Electromagnetic response during failure process including pre-phenomenon of gouge-bearing rock

研究表明，该断层泥是通过剪切变形而发生电极化(剪切极化)的。为探讨压实压实作用机理，测定了压实载荷作用下挤压出的高岭石孔隙水中电解液浓度随时间的变化。电解液浓度的变化方式取决于压实载荷的大小，但浓度一般随着时间的推移而减小。另一方面，在较大的加载循环中，在初始固结过程中可以观察到浓度的快速增加。这种电解质浓度的快速增加被解释为粘土在剪切作用下颗粒间粘结破裂的结果。次固结过程中浓度的普遍降低可以认为是粘土颗粒间粘结结构的结果。

It has been clarified that the gouge is polarized electrically (SIP: Shear-induced Polarization) by shear deformation. To solve the mechanism of SIP, the time variation of electrolyte concentration was measured in pore water of the kaolinite squeezed out under the compaction loading. The changing manner of the electrolyte concentration depends on the magnitude of compaction load, however, the concentration decreases with time generally. On the other hand, in the large loading cycle, the rapid increasing of the concentration was observed during the primary consolidation. This rapid increasing of the electrolyte concentration is interpreted as result of the collapsing inter-particle bonding of the clay by the shearing. General decreasing of the concentration during the secondary consolidation may be recognized as result of structuring the inter-particle bonding in the clay.