A study on the electrical potential and long term strength of rocks during cyclic deformation

岩石的电位响应一直受到特别的关注，因为在地震发生之前和发生期间会发生一些明显的电位变化，并将其用于地震预报。最近的实验研究表明，岩石在变形和破裂过程中表现出明显的电位变化。这意味着它也可以用于评估岩石结构的稳定性。这项研究是进一步的实验贡献的认识电位的变形岩石在蠕变和循环加载。实验结果表明：1.实验结果清楚地表明了岩土材料在变形、破裂过程中产生了电位; 2.土样轴向应变的突然增大与土样的尖峰状电信号直接相关，这是微破裂的明显标志。在破坏之前，观察到明显的地震电信号。可以肯定地说，最大的地震电信号将被观察到时，不稳定的破裂过程开始。3.作为岩石破坏的预测技术之一，这可能会成为一个AE测量作为这些更多的结果，这是显而易见的，电位测量技术是有效的。

The electrical potential response of rocks has been receiving a particular attention since some distinct electric potential variations occur before and during earthquakes occurs, and they are used for the prediction of earthquakes. Recent experimental studies showed that rocks exhibit distinct electric potential variations during deformation and fracturing processes. This implies that it can be also used in the assessment of the stability of rock structures. This study is a further experimental contribution to the understanding of the electric potential induced by the deformation of rocks during creep and cyclic loading. From the experimental results described in this report, the following conclusions may be drawn :1.The experimental results clearly indicate that the deformation, fracturing processes induce electric potential in geomaterials.2.The spike-like electric signals are directly associated with the sudden increase of axial strain of the sample, which are a clear indication of micro fracturing. Before the failure, distinct seismic electric signals are observed. It can be firmly stated that the largest seismic electric signals will be observed when the unstable fracture process starts.3.As one of the prediction technique of rock failure which could turn into an AE measurement as a result of these more, it became clear that electric potential measurement technique was effective.