自然环境对大坝混凝土力学性能和抗渗性能的影响

Influence of Natural Environment on Mechanical Properties and Impermeability of Dam Concrete

分层浇筑大坝混凝土的层面之间的接触面是混凝土内部的薄弱部分,会增加大坝渗流和整体滑动的风险。文中分析了大坝周边环境条件,研究温度、湿度和风速对大坝混凝土层间性能的影响,包括抗拉劈裂强度、抗氯离子渗透性。结果表明:温度和风速的增加会显著降低大坝混凝土的层间抗拉劈裂强度和抗氯离子渗透性。降低相对湿度对混凝土层间性能有不利影响。温度或风速越高,分层混凝土的破坏程度越明显。研究结果为大坝施工提供参考。

The contact surface between layers of dam concrete is a weak part of concrete,which increases the risk of seepage and overall sliding.In this paper,the influence of temperature,humidity and wind speed on the interlaminar properties of the dam concrete is studied,which include tensile splitting strength and chloride ion permeability.The results show that the increase of temperature and wind speed can significantly reduce the interlayer tensile splitting strength and chloride ion permeability resistance of dam concrete.At the same time,the reduction of relative humidity has an adverse effect on the interlaminar performance of concrete.The higher the temperature or wind speed,the more obvious the damage degree of layered concrete.The research results provide reference for dam construction.