茅坪溪堆石坝沥青混凝土心墙施工温度控制

Temperature Control over Asphaltic Concrete Core in Maopingxi Dam

三峡茅坪溪防护大坝是采用沥青混凝土心墙防渗的土石坝,其坝顶高程为 １８５ ｍ,坝顶宽 １２ ｍ,最大坝高１０４ ｍ,土石方总填筑量近１２００万ｍ３。其中作为防渗主体的沥青混凝土心墙高９３ ｍ,心墙总防渗面积４．６２万ｍ２,沥青混凝土总方量为５．３１万ｍ３。沥青混凝土施工工艺与普通水泥混凝土不同,它采用热施工,在一定温度条件下进行拌和、摊铺、压实,需严格实行施工温度控制。

The Maopingxi earth & rock dam with an asphaltic concrete core has a maximum height of 104 m, with a dam crest width of 12 m at elevation of 185 m, a total earth and rock backfill of nearly 1 200 m3. The asphaltic core has a height of 93 m, with a total asphaltic concrete volume of 53 100 mf and a total impermeable area of 46 200 m2. The asphaltic concrete construction is different from that of the traditional concrete. A hot construction approach is employed for the former. The asphaltic concrete must be batched, spread and compacted under certain temperature condition.