【作者】 付国栋；

【导师】 王瑞骏；

【作者基本信息】 西安理工大学 ， 水工结构工程， 2010， 硕士

【摘要】 随着混凝土面板堆石坝筑坝技术的发展,混凝土面板堆石坝越建越高、工程规模越来越大,已成为现代面板堆石坝发展的基本趋势。在面板堆石坝的施工过程中,往往截流后坝基处理和坝体填筑工程量较大,造成汛期前不能将坝体填筑到拦洪高程,因此采用围堰和大坝坝面过水的度汛方案往往是可供选择的方案之一。对于采用坝面过水度汛方案的面板堆石坝,如何合理而准确地进行汛期及运行期大坝的渗流和应力变形分析,对于此类工程设计与施工具有重要意义。本文首先论述了面板堆石坝施工期导流度汛标准、导流方式及其选择。论述了坝面过水度汛的一般程序,并结合工程实例加以说明。其次,基于渗流场与温度场计算原理的相似性的对比分析,论证了在通用有限元程序ADINA中实现面板堆石坝渗流计算的可能性。基于非线性邓肯-张EB本构模型,通过在ADINA中应用单元生死功能、时间函数、时间步的联合设置来模拟了堆石坝分层填筑、汛期过水及汛后填筑过程。探讨了堆石坝渗流场与应力场相互作用的耦合机理,通过渗透系数与孔隙率之间的函数关系,建立了渗流场与应力场耦合分析的非线性数学模型。最后,基于上述研究成果,结合黄石滩面板堆石坝工程,分析了施工期坝面过水对大坝渗流场及应力场的影响规律及对汛后大坝填筑的应力场的影响规律。同时针对考虑堆石体渗流场与应力场耦合这两种情况,进行了大坝渗流场及应力场的二维有限元分析计算,获得了上述两种情况下大坝渗流场及应力场的分布与变化规律。本文所建立或提出的上述模型及方法,为施工期坝面过水面板堆石坝的渗流场、应力场及其耦合分析的计算方法进行了一些探索,所获得的分析计算成果对类似工程也具有重要的参考和应用价值。更多还原

【Abstract】 With the development of CFRD technology, the height of CFRD is more and more higher, and the size of the project is more and more greater, which has become a basic development trend of modern CFRD. In CFRD construction process, the time is long of dealing with the dam foundation and dam filling, it’s impossible to filling the dam to flood retention elevation before the flood season. So it’s an options can be choised of flood prevention programs with cofferdam and overflow dam. For the use of overflow CFRD to prevention flood,it’s importance to analysis the seepage and stress reasonable and accurate for project designin and construction in flood and working period.In the beginning of this paper, dissert the prevent flood standard、the way of flow-guiding and how to choose in construction period. Discussed the general procedure of flood prevention with overflow dam with the project example. Based on the comparative analysis of calculation principle’s similarity between seepage filed and temperature field, the feasibility of CFRD seepage field analysis with generic software ADINA module is demonstrated. Based on the nonlinear Dengken E-B constitutive material model, Through combination setting of the element birth and death, time function and time step in ADINA were used to simulate construction course of CFRD compaction in layers, overflow in flood period and dam filling after flood period. The paper reach the coupling mechanism between rockfill seepage and stress field, establish nonlinear coupling mathematical model for seepage and stress field coupling analysis through establish function relationship between permeability and porosity. In the end, based on above research production, combined HUANGshitan CFRD.Obtain seepage and stress distribution and diversification rules though 2D finite element analysis calculation in the case of considering their coupling influence or not.The model and method obtained in the paper explore the calculation method of seepage, stress field and coupling analysis of seepage field and stress field. The research results have very important reference and application value to the similar projects.更多还原