The feasibility to simulate the initial earth stress of the large underground structure by using the algorithm of dynamic relaxation and system damping in LS-DYNA is investigated.

主要研究使用LS-DYNA的动力松弛算法和系统阻尼算法相结合来求解大型地下结构初始地应力状态的可行性。

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The study also goes to the influence, upon stress waves, of the piles relaxation time, the equivalent viscous damping coefficient of soil around the pile and the unit rigidity of soil below the pile.

同时，分析了桩身驰豫时间、桩侧土的等效粘滞阻尼系数、桩底土的单位刚度等因素对应力波的影响。

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Accordingly, the damping of ZA27 alloy is the thermal activated relaxation process as well as the results of superimposition of multiple relaxation processes.

ZA2 7合金的阻尼是热激活驰豫过程，是多个驰豫过程叠加的结果。

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