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本文根据多孔介质弹性变形与流体扩散在力学上的相互作用,选取了耦合本构关系式作为数学模型并对其求解,研究了地壳中三种类型断层在地幔物质上涌作用下,所产生的附加断层强度的变化和分布。主要结果是:(1)在空间上,“上涌”面所造成的断层强度软化区位于隆起的边翼地区;(2)在时间上,“上涌”对构造地震的触发滞后于隆起过程。本文通过对唐山地震的分析认为,地幔物质上涌在地震孕育和发生过程中起着重要的作用,并估算了震源面上的强度软化值。最后,求出了在“上涌”作用下,地壳中所产生的最大剪切应力分布。结果表明:“上涌”造成的破裂区域最易发生在地壳中层的隆起边翼地带,而且此区域形成的断层很可能是高倾角的断层。
According to the mechanical interaction between elastic deformation of porous media and fluid diffusion, this paper chooses the coupled constitutive equation as a mathematical model and solves it. The effects of three types of faults in the crust on the upwelling of mantle material are studied. Change and distribution of additional fault strength. The main results are as follows: (1) Spatially, the softening zone of fault strength caused by “upwelling” is located in the uplifted wing area; (2) In time, the “upwelling” triggered by tectonic earthquakes lags behind the uplift . Based on the analysis of the Tangshan earthquake, this article argues that the upwelling of mantle material plays an important role in the gestation and occurrence of earthquakes and the intensity softening value of the source surface is estimated. Finally, the maximum shear stress distribution in the crust is obtained under the effect of “upwelling”. The results show that the ruptured area caused by “upwelling” is most likely to occur in the uplifted wing area in the middle crust, and the fault formed in this area is likely to be a high-dip fault.