【作者】 吕涛；

【导师】 赵明阶；

【作者基本信息】 重庆交通大学 ， 岩土工程， 2011， 硕士

【摘要】 本文采用数值模拟和理论分析相结合的方法,通过建立完全流固耦合的数值分析模型,较系统的研究了岩溶管道对有压圆形水工隧洞周边围岩在开挖、运行及检修等阶段的应力、应变及位移等的影响。本文的主要研究内容如下:(1)通过查阅国内外的参考文献,总结了岩溶区地下水流的运动规律及进展,并总结了岩溶区水工隧洞研究中的问题,提出了本文的研究课题;(2)系统的介绍了岩溶的发育条件及地貌特征,在此基础上对岩溶含水介质进行了划分,并依此将岩溶水划分为三类,然后分别对其特征进行了介绍;从岩溶水的补给、径流、排泄及其对工程的危害等方面对岩溶地下水系统进行了阐述;并比较了中国南北岩溶的差异;(3)从渗流的基本原理出发,在充分分析岩体介质与地下水相互作用的机理基础上,提出了通过渗透系数的变化实现渗流场—应力场完全耦合的分析方法,并从渗透系数与应力、应变和孔隙度之间的关系出发分别建立了对应的渗流应力耦合的数学模型和有限元离散模型;(4)利用Abaqus有限元分析软件,利用渗透系数与体积应变之间的关系编制了用户子程序,以此建立了基于完全流固耦合的岩溶管道对水工隧洞围岩影响的数值分析模型,并对隧洞周围不存在岩溶管道时进行了计算;(5)通过建立的数值分析模型,分别研究了岩溶管道倾角、管道内水压力、管道与隧洞间的距离及管道大小在有压水工隧洞开挖、运行及检修期间对围岩应力、应变及位移的影响,最后得出了一些有价值的结论。更多还原

【Abstract】 This paper adopt the methods of numerical simulation and theory analysis, the numerical analysis model of fluid-solid interaction is established, the influence of the karst pipeline on stress, strain and displacement of the stage with excavation, operation and maintenance of surrounding rock which is around the circular hydraulic tunnels with pressure are studied systematically. The main research contents are as follows:(1) The motion law and development of underground water and the problem of hydraulic tunnel on study in karst area is summarized by consulting references of domestic and foreign, the research subject of this paper is proposed.(2) The development condition and the geographic character of karst is introduced systematically, the karst aquifer medium is divided, and based on that the karst water is divided to three kinds whose characters are introduced respectively; The underground karst water is elaborated systematically with the respects of karst water supply, runoff, discharge and the damage on engineering, then the difference of karst between north and south in China is compared.(3) Based on the basic principle of seepage, the mechanism of interaction between rock medium and underground water is fully analysised, the fully coupling of seepage field and stress field is proposed by the valuation of permeability coefficient, the mathematical model and finite element discretization model of seepage and stress coupling is established respectively by the relationship between permeability coefficient and stress, strain and porosity.(4) User subroutines were programmed by the relationship between permeability coefficient and volume strain, numercial analysis model of the influence of the karst pipeline with fluid-solid interaction on the surround rock of hydraulic tunnel is established by Abaqus finite elements analysis software, when around the tunnel without karst pipeline is calculated.(5) The influence of the pipeline angle、the internal water pressure of pipeline、the distance between pipeline and tunnel and the size of pipeline on the stress, strain and displacement of surround rock under the stage of excavation, operation and maintenance of hydraulic tunnel with pressure is studied by the numercial analysis model, then some valuable conclusions are obtained.更多还原