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为了解双轴受压下混凝土动态力学特性,采用真三轴材料试验机,对边长为300mm的立方体混凝土试件在应变速率为10-5、10-4、10-3s-1下进行双轴动态受压试验,研究了双轴受压下混凝土的抗压强度、弹性模量、峰值应变等力学特性,并与单轴压缩试验进行了比较。结果表明,双轴应力状态下的力学参数与单轴应力状态时相比均有所提高,且双轴受压时混凝土的各项力学参数受侧压力和加载速率的共同影响,并呈现出不同的变化规律。
In order to understand the dynamic mechanical properties of concrete under biaxial compression, a true three-axis material testing machine was used to test the cubic concrete specimens with a side length of 300 mm at a strain rate of 10-5, 10-4 and 10-3s-1 Axis dynamic compression test, the mechanical properties of concrete under biaxial compression such as compressive strength, elastic modulus and peak strain were studied and compared with uniaxial compression tests. The results show that the mechanical parameters in biaxial stress state are improved compared with that in uniaxial stress state, and the mechanical parameters of concrete under biaxial compression are influenced by both lateral pressure and loading rate and show different The law of change.