧性管片衬砌结构；提出综合考虑围岩变形能释放率、支护结构可控变形能力的支护结构效能评价方法与指标，并最终建立与完善大埋深盾构隧道的管片衬砌结构体系与分析方法，为大埋深盾构隧道的结构设计与安全性评价提供理论依据和技术支撑。

Deep buried shield tunnel is an important direction for the future development of tunnel engineering, which will be subsequently and vastly applied in certain construction fields such as deep drainage tunnels, intercity railway tunnels, coal-mine roadways, and long-distance water conveyance projects. In view of this, this research will focus on the challenges such as the calculation of surrounding rock pressure, supporting measures and the lining structure selection and parameter optimized design. Besides, method is adopted in the research combined with theoretical analysis, numerical simulation, laboratory tests, model tests and full-scale tests in order to verify the interactive relationship between lining structure and surrounding rock of shield tunnels with large cover depth, and propose the calculation method for deformation pressure of surrounding rocks. Then the support characteristics of the support measures in large cover depth shield tunnel can be acknowledged, and the measures for controlling the deformation pressure of surrounding rock can be recommended. Moreover, the mechanical behaviors of the combined support structure system of segmental lining and different support measures for deep buried shield tunnels can be investigated, and the safety control criterion of segmental lining structure is expected to be put forward under different support measures. In addition, the new-type segmental lining structure with high toughness can be developed against the soft rock or highly weathered rock. Furthermore, the evaluation methodology and target for support structure efficiency is raised in overall consideration of releasing rate for rock deformation energy and controllable deform-ability for support structure, and finally segment lining structure system and analytical method is established and completed in deep buried shield tunnels. Consequently, the calculation of deformation pressure can be summarized and then the corresponding control countermeasures will be recommended in order to provide theoretical foundation and technical support for lining structure design and safety evaluation of deep buried shield tunnels.