中文摘要：

利用大型多功能动静力三轴仪进行了不同应变速率（10-5、10-4、10-3和10-2 s -1）下，饱和混凝土劈拉试验，对其峰值应力、峰值应变、弹性模量、吸能能力等物理力学参数变化规律进行了研究，进而分析了饱和混凝土劈拉试验下的各力学参数率效应。从断裂力学角度，分析了饱和混凝土劈拉强度变化机理。基于对具有软化段的 Mazars 本构模型的改造，构建了饱和混凝土劈拉试验应力-应变全曲线方程。经验证，此模型能够较好吻合试验数据。

英文摘要：

The split tension tests of saturated concrete were carried out by 10 MN Large Static and Dynamic Triaxial Apparatus Func-tion under different strain rates（10 - 5、10 - 4、10 - 3 和 10 - 2 s - 1 ）. The mechanical properties,such as the peak stress,peak strain,elastic modulus and energy absorption were researched.And then,the rate effect on the mechanical properties of saturated concrete were ana-lyzed.From perspective of fracture mechanics,splitting tensile strength mechanism of saturated concrete was analyzed. Based on the transformation of Mazars constitutive model with softened section,the equation of stress - strain curve is established.It was verified that the model fits the data of the test well.