Preparation for construction: the surface of the under layer should be even and firm, and in accordance with the design requirement, without loose material and flaccid site, and need to reroll 2～3 times within full-width range of the subgrade with vibrati
Preparation for construction: the surface of the under layer should be even and firm, and in accordance with the design requirement, without loose material and flaccid site, and need to reroll 2～3 times within full-width range of the subgrade with vibrati
施工准备：施工前下承层表面要平整、坚实，符合设计要求，无松散材料和软弱地点，施工前要用振动压路机在路基全宽范围内复压2～3遍，同时进行压实度及弯沉检验，检查土基中是否有不合格点。