软土对高频地微动信号有滤波作用，对低频信号起放大作用，而硬土层则相反。
Soft soil can filter high frequency signals, but can amplify low frequency signals.
本文在研究发震断层上覆土层中含有软夹层的基础上，采用平面应变有限元法模拟了发震断层错动时，含有硬夹层的上覆土层的破裂过程。
In this paper, we use the plain stain finite element method, simulate the rupture process of the overlaying soil with hard interlayer and analyze its failure states.
主tpy - 30型钻机是一种液压浅孔物探普查钻孔机，该机主要适用于土层，沙土层和中硬岩层中的钻进。
TPY-30 drilling machine is a type of shallow-hole drilling machine for exploration, it is suitable for drilling in soil, sand soil and medium harden rock drilling.
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