大型水闸闸墩施工期温度应力仿真和裂缝控制研究

摘要

In light of the difficulty in temperature control and crack prevention for large concrete sluice piers, considering surface insulation, internal cooling, strength of the foundation and the climate, the basic theory of thermal stress of concrete and 3-D FEM combining with a cooling pipe discrete model and iteration method are employed to carry out a study of the cracking mechanism. According to the 3-D dynamic simulation of the temperature field and stress field for the pier of the Caojie Project, reasonable during-construction temperature control measures are put forward for reference.%针对大型水闸闸墩混凝土施工期温度控制和裂缝预防比较困难的问题，基于非稳定温度场和应力场三维有限元仿真计算技术，集成混凝土内部冷却水管的离散模型和迭代算法，研究了表面保温、内部降温、地基强度、环境气候等因素对闸墩开裂机理的影响。依托草街大型闸坝工程，对易开裂闸墩混凝土施工全过程进行了动态跟踪仿真计算，提出了施工期切实可行的温控措施，取得了较好的防裂效果。研究表明，表面保温结合内部水管降温的温控措施具有一定的工程应用前景，对无施工分缝的大型水闸工程混凝土施工具有重要的参考价值。