基于声发射的岩石破裂应力场动态反演

为获取岩石在破裂过程中的动态应力场，首先进行室内物理试验获取声发射数据，在此基础上基于能量耗散原理，利用实测声发射信息建立起岩石细观损伤表征方程，并通过FLAC3D内嵌FISH语言进行二次开发，自动搜索声发射损伤影响范围内岩石单元并对其力学参数进行弱化，计算得到较为真实的岩石破裂动态应力场。结果表明，计算得到的岩石破裂应力场与实测结果有良好的对应关系，验证了岩石细观损伤表征方法的合理性。同时，获得的岩石动态破裂应力场不仅可以从岩石力学的角度解释破坏产生的原因，也对预测岩石下一步破坏具有指导意义。但这种方法仍具有一定的局限性，需要进一步的探索研究。

Dynamic inversion of rock fracturing stress field based on acoustic emission

This study aims to investigate the dynamic stress field during the process of rock failure. Firstly, physical model experiments were conducted to obtain the results of acoustic emission (AE) in the laboratory. According to the measured results, an equation was established for describing characteristics of the rock mesoscale damage based on the energy dissipation theory. Then this equation was implemented to FLAC3D software by using the FISH language. The improved equation can not only automatically search rock units within the damage scope of AE, but also weaken mechanical parameters of meso units. Finally, the relatively true rock fracture dynamic stress field was successfully acquired. The calculated results of rock failure stress field showed good agreement with the experimental results, which verified the rationality of mesoscale damage characterisation method. Simultaneously, the obtained dynamic rock fracturing stress field can not only explain the damage causes from the point view of rock mechanics, but also can predict the location of next rock failure. However, this method still has some limitations, and it needs for further explorations.