【作者】 薛陶；

【导师】 周建春；

【作者基本信息】 华南理工大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 本文以韶赣高速公路白山与回龙山隧道为工程背景，研究了隧道围岩渗流场与应力场耦合的机理及数学模型，通过对围岩参数反分析理论和方法的研究应用，采用遗传算法，结合韶赣高速公路施工过程中的水压力监测数据，对隧址区的围岩渗透系数进行了反分析计算，通过建立有限元分析模型，分别计算了韶赣高速公路优化设计断面以及隧道标准设计断面的受力性能，通过大型有限元分析软件ABAQUS的用户子程序，建立了渗流场与应力场耦合的本构关系子程序，分析了两种断面在双场耦合条件和固结耦合关系下隧道围岩以及衬砌的力学特性，最后通过计算隧道衬砌各断面的安全系数，对优化设计断面与标准设计断面在承受各种工况时的安全性进行了评估分析，通过可靠度理论，利用改进的一次二阶矩法计算了隧道各种设计断面的可靠度，得到了相应的计算分析结果如下：（1）优化设计断面无论在安全性方面还是可靠性方面都优于隧道标准断面形式，尤其在承受水压力荷载下，优化断面将大幅度的提高隧道在不利受力区域的可靠度和安全系数，同时隧道其他部位的可靠度和安全系数也有明显的提高和改善。（2）由渗流场和应力场耦合分析结果可知，在隧道施工过程中，随着应力状态的不断改变，其无论孔隙度、渗透系数、损伤量值都是在不断地变化之中的，本文相关计算结果更加符合实际工程情况。更多还原

【Abstract】 The mechanism and mathematical model of seepage and stress fields coupling, by theback-analysis theory of surrounding rock parameter and applications are researched in thepaper, based on the Baishan and Huilongshan mountain tunnel engineering of GuangdongShaogan Expressway, using the genetic algorithm combining with the water pressuremonitoring data of Shaogan expressway construction, infiltration coefficient of the tunnel siteof the rock by the back analysis is being calculated, the strutural properties of cross sections,considered optimal design Shaogan expressway tunnel section and the standard design tunnelsection, are calculated based on the finite element models and the analysis software ABAQUSuser subroutine, the seepage field and stress field coupled constitutive relation subroutine foranalysis of the mechanical properties of surrounding rock and the lining under seepage andstress fields coupling and consolidation are considered respectively, with taken two crosssections into account, finally all cross section safety factor for the optimum design section andthe standard design one are calculated to assess the safety, by the use of improved first ordersecond moment method in the reliability theory, to calculate the reliability of the tunnelsection of various design and the analysis results obtained are as follows :(1) The safety or reliability for the optimal section design are better than that of standardones, in particular in the case of withstanding water pressure load, the reliability and safetyfactor for optimmal tunnel sections are improved greatly in the worst combination area ofinternal forces, on the other hand, these parameters on other parts of the tunnel are alsoincreased and improved significantly.(2) The coupled analysis results considering the seepage field and stress field shows thatthe porosity, permeability, damage value are constantly changing with the different stress statein the process of tunnel construction, and the calculation results ih the paper are verified bythe practice.更多还原