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理论研究[1]表明,环境水介质的动态对岩石中裂缝的应力腐蚀过程有很大的影响。但迄今为止,岩石的应力腐蚀实验都是在水介质静止情况下作的。本实验对比研究了蒸馏水静止和流动情况下云南大理岩试件应力腐蚀引起的亚临界裂缝扩展特征。结果表明,裂缝周围水介质的流动会加速裂缝端部的应力腐蚀过程,这对于震源过程及临震前兆的研究可能有重要意义。样品采用紧凑拉伸试件,同时测量了断裂韧性K_(Ic)=(1.41±0.013)kg·mm~((-3)/2),并对人工狭窄锯口与天然初始裂缝的试件进行了对比测量,认为对于云南大理岩的紧凑拉伸试件可以用人工狭窄锯口代替天然初始裂缝。
Theoretical studies [1] show that the dynamic of environmental water medium has a great influence on the stress corrosion process of cracks in rock. So far, however, rock stress corrosion experiments have been performed at rest in aqueous media. In this experiment, the characteristics of subcritical crack propagation caused by stress corrosion of marble samples in Yunnan Province under static and flowing conditions were compared. The results show that the flow of water around the fracture will accelerate the stress corrosion at the tip of the fracture, which may be of great significance for the study of the source process and precursors. Tensile toughness (Ic) = (1.41 ± 0.013) kg · mm ~ (- 3) / 2) was measured and the samples with artificial stenosis and normal initial fracture In contrast to the measurements, it is considered that artificial initials can be used instead of natural initial cracks for the compact tensile specimens of marble in Yunnan Province.