论文部分内容阅读
选用云南大理县的不均匀大理岩试样,用三点弯曲法测K_(IC),结果表明:对于不均匀的岩石试样,K_(IC)离散性较大。尖锯口裂缝予制试样和疲劳裂纹予制试样所得K_(IC)无明显差别(分别为134.8±32.8公斤/厘米~(3/2)和137.9±31.0公斤/厘米~(3/2),并且试样大到和厚到一定尺度后,K_(IC)趋于稳定值(139.3±27.7公斤·厘米~(-3/2)),而温度对K_(IC)有明显影响。从常温增高到400℃,K_(IC)减小约30％。同时,由声发射结果看出,破裂的声发射特征与加栽速率有关。
Uneven marble samples were selected from Dali County, Yunnan Province. The K_ (IC) was measured by three-point bending method. The results show that K_ (IC) is more discrete for inhomogeneous rock samples. There was no significant difference in the K_ (IC) values of the cracked pre-cracked specimens and the fatigue crack pre-test specimens (134.8 ± 32.8 kg / cm ~ (3/2) and 137.9 ± 31.0 kg / cm ~ (3/2 ), And the K_ (IC) tends to a stable value (139.3 ± 27.7 kg · cm -3/2) after the samples are large and thick to a certain extent, while the temperature has a significant effect on the K_ (IC) At room temperature, the K_ (IC) decreases by about 30% at 400 ℃ .At the same time, the acoustic emission characteristics of rupture depend on the acoustic emission.