【作者】 黄燕宏；

【导师】 龚文惠；

【作者基本信息】 华中科技大学 ， 岩土工程， 2006， 硕士

【摘要】 近年来,随着我国南水北调、三峡工程、青藏铁路等大型土木工程的建设,在大量的边坡工程中,水的渗流的问题及其造成的危害已显得越来越突出。而目前的许多工程设计大都忽略了渗流对土和结构物的影响,使得边坡的稳定性存在较大安全隐患。因此,分析渗流对边坡稳定性的影响,具有重要的理论及现实意义。论文介绍了渗流计算的一般原理及方法,根据渗流微分方程和热传导控制方程的相似性,以ANSYS中热分析模块为平台,通过APDL语言开发设计了求解渗流场的程序,得出渗流浸润面的求解方法,从而求出渗透力;阐述了考虑渗流的堤坝边坡的有限元计算方法;采用理想弹塑性模型和摩尔-库仑原理,应用D-P准则,建立了边坡有限元模型,分析了边坡在重力场和渗流场影响下的变形、应力和稳定性;以“神农架木鱼坪-兴山昭君桥旅游公路边坡安全审查和控制”项目为依托,模拟分析了水头、渗透系数和含水量等因素对堤坝边坡稳定性的影响;通过室内抗剪强度试验,分析了含水量对土的内粘聚力和内摩擦角的影响,并从理论上分析了渗流引起的含水量变化对堤坝边坡稳定的影响作用;综合分析了不同渗流条件对堤坝边坡稳定性的影响,提出了在实际工程中对渗流进行简化计算的条件和可忽略渗流影响的条件;最后基于堤坝在渗流作用下的破坏机理,简要介绍了堤坝工程中渗流的防治措施。本文的研究为求解堤坝浸润面提供了一种合理有效的方法,并为选择合适的堤坝填筑土体以及确定合理的警界水位线提供了参考。更多还原

【Abstract】 With the constructing of some big engineering projects such as the South-north Water Transfer, Yangtze Gorges Project, Qinghai-Tiber Railway in these years, the problems and hazards of seepage are becoming more and more notable in a large number of slope engineering. But the influences of the seepage to soils and structures are often ignored in many designs at present, which make many hidden troubles to the stability of slopes. So it is theoretically and actually important to study the influences of the seepage to the stability of slopes.In the thesis, the principle and method about calculating seepage are presented. According to the comparability of the seepage differential equation and thermal differential equation, the program is programmed by APDL language based on thermal model of ANSYS software, the calculating method of seepage field is obtained and then the seepage force is calculated. The FEM of the earth dam slop with seepage is expounded. The FEM model of slop is established according to the perfect elasto-plastic model, Mohr-Coulomb principle and Ducker-Prager yield criterion. The displacement, stress and stability under the influences of the gravity field and seepage field are also analyzed. Based on the project of the Muyuping Shennongjia to Zhaojun Bridge Xingshan travel road slope’s safe auditing and controlling, the influences of hydraulic head, permeability coefficient and moisture content to the stability of the earth dam slops are analyzed by simulating. The effects of moisture content to cohesion and internal friction angle are analyzed through tests, and the influences of moisture to slop stability are also theoretically analyzed .The influences of seepage to slop stability under different conditions are comprehensively analyzed, and the conditions of simple calculation to seepage or ignoring seepage are presented. Lastly, prevention and cure measures in the earth dam project are simply presented basing on its failure mechanism under the action of seepage.A useful and reasonable method of calculating the seepage field is presented, the references of selecting suitable landfill soil and confirming reasonable guard water line are provided by this thesis.更多还原