地壳块体应力场动力学演变过程仿真的初步研究

PRELIMINARY RESEARCH ON EMULATING THE DYNAMIC EVOLUTION OF CRUSTAL STRESS, STRAIN AND DEFORMATION

运用三维非线性动态有限元方法 ,研究华北地壳块体对渤海、黄海潮汐水位变化的动态响应 ,得出该块体中各力学量随时间演变的数值结果以及动态、直观的三维仿真映象 ,并以此探索计算力学与地学综合研究的途径。从仿真模拟结果可以看出 :华北地区近期发生的几次较大地震均在应力较大或应力变化剧烈的地点。由于海洋动态载荷的量级小 ,计算结果的应力绝对值也很小 ,因此 ,这种吻合表明较小的动态载荷下的动态响应揭示了孕震构造的特征 ,显示了应力集中的地点。

Using the 3D dynamic finite element method the dynamic response of the North China crustal block to the water level variation of Bohai Sea and yellow sea is studied.The mechanical quantity varying with time and the 3D visualized moving pictures in crustal block are obtained, and based on which,the comprehensive approach to emulate the mechanics and geonomy is explored. From the emulating results,it could be seen that several late fairly big earthquakes in studied area occured in the place where the stress is higher or varies quickly.The calculated absolute stress value is small due to the small magnitude of the load.