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【多选题】
路堤施工时，路基填筑时下列哪些施工措施符合工程要求（）
A.
在路基开工之前，路基的试验段施工。
B.
随着填方高度增加，路基顶应设置截水埂。截水埂应开口设置临时排水沟，临时排水沟用水泥砂浆勾砌，以免冲刷边坡。
C.
高填方路堤须依据规范进行专项沉降和位移观测，观测方法按设计有关内容处理。
D.
填方路基必须按路面平行线分层控制填土标高，填方作业应分层平行摊铺。分层填筑的各层间应平整，符合平纵坡要求，不得出现积水，以免影响填筑及碾压质量。严格实行“划格上土，挂线施工，平地机整平”。运输车按要求卸料后先推土机粗平地机精平，依照测量人员埋置的桩位准确铺出设计要求的横、纵坡，并形成。
E.
路基表面平整，边线直顺，曲线圆滑，“三度”即填筑宽度、厚度、压实度要求合格。
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