溪洛渡拱坝陡坡坝段施工期温度应力仿真分析

溪洛渡拱坝是拟建的世界上最高的混凝土拱坝之一,由于陡坡坝段在施工期与运行期的受力状态均比较复杂,存在较大面积的应力集中分布。为恰当地选择温控措施,缓解基础约束应力,本文选取了4号、25号坝段作为冬季与夏季施工的代表,进行三维有限元仿真计算,得到了不同浇筑时间、不同分层方法下陡坡坝段的温度与温度徐变应力分布规律,并进行了几种可行温控措施的敏感性分析,为陡坡坝段采取合适温控措施提供依据。

Simulating Analysis of Xiluodu Arch Dam Steep Slope Dam Blocks Temperature Stresses Imitative Analysis during Construction Period

Xiluodu arch dam is one of highest concrete arch dams to be built in the world.Load bearing conditions of the steep slope dam blocks are rather complicated during the construction and operation peroids and there are relatively large stress concentration areas.In order to select appropriate temperature control measures to reduce the stresses in the foundation restriction zones,in this paper dam blocks no.4 and no.25 are taken as representative ones to be constructed in winter and summer,for these dam blocks 3dimensional finite element simulating calculation is carried out,temperature and temperature creep stress distribution condition in these dam blocks with different placement time and layer are obtained.Sensitivity anlyses are performed for some practicable temperature control measures.These provide basis for selection of suitable temperature control measures for the steep slope dam blocks.