弹性多孔介质中应力-孔隙压耦联理论在新丰江水库地震研究中的应用

Application of the Stress-Pore Pressure Coupled Theory of Porous Medium to the Research of Inducing Earthquakes at Xinfengjiang Reservoir

本文用二维有限元法,将弹性多孔介质中应力-孔隙压耦联理论应用于新丰江水库诱发地震机制的研究。计算中,不仅考虑了均匀、非均匀模型的耦联,还考虑了断层的性质、产状对耦联作用的影响及库水位随时间的变化。 结果表明:附加应力与孔隙压耦联作用是诱发水库地震的重要因素。新丰江水库地震不仅与库区存在的断裂、高密度基底有关,还与库水的加、卸载方式有关。

The stress-pore pressure coupled theory of porous medium is applied to the research of inducing mechanism for the Xinfengjiang reservoir seismicity using two-dimension FEM in the paper.The calculated results show that the stress-pore pressure coupled effect may be an important inducing factor of reservoir earthquakes. The induced seismicity in the Xinfengjiang reservoir area is not only related to the existing faults in the area, but also to the high-density basement and the change manner in water level.