【作者】 李冬生；

【导师】 张志强；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 目前,我国跨江海水底隧道正蓬勃发展,然而水底隧道的修建与一般山岭隧道有所不同,采用矿山法修建存在一定的技术空白,同时,对水底隧道分区防排水关键技术的研究也很少。因此,展开对矿山法修建的水底隧道施工期间渗流力学特征以及分区防排水关键技术的研究就显得十分急迫。论文采用有限差分软件FLAC3D,基于流-固耦合作用机理,同时结合“厦门-翔安”海底隧道及浏阳河水底隧道,主要对矿山法修建水底隧道施工期间的渗流力学特征及分区防排水关键技术进行研究。研究内容和研究成果如下：(1)综述分析了水压对水底隧道工程的力学效应、渗流场与力学场的耦合计算机理以及流-固耦合分析的等效连续介质数学模型。本文采用等效连续介质模型进行相关的研究。(2)基于流-固耦合机理,对限量排放条件下,二次衬砌背后孔隙水压力进行了研究,得出了排水量与二衬背后孔隙水压力的关系曲线；同时,还对全排条件下,支护结构内力进行了研究,得出了注浆圈的施设对支护结构受力的影响。(3)基于流-固耦合机理,对矿山法修建的采用不同排水边界的水底隧道进行了对比分析,得出了水底隧道施工期间的围岩及支护结构的渗流力学特征。(4)对水底隧道采用分区防排水技术时,支护结构及垫层背后孔隙水压力和围岩内渗流场的分布规律进行了研究；同时,针对水底隧道支护结构背后孔隙水压力及排水段的排水量,分析了过渡段垫层渗透系数对其的影响；最后,对计算尚未收敛时,过渡段初衬背后孔隙水压力进行了分析,得出了在孔隙水压力收敛过程中,特别容易发生水流积聚现象的部位。更多还原

【Abstract】 Currently, underwater tunnels of our country is in flourish development. However, constructions of underwater tunnels is very different from common mountain tunnels. The lack of techniques on construcing underwater tunnels by mining method, and researches on sectional waterproofing and water-drainage tecnique are little both at home and abroad. Therefore, it is urgent for practical constructions to research seepage mechanics characteristics in construction period and sectional waterproofing and water-drainage of underwater tunnels by mining method.With the help of finite difference software FLAC3D, based on the theory on the fluid-mechanical interaction, combined with the Xiamen-Xiang’an subsea tunnel, and Liuyanghe underwater tunnel, the thesis mainly implements research on seepage mechanics characteristics in construction period and sectional waterproofing and water-drainage of underwater tunnels by mining method. The contents and the conclusions are listed as following:1. Introduced mechanical effects of high hydraulic pressure on underwater tunnels, fluid-mechanical interaction principia, equivalent continuum mathematical model of fluid-mechanical interaction. This thesis adopted equivalent continual material to study the relevant contents.2. Based on the fluid-mechanical interaction principia, the thesis researches on pore-water pressure acted on secondary lining on condition of limited drainage, and the results reveal the relationship of discharge of water and average pore-water pressure on secondary lining. Meanwhile, the thesis also make a research on structural internal forces on condition of complete-drainage, and the results reveal the effects of grouting circle on mechanical behavior of secondary lining.3. Based on the fluid-mechanical interaction principia, the thesis also makes a comparative analysis to some underwater tunnel by mining method which employes different drainage boundaries, and the results reveal seepage mechanics characteristics of surrounding rocks and supporting structures in construction period of underwater tunnel by mining method.4. The thesis also makes a research on pore-water pressure acted on the outer boundaries of supporting structure and cushion, and on the distribution regularity of seepage field of surrounding rocks, when the technology of sectional waterproofing and water-drainage is employed in underwater tunnel. Thereafter, the thesis researches on effects of the permeability coefficient of cushion in transitional section on pore-water pressure acted on surpporting structure and cushion, and on the discharge of water in drainage section. Finally, the thesis analyzes the pore-water pressure acted on primary lining when the calculation is not in convergency, and the result tells us the positions in which water accumulates easily on process of convergency.更多还原