含瓦斯煤体加载破坏声-电前兆信息试验研究

发布时间：2019-01-15 20:29

【摘要】：针对含瓦斯煤体加载破坏前兆信息难以识别、提取的研究现状,自行研制了含瓦斯煤体加载声-电监测装置,对含瓦斯煤体加载全过程进行实时监测以获取声-电前兆信息。试验结果表明:声-电监测系统能够捕捉到含瓦斯煤体产生的电荷与声发射信号,加载过程中部分电荷信号先于声发射信号变化,声-电信号的产生与煤体内部裂纹扩展相关;煤体内部自由电荷与声发射信号的产生具有本质上的区别,前者是在压电效应、摩擦作用、微破裂新生表面电荷分离以及瓦斯运移携带电荷等综合叠加作用下产生,而后者是煤体内部裂纹扩展以脉冲波形式释放应变能的过程;通过划分含瓦斯煤体加载破坏声-电前兆信息异常区域,确定了声-电监测技术应用于矿山动力灾害预警的可行性。
[Abstract]:In view of the fact that it is difficult to identify the precursor information of gas bearing coal body loading and damage, the authors have developed a new acoustic-electric monitoring device for the loading of gas-bearing coal body, and carried out real-time monitoring of the whole process of loading gas coal body in order to obtain the acoustoelectric precursor information. The experimental results show that the acoustic electric monitoring system can capture the charge and acoustic emission signals generated by gas-bearing coal, and some of the charge signals change before the acoustic emission signals during loading, and the generation of acoustic electrical signals is related to the propagation of cracks in the coal body. The generation of free charge in coal body is essentially different from that of acoustic emission signal. The former is produced by the combined action of piezoelectric effect, friction effect, charge separation on the surface of micro-fracture and charge carried by gas transport. The latter is the process of releasing strain energy in the form of pulse wave. By dividing the abnormal area of acousto-electric precursor information for loading and destroying gas-bearing coal body, the feasibility of applying acoustic-electric monitoring technology to mine dynamic disaster early warning is determined.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金面上资助项目(11172121,51274114,51374123)
【分类号】：TD712

【参考文献】