坝体温度变化对碾压混凝土坝水平位移影响分析

Analysis on Influence of Dam Body Temperature Variation on Horizontal Displacement of RCC Dam

文章以某碾压混凝土坝7号坝段作为示例,从坝体温度场下降和坝体温度受气温年周期性变化影响两个方面,采用有限单元法分析温度变化对大坝水平位移变形的影响幅度。计算与实测水平位移成果表明,坝体温度下降至稳定温度场过程对上下游向水平位移影响幅度为2 mm左右,气温年周期性变化对坝体下游面温度影响幅度为6℃~8℃时,水平位移影响幅度在1 mm以内。

Taking the 7th section of a RCC dam as an example, the paper analyzes the influence of temperature variation on dam horizontal displacement by f inite element method in terms of the drop o f dam temperature field and the impact of a ir temperature annual periodical variation on dam body temperature. The calculated and measured results indicate that the horizontal displacement is about 2mm from the upstream to downstream direction when the dam temperature drops to a stable temperature field , and the horizontal displacement is less than 1mm when the impact o f a ir temperature annual periodical variation on the temperature of dam body at downstream surface is in the range of 6℃-8℃.