In this paper a numerical simulation of the construction process of roller compacted concrete (RCC) dams is presented. The following features of construction of mass concrete have been considered: hydration heat, age, placing temperature, starting placement date, and placing speed. A 3-D finite element model of the Long-Tan RCC dam, which is to be built in the Guangxi Autonomous Region in China, was analyzed. Temperature distribution and evolution inside the RCC dam were calculated during and after the completion of the dam. Using Fortran TM code, a 3-D thermal simulation analysis of a high RCC dam can be realized on a computer at the construction site. Based on the real factors during the construction period, engineers can predict the distribution of temperature in the RCC dam. Therefore, engineers can take appropriate measures to control concrete temperature to reduce thermal stress within the dam. The effects of the concrete placing temperature, construction speed, and starting date on the temperature are discussed. It has been found that the maximum temperature in a dam can be reduced by 20% through temperature control measures.Résumé : Cet article présente une simulation numérique du procédé de construction de barrages en béton compacté au rouleau (BCR). Les caractéristiques suivantes de la construction en béton de masse ont été considérées : chaleur d'hydratation, âge, température de mise en place, date de début de mise en place et vitesse de mise en place. Un modèle 3-D par éléments finis du barrage BCR de Long-Tan, qui sera construit dans la région autonome de Guang-Xi, en Chine, a été analysé. La distribution et l'évolution de la température à l'intérieur du barrage BCR ont été calculées pendant la construction et après l'achèvement du barrage. Utilisant le code Fortran TM , l'analyse de simulation thermique 3-D d'un barrage BCR élevé peut être réalisée sur un ordinateur sur le site de construction même. En se basant sur des facteurs réels durant la construction, les ingénieurs peuvent prédire la distribution de la température dans le barrage BCR. Ainsi, les ingénieurs peuvent prendre les mesures appropriées pour contrôler la température dans le béton afin de ré-duire la contrainte thermique dans le barrage. Les effets de la température de mise en place du béton, de la vitesse de construction et de la date de début de la mise en place sur la température sont analysés. Nous avons remarqué que la température maximale dans le barrage peut être réduite de 20 % par des mesures de contrôle de la température.Mots clés : barrage en béton compacté au rouleau, analyse de simulation thermique, méthode par éléments finis, champ de température, calendrier des travaux.[Traduit par la Rédaction] 1156 Chen et al.
Crack in polymer bonded explosive (PBX) components will influence the safety and reliability of weapon system. In order to accurately simulate the quasi-static fracture behavior of PBX components, the quasi-static arc Brazilian experiment of PBX explosive was carried out first. Then, the phase field method (PFM) and the traditional extended finite element method (XFEM) are used for the comparative simulation of the arc Brazil test process, in which both the maximum principal stress and the maximum principal strain initiation criterion are used in XFEM simulation. The calculation results show that the relative error of failure load calculated by PFM is small (less than 1%), while the error of XFEM calculation is large (the error of strain criterion and stress criterion are -61% and 42% respectively). Meanwhile, the fracture initiation locations calculated by PFM are located at 1/4 and 3/4 away from the end face of the Brazilian sample, which is in good agreement with the experimental results. In addition, PFM avoids the problems of crack mutation and discontinuity in XFEM. The results show that the PFM can accurately calculate the quasi-static fracture behavior of PBX components.
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