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本文根据地震的断层说观点在室温、围压600—1,200巴条件下研究了具切口的花岗闪长岩、辉长岩和大理岩试件的破裂发展过程。在连续增加的差应力作用下观测到:切口内部充填的软弱夹层首先发生剪切变形和破裂,接着在切口端部一侧扩展张性裂纹,然后在切口前缘方向扩展剪切裂纹,最后发生贯通试件的剪切和张裂-剪切主破坏。张裂纹扩展长度受到围压的强烈抑制。岩石的切口结构和岩性变化对破裂迹线的空间展布和主破坏机制有重要影响。讨论了实验结果在断层扩展型地震的形成过程及其在预报预测方面的意义。
In this paper, the rupture development of notched granodiorite, gabbro and marble specimens was studied under the conditions of 600-1,200 bar confining pressure at room temperature and confining pressure according to the viewpoint of the fault of the earthquake. Under the continuously increasing differential stress, it is observed that the weak intercalated in the incision first undergoes shear deformation and rupture, then expands the flaw on one side of the incision, and then expands the shear crack in the direction of the incision leading edge Shear and break through the specimen - Shear main destruction. The crack propagation length is strongly suppressed by the confining pressure. The change of incision structure and lithology of rock has an important influence on the spatial distribution and main failure mechanism of ruptured trace. The formation of the fault-extended earthquake and its significance in forecasting and forecasting are discussed.