摘要
利用煤岩损伤理论和煤岩材料的固有缺陷分布特征,推导了煤岩破坏过程中的声发射理论模型,建立了岩石声发射率与应变过程、加载速率、材料均质度、初始损伤、材料固有特性等的理论关系,通过相关实验验证了该模型的正确性;理论推导、计算机模拟和实验室试验证实,均质度不同的岩石等材料应变过程中,声发射率变化规律有3种模式,即随应变增加的声发射率(指数)上升型、先升后降型和平稳型。工程实际应用中,应根据岩石等材料具体分布,掌握岩石等材料破坏前兆规律,才能根据声发射变化特征判断材料破坏动态。
Based on the theory of coal and rock damage and the distr ibution characteristics of the inherent defects of coal and rock, a mathema tical model of acoustic emission (AE) for the description of rock damage variati on is established, and the theoretical relation of the AE rate of rock with the strain process, load-ing rate, coal or rock uniformity, original damage, the in herent charac-ter of materials and so on is derived. This model agrees quite wel l with test results obtained in the laboratory. By theoretical derivation, com-puter simulation and laboratory test, the rock with different uniformity has th ree variation modes of AE rate during strain, i.e. ascend mode, calm mode and a scend-descend mode. In the engineering application, we should make concrete ana lysis according to materials and find out the omen of rock damage, so we can ju dge the damage development of rock according to character of AE variation.
出处
《矿业安全与环保》
2004年第1期31-33,56,共4页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(50134040)
