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中文摘要：
主要研究大型混凝土试件在4种不同等级水压力下的裂缝扩展情况及相应的断裂韧度测定。试验采用楔人式紧凑拉伸试件，在试件表面粘贴全桥应变片和安装夹式引伸计测定裂缝的起裂、扩展长度和裂缝开口位移；在侧面安装压力传感器，测定压力水在裂缝内的实时变化情况。将水压力的作用计入试件劈裂的贡献，应用双K断裂模型计算其失稳断裂韧度、粘聚韧度和起裂韧度。为了增加水压的密封强度，试件的附加约束较多，为计算方便将其作为一个高强度的混凝土整体进行研究。研究结果表明随着水压的逐渐增加，试件的起裂荷载和最大荷载逐渐减小，且当水压达到0．4MPa时，在施加第一个水压循环时试件已经起裂，且最大荷载低于正常承受荷载的一半。将其起裂韧度的实测值与计算值进行比较，发现二者误差较小，满足工程需要。
英文摘要：
Wedge-splitting on compact tension test was carried out to experimentally study the crack propagation and fracture toughness with four different water pressures. Electric-resistance gauges arranged with full bridge were glued on the surface of the specimen to monitor the initial load and the length of crack propagation. Hydrostatic pressure measured by silicon pressure transducers was a major factor of splitting load. In order to simplify the calculation against reducing accuracy, the membrane, steel plate and concrete are considered a total specimen. Hence, the corresponding parameters such as compressive strength, tensile strength and Young＇s modulus in nonlinear softening model are recalculated. Based on the above results, the initial toughness, unstable toughness and cohesive toughness are studies by Double-K fracture model. The experimental results show that the initial load and maximum load decrease with the water pressure increasing. Results show that the calculated initial fracture toughness is close to the test measurement and the accuracy can meet the requirement in the engineering practice.
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