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利用大型多功能静动力三轴仪分别进行了干燥混凝土与饱和混凝土试件在不同应变速率下的动态劈拉试验.对混凝土的物理力学参数进行了统计分析,研究了加载速率、湿度对混凝土劈拉强度的影响.结果表明:干燥混凝土与饱和混凝土的劈拉强度随应变速率的增大而提高,饱和混凝土的劈拉强度对应变速率更为敏感;低应变速率下,饱和混凝土劈拉强度低于干燥混凝土的,而在高应变速率下饱和混凝土强度更高.建立了干燥混凝土与饱和混凝土在不同应变速率下的应力、时间曲线与同步声发射参数之间的对应关系,在此基础上对比分析了干燥混凝土与饱和混凝土劈拉损伤特性.
The dynamic splitting tests of dry concrete and saturated concrete specimens at different strain rates were carried out respectively with large multi-functional static and dynamic triaxial apparatus.The physical and mechanical parameters of concrete were analyzed statistically, and the influence of loading rate and humidity on concrete splitting The results show that the splitting tensile strength of dry and saturated concrete increases with the increase of strain rate, and the splitting tensile strength of saturated concrete is more sensitive to strain rate. At low strain rate, the splitting tensile strength of saturated concrete is low In dry concrete, the strength of saturated concrete is higher at high strain rate.The relationship between the stress and time curves of dry concrete and saturated concrete at different strain rates and the parameters of synchronous acoustic emission is established, on the basis of which, The splitting-damage characteristics of dry concrete and saturated concrete are analyzed.