不同岩石声发射定位算法及其实验研究

Experimental Study on Different Rock Locating Algorithms with Acoustic Emission

应用声发射定位技术实验研究了不同加载方式下不同岩石(花岗岩、砂岩)破裂过程中内部裂纹扩展的三维空间演化过程;对Geiger定位算法和单纯形定位算法的定位原理进行了分析,并对两种定位算法的定位精度进行了探讨.研究表明:声发射定位事件直观反映了裂纹萌生、扩展的动态演化过程,声发射事件的定位结果与岩石试样的实际破坏模式非常吻合;单纯形算法的定位精度要高于Geiger算法,但定位的声发射事件数少于Geiger算法.在基于声发射定位技术对岩石失稳破裂过程进行研究时,可根据具体情况选用定位方法,也可通过两种或多种定位算法的对比分析来获得更精确的定位结果.

Acoustic emission（AE） locating technique was applied to studying the 3-D evolutionary process of micro-cracks during different rock（granite/sandrock） failures under different loading conditions. The locating principles of both Geiger algorithm and simplex algorithm were analyzed with their locating accuracies comparatively discussed through experimental verification. The results showed that locating an event by acoustic emission can visually reflect the whole dynamic process from initiation and propagation to breakdown of micro-cracks, just like the process of rock failure. The locating accuracy of simplex algorithm is higher than Geiger algorithm but, as to the number of locating events by AE, the latter is more than the former. However, when studying the instability and failure process of rock by AE locating technique, what algorithm is feasible should be decided as the case may be. And two or more locating algorithms are simultaneously available to compare then analyze the results so as to get more accurate findings.