A study on the electrical potential of rocks during creep deformation

本实验研究旨在为进一步了解从晶体到岩石等岩土材料在压裂过程中的电位变化做出贡献。电势以交流和直流方式测量。从实验结果可以得出以下结论：1)实验结果清楚地表明，变形、破裂过程在岩土材料中诱发电位。2)感应电势的大小既取决于矿物或颗粒的压电特性，也取决于矿物在断裂或滑动引起的位错过程中由于变形和晶间或粒间分离和/或滑动而引起的电子分离所引起的力矩。3)蠕变加载初期，感应电势先减小后增大。这一观察结果与所有测试材料的观察结果一致。由于这些原因，电势测量技术作为岩石破坏预测技术之一，可以转化为声发射测量，这表明电势测量技术是有效的。

This experimental study was undertaken to make further contributions to the understanding of electric potential variations during fracturing process of geomaterials, which ranged from crystals to rocks. Electric potential was measured as AC and DC. From the experimental results, the following conclusions may be drawn :1)The experimental results clearly indicate that the deformation, fracturing processes induce electric potential in geomaterials.2)The magnitude of induced electric potential both depends upon the piezo-electric characteristics of minerals or grains and the moment caused by the separation of electrons of minerals as a result of deformation and inter-crystal or inter-grain separation and/or sliding during dislocations as a result of fracturing or sliding.3)At the early stage of creep loading, the induced electric potential first decreases, and then it starts to increase. This observation is consistent with the observations on all materials tested.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.