These layers are called strata and a single layer is called a stratum.
这些岩层被称作地层（strata）（stratum的复数形式）， 单个岩层称为stratum。
When the bearing stratum at the tip of bored pile is sandy soil stratum, the method of pile tip pressure grouting can effectively improve the bearing capacity of single piles.
泥浆护壁钻孔灌注桩当桩端持力层为砂土层等非岩石层时，通过桩底压密灌浆能有效地提高单桩承载力。
The fluid saturated porous viscoelastic media is closer to actual stratum than Biot media and single-phase media, and the researches on its dynamic response will be more reliable.
黏弹性流体饱和多孔介质模型比采用单相介质或者弹性饱和孔隙介质更接近实际的土层介质，来该模型来研究土层介质的动力响应更为合理。
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