基于声发射的煤岩破断全过程损伤演化及分形研究

项目名称： 基于声发射的煤岩破断全过程损伤演化及分形研究

项目编号： No.51204113

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 张茹

作者单位： 四川大学

项目金额： 25万元

中文摘要： 声发射（acoustic emission，简称AE）的事件数大小和源分布特征是岩石损伤演化过程的直接表征和反映，在煤炭深部开采的冲击地压、煤与瓦斯突出等工程灾害预测中具有广阔的应用前景。但其理论研究落后于工程实践，基础试验和现场预警研究仍然不足，因此迫切需要对煤岩声发射特征进行系统研究。本项目拟用分形理论，通过宏细观试验相结合的方法，对煤岩破断全过程中的AE时空演化和分形特征进行系统研究。通过研究，探明不同损伤模式下煤岩破断全过程中声发射特征差异，揭示不同采动力学行为的煤岩体微破裂时空演化、能量释放及分形规律，提出基于AE损伤三维定位、时序演化特征及能量释放耦合研究的煤岩失稳前兆判别条件。从而扩充煤岩声发射基础理论与试验研究成果，为声发射技术手段更好的应用于煤炭工程灾害现场监测工作提供支撑和参考，还可借鉴于深部矿产资源开采等地下工程中声发射对围岩稳定和破坏特征监测的研究工作。

中文关键词： 煤岩；声发射；时空演化；开采方式；分形

英文摘要： Events number and 3D location distribution of Acoustic Emission (AE) are first-hand data for rock damage evolution process. It is widely used when forecasting pressure bump and coal-gas outburst in deep coal mining. However, engineering practice of AE is advanced than the theory research, at the same time, research on basic tests and on-site early warning of AE is very insufficient. So it is very urgent to carry out the systematic research on the coal acoustic emission properties. Introducing fractal theory and adopting the method of macro-mesoscopic experiments, the space-time evolution and fractal characteristic of AE during the whole fracture process would be studied in this subject. The difference of coal AE properties would be found out under the different damage model. The space-time evolution of coal micro cracks and energy emission and fractal rules under different mining-induced conditions would be announced. Coal failure criterion based on AE space-time distribution and energy emission would be put forward. Thereby, the basic theory and test achievements of coal acoustic emission would be expanded. At the same time, the research results would provide reference for AE forecasting in mining-induced coal disasters, and also provide reference for the research on stability and failure monitoring of surround

英文关键词： Coal；Acoustic emission；Space–time evolution；Mining layout；Fractal