Digitized Construction Technology-based Precise Finite Element Analysis On High Earth-rock Dam Structural Behaviors During Construction Period

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.