(1)必须根据设计断面,分层填筑、分层压实。
(2)填筑路堤宜采用水平分层填筑施工。如原地面不平,应由最低处分层填起,每填一层,经过压实符合规定要求之后,再填上一层。
(3)不同土质混合填筑路堤,以透水性较小的土填筑于路堤下层时,应做成4%的双向横坡;如填筑上层时,不应覆盖在由透水性较好的土所填筑的路堤边坡上。
(4)不同性质的土应分层填筑,不得混填。每种填料层累计总厚不宜小于0.5m。
(5)凡不易受潮湿或冻融影响而改变其体积的优良土应填在上层,强度较小的土应填在下层。
(6)路堤填土宽度每侧应宽于填层设计宽度,压实宽度不得小于设计宽度,最后削坡。
(7)原地面纵坡大于12%的地段,可采用纵向分层法施工,沿纵坡分层,逐层填压密实。
(8)山坡路堤,地面横坡不陡于1:5且基底符合规定要求时,路堤可直接修筑在天然的土基上。地面横坡陡于1:5时,原地面应挖成台阶(台阶宽度不小于2m),并用小型夯实机加以夯实。填筑应由最低一层台阶填起,并分层夯实,然后逐台向上填筑,分层夯实,所有台阶填完之后,即可按一般填土进行。
(9)高速公路和一级公路,横坡陡峻地段的半填半挖路基,必须在山坡上从填方坡脚向上挖成向内倾斜的台阶,台阶宽度不应小于2m。
(10)河滩路堤填土,应连同护道在内,一并分层填筑。可能受水浸淹部分的填料,应选用水稳性好的土料。
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