大体积碾压混凝土水冷管布设有限元分析比选

Finite element analysis comparison and selection of mass RCC water cooling pipe layout

大体积碾压混凝土浇筑凝结的过程中,会释放出大量的水化热,导致混凝土内部温度应力急剧上升。当温度应力超过混凝土的抗拉强度时,会产生温度裂缝进而影响结构的稳定性。大体积混凝土可通过内部敷设水冷管道,利用水流和坝体之间的热量置换,降低结构内部温度应力。本文通过采用计算机三维仿真模型模拟分析,对混凝土温控措施进行合理、科学的技术评估,比选出最优的水冷管道布置形式,有效预防了裂缝的产生,也可为日后黄金峡大坝碾压混凝土施工乃至秦岭地区类似工程施工提供经验。

A large amount of hydration heat will be released in the process of casting and setting of mass RCC,resulting in a sharp rise in the temperature stress inside the concrete.When the temperature stress exceeds the tensile strength of concrete,temperature cracks will occur and affect the stability of the structure.The mass concrete can be laid inside the water cooling pipe,using the heat displacement between the water flow and the dam body,to reduce the internal temperature stress of the structure.In this paper,reasonable and scientific technical evaluation of concrete temperature control measures is carried out through the simulation analysis by computer 3D simulation model,and the optimal water cooling pipe layout is selected to effectively prevent cracks,which can also provide experience for future RCC construction of Huangjinxia Dam and similar projects in Qinling Region.