【作者】 王越；

【导师】 刘东海；

【作者基本信息】 天津大学 ， 水利工程， 2013， 硕士

【摘要】 高土石坝施工期坝体结构性态（如坝体应力变形、不均匀沉降、裂缝和拱效应等）直接关系到大坝将来的运行安全。目前在对土石坝坝体结构性态的相关研究中，往往采用假设土石坝同一分区中坝料性态同质，以及假设各分区坝体均匀上升等简化，而忽略了实际施工质量下坝料特性在空间上的差异性，以及实际动态的施工进程（进度形象面貌）对土石坝施工期坝体结构性态的影响。本文将在国内外现有研究基础上，结合课题组在高土石坝施工质量实时监控方面已取得的相关成果，考虑实际施工质量及大坝填筑过程，深入开展数字化施工下高土石坝施工期结构性态的有限元精细分析及其应用研究，可为高土石坝安全分析提供一条新的途径。本文具体的研究内容及成果如下：（1）介绍了高土石坝非线性有限元分析的原理和方法，详细阐述了反映土体非线性应力应变关系的邓肯-张E B本构关系模型，并实现了在大型通用有限元软件ADINA中的高土石坝施工期有限元建模。（2）介绍了数字化施工下土石坝碾压参数（碾压遍数、碾压速度、压实厚度和激振力）、含水率以及级配的获取方法，建立了坝料压实密度与碾压参数、含水率及级配的多元回归模型。并在此基础上，进一步建立了坝料密度、含水率、级配与邓肯-张E B模型参数（c、、k、n、R f、k b、 m）的多元回归模型，用以估计坝体任意位置处的坝料参数值。（3）建立了全区域三维空间网格模型，实现了施工仓面网格与有限元模型单元的匹配，提出了任意有限单元材料参数的精细赋值方法；并根据数字大坝系统采集的实际填筑过程及进度形象面貌，实现了大坝实际动态填筑加载过程的有限元模拟。（4）结合实际工程，建立了某心墙堆石坝的有限元精细模型，利用ADINA软件，进行了在实际施工质量和实际施工进程下的高土石坝施工期坝体结构性态的有限元计算；并在此基础上，分析了坝体的应力变形、拱效应、不均匀沉降等，可为高土石坝施工期安全分析提供更全面的依据，并可为大坝运行期的安全评估提供更准确的分析模型。更多还原

【Abstract】 The structural behaviors of high earth-rock dam, such as stress, deformation,uneven settlement, crack and arch effect, etc., are vital to the dam safety. In previousresearches, dam materials are generally considered to be homogeneous in the samedam district, and multistage gravity loads are acted on finite element model to analyzethe dam structural behaviors according to the planned dam schedule, which mayneglect the spatial differences of material properties under actual construction qualityand the influence of actual construction progress. Based on the related studies on thereal-time compaction quality monitoring technologies, a precise finite elementanalysis method of structural behaviors of high earth-rock dam during constructionperiod are studied using the digitized construction technology. Furthermore, a casestudy is illustrated, which proved that the method can provide a new way to assess thedam safety. The detail contents and achievements are as follows:(1) At first, the principle and method of nonlinear finite element analysis on highearth-rock dam are introduced briefly, and a detailed description of Duncan-ChangE-B constitutive relation model reflecting soil nonlinear stress-strain relationship isgiven. A model of high earth-rock dam during construction period is built using thelarge universal finite element software ADINA.(2) Acquisition method of compactor pass, rolling speed, compaction thickness,exciting force, moisture content and gradation are proposed using the digitizedconstruction technology. Moreover, spatial regression models of the compacteddensity and Duncan-Chang constitutive model parameters of earth-rock dam,including c,, k, n,R f,k band m, are established for calculating the initialmaterial parameters at any position of earth-rock dam.(3) A grid model for whole region is developed to match the surface grid andfinite element model unit. Additionally, a method is proposed to value the materialproperties of each element. Meanwhile, the stepping gravity loads and impoundingprocess are determined in terms of the actual construction process and damappearances.(4) The precise finite element model of a certain core rock-fill dam is establishedto calculate the structural behaviors using ADINA software. Based on these, the stress and deformation, uneven settlement and arch effect are analyzed. It seems that theproposed method provides a more accurate way to assess high earth-rock dam safetyduring construction period but operation period.更多还原