新疆某碾压式沥青混凝土心墙坝设计

某碾压式沥青混凝土心墙砂砾石坝建在新疆高寒地区,介绍了该沥青混凝土心墙轴线、心墙厚度、过渡层厚度的确定及心墙与坝基防渗体的连接方式,并对其进行了坝体三维有限元应力应变静力分析。结果表明:相对于浇筑式沥青混凝土心墙、土料心墙等坝型,碾压式沥青混凝土心墙坝宜选择较厚的过渡层,以利于心墙施工控制;心墙厚度主要取决于坝体高度和坝壳料可能的变形情况。经综合评价,该坝变形协调性良好,应力分布基本合理,沥青混凝土心墙不会发生水力劈裂和拉裂破坏,坝体结构布局较为合理。

Design Application of a Dam with Roller Compacted Asphalt Concrete Core Wall in Xinjiang

Such sand gravel dam with rolled asphaltic concrete corewall was constructed in alpine region in Xinjiang.The confirmation for the axial line of asphaltic concrete corewall and the thicknesses of the corewall and the transitional layer,and the joining treatment between the corewall and impervious body of dam foundation,as well as the static force analysis of stress and strain with triaxiality finite element applied on the dam body which were introduced in this paper.It points out that more thickly transitional layer is favourable for corewall construction control of rolled asphaltic concrete corewall dam compared with dam types such as pouring type asphalt concrete corewall dam and clay corewall dam etc.,and corewall thickness mainly depends on dam height and possible deformation situation of dam shell material.The dam body with reasonable structure layout,its asphalt concrete corewall will not have hydraulic fracture and tension fracture destroys on a basis of the comprehensive evaluation of the good dam deformation coordination and the basic reasonable stress distribution law.