高寒地区混凝土重力坝温控防裂研究

针对雅鲁藏布江中游段特殊的高原气候条件，根据重力坝的施工进度计划，对混凝土重力坝施工期和运行期的温度场、应力场进行了动态的仿真计算．研究了在不同季节开始浇筑坝体混凝土时坝体约束区的应力场、施工期闸墩的应力场和冬季开始浇筑坝体的整体应力场；根据浇筑季节的不同、混凝土材料的不同、约束强弱的不同和经济实用的原则制定了相应的温控措施，保证坝体在施工期和运行期的安全．

Study on Temperature Control and Crack Prevention for Concrete Gravity Dams in Cold Highland Area

In view of the special plateau climate in the middle reaches of the Yarlung Zangbo River and base on the construction plan, we carried out the simulation caculation of the temperature fields and stress fields during the construction periods and operational periods for the concrete gravity dam. We obtained the stress fields of the dam restricted areas when concrete placing in different seasons, the stress field of pier during construction period, and also the whole stress field of the dam when concrete placing in winter time. According to the different concrete placing seasons, different concrete materials and different restraint abilities of the concrete, and some economic reasons, we made corresponding temperature control measures during construction and operational periods so as to ensure the safety of the dam concrete.