盖下坝水电站施工期温度应力及损伤仿真分析

Simulation on Thermal Stress and Damage of Gaixiaba Dam during Construction Period

结合盖下坝水电站工程实际情况,采用ANSYS软件及其二次开发技术,对该混凝土拱坝施工期的温度场和应力场进行全过程的三维仿真计算,得出施工期最高温度和最大温度应力。同时,利用损伤有限元程序对该大坝进行了损伤仿真计算,得出施工期重要时刻的损伤场。仿真结果表明,在合理的温控措施下,大坝施工期温度应力远小于设计容许值,损伤值也较小,施工期不会出现宏观裂缝。

According to the actual pouring of Gaixiaba Arch Dam, the three-dimensional thermal and stress fields of dam during whole construction period are simulated by using ANSYS and its secondary developed programs, and the maximum temperature and thermal stress are obtained. At the same time, the damage status of dam is also simulated by self-developed damage finite element program, and the damage fields of dam in some key construction moments are achieved. The simulations show that the thermal stress of dam is much less than the design allowable value and the damage value is smaller after implementing reasonable temperature control measures, and the dam will not appear macro crack during construction period.