岩石动态断裂韧度温度相关性的实验研究

利用CCCD—SHPB（CentralCrackedCircularDisk—SplitHopkinsonPressureBar）试验系统对花岗岩试件实施同一加载速率、不同温度下的纯I加载试验，进而研究环境温度对岩石类材料动态断裂性能的影响。实验过程中控制加载脉冲，使得测试试件的加载速率基本一致，测得不同温度下试件两端平均栽荷P随时间的变化关系，将最大P-max心裂纹圆盘应力强度因子墨公式，获得不同温度下中心裂纹巴西圆盘岩石试件的动态断裂韧度蜀。。测试结果表明，温度处于10—100℃时，花岗岩动态断裂韧度K-Id温度的升高逐步下降，近似呈线性关系。

Experimental Study on Dependance of Toughness against Dynamic Fracture of Rocks on Temperature

In order to study effect of temperature on fracture properties of rock materials, the pure I loading test was carried out for the same granite specimen at the same loading rate and different temperatures by use of test system Central Cracked Circular Disk - Split Hopkinson Pressure Bar. In process of test, stress impulse was reg- ulated to keep consistent loading rate, changing temperature of specimens to observe variation of mean load P on the specimen ends with time. The maximum value of Pmax was introduced into formula of stress intensity factor KI of central cracked circular disk to obtain toughness Kta against dynamic fracture of rock specimens of Brazilian central cracked circular disk at different temperatures. The test results showed that when temperature increases from 10 to 100℃, the fracture toughness of rocks steadily reduce approximately linearly.