基于三维有限元的大体积混凝土温度控制与开裂风险分析OA

To address the limitations of traditional analytical methods—such as insufficient computational accuracy,difficulty in accurately capturing three-dimensional non-uniform characteristics,and inadequate representation of multi-field coupling effects in simulating the temperature and stress fields of mass concrete structures—a three-dimensional finite element numerical analysis method for temperature control of mass hydraulic concrete structures is proposed based on the Midas FEA NX platform.Considering the multi-field coupling effects under construction conditions—such as structural constraints,casting environment,concrete hydration,and temperature control measures—the proposed method is validated through a case study of the Xiaomiao pumping station in the phase II Hefei water diversion project from the Yangtze River to the Huaihe river.By establishing a multi-index evaluation system incorporating temperature field distribution,stress field response,and cracking risk coefficients,the method systematically evaluates the model's convergence,computational efficiency,and its responsiveness to temperature control measures and seasonal environmental variations.This method demonstrates excellent numerical stability and predictive accuracy in simulating the early hydration heat process of mass concrete.Compared with simplified two-dimensional methods,it more precisely reflects the internal temperature gradient distribution and stress concentration phenomena within the structure,while significantly enhancing the simulation adaptability to complex boundary conditions and material nonlinear behavior.