A. 垫层顶面每边超出基础底边不宜小于300mm
B. 用于消除湿性黄土或膨胀土地基的粉质黏土垫层应当在土料中掺入适量的石块以增大其透水性
C. 垫层施工的质量检验分层进行，但是对于压实系数应每两层抽查一层，按10%抽检测
D. 利用贯入仪或动力触探检验垫层的施工质量时，分层检验点间距取垫层宽度的1／3～1／2
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