求翻译：工程基础采用独立基础。基础持力层为 ②层粉质粘土，其地基承载力特征值fak=140kPa。基础基底进入持力 层不小于300，当基础开挖至设计标高未见持力层时，应继续开挖至持力层以下300，然后采用C15毛石砼垫至设计 标高。是什么意思？

Project basis using an independent basis. ② basic stratum of silty clay layer, the foundation bearing capacity values ​​fak = 140kPa. Base substrate into the bearing stratum is not less than 300, when no foundation excavation to the design elevation stratum, should continue the excavation to the fol

Foundation works using an independent basis. basis for a level 2 level powder quality clay, its foundation endurance value features kPa fak = 140. Based substrate to enter the power level is less than 300, when based dig to design elevation did not see a layer, should continue to dig to a level belo

The project foundation uses the independent foundation.The foundation holds the strength level is ②Level silty clay, its ground supporting capacity characteristic value fak=140kPa.The foundation basis enters holds the strength level not to be smaller than 300, when the foundation excavates to the de

Foundation of independent Foundation. Foundation bearing stratum for ② layer of silty clay, the Foundation bearing capacity characteristic value fak=140kPa. Foundation base into bearing layer not less than 300, not seen when the Foundation excavation to design elevation of bearing layer, should cont

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