含内边界非均匀材料三维FEM模型的时间逆转仿真研究

摘要

A 3-D typical model with inhomogeneous materials and inner boundaries is built by means of 3-D non-linear dynamical FEM.On the basis of theory of time reversal effect and simulation result,the possibility of touching off earthquake artificially is discussed.A new way of disaster reduction is put forward grounded upon touching off earthquake in advance,increasing the number of earthquakes and reducing magnitude.It is testified if the time reversed seismogram were used as the loading curve and an efficient source of force were exerted on the rock at the seismographic station,then artificial input energy will focus on the hypocenter and cause an intense impact,therefore an earthquake would be touched off.%运用3-D非线性动态有限元方法，针对地壳块体建立了一个材料非均匀的包含多个内部界面的三维典型模型，通过对模型的时间逆转效应的仿真研究，初步探讨了基于动力学原理人工触发地震的可能性，重新提出以提前触发地震、增加频度、降低震级为基本方法的消除震害原理。模拟结果表明，如果将地震图(seismogram)进行时间逆转后，作为加载曲线，在地震台站点上通过一个有效的力源加载于基岩，利用时间逆转效应，可以将人工施加的能量在某一瞬间集中到以往的震源，引起一个强烈的冲击，因而可能触发地震。