人工提前触震减灾的动力学原理仿真研究

This research is on the feasibility of wave’s focus in non-elastic media. The.time reversal invariance of wave in un-even crustal media has been studied by dynamic computation based full scale 3-D FEM model. The results show that the inhomogeneity do not weaken the time reversal effect, and, the more intense the inhomogeneity, the better the focus effect is. For non-linear media, the character has been divided into waveform aberrance and the obsorb of energy. And wave differential equations have benn studied to obtain the time reversal invariance of.their solutions. The results show that the former one is invariant while the later one is variant. Noticed that both the processes of Earthquake and the focus, just are a large linear domain and a small non-linear domain are concerned, after verifying the invariance in multiply connected domain, it becomes obvious that focus onto non-linear domain can be conducted approximately with an extra boundarycondition at the interface between linear and non-linear domain.

运用时间逆转原理，采取非线性动态有限元方法，研究在地壳中人工实现脉冲响应的逆性过程的有效办法，利用地壳的巨大惯性储能，考虑到地震图中已包含了地壳中的非均匀性信息，通过波的遍历特性，最终将长时间内馈给的能量，集中在一瞬间、聚焦于一点，形成一个很强的冲击。在此基础上，提出通过动力学原理人工提前触发地震达到减灾目的基本思路。