土石坝防渗墙特性参数对坝体稳定性影响分析

Analysis of Influence of Characteristic Parameters of Cutoff Wall on Earth-rock Da Stability

为分析防渗墙特征参数对大坝稳定性的影响,基于数值模拟研究了防渗墙弹性模量、厚度及位置对坝体变形和内力的影响,结果表明:当混凝土防渗墙的弹性模量为15 GPa时,坝体位移随高程的增大而增加,混凝土防渗墙以受压为主,当混凝土弹性模量为15~25 GPa时,坝体是安全的;坝体第一主应力和第三主应力随高程变化表现出波动变化趋势。随防渗墙的厚度越大,第三主应力的绝对值越小,大坝越安全;防渗墙距上游坝顶距离越小,第三主应力绝对值越小,压应力越小,防渗墙越稳定。

In order to analyze the influence of characteristic parameters of cutoff wall on dam stability,the influence of elastic modulus,thickness and position of cutoff wall on dam deformation and internal force is studied based on numerical simulation.The results show that,when the elastic modulus of the concrete cutoff wall is 15 GPa,the displacement of the dam body increases with the increase of elevation,and the concrete cutoff wall is mainly under pressure.When the elastic modulus of concrete is 15~25 GPa,the dam body is safe.The first and the third principal stress of the dam body fluctuate with the elevation.The greater the thickness of the cutoff wall,the smaller the absolute value of the third principal stress,and the safer the dam.The smaller the distance between the cutoff wall and the upstream dam crest,the smaller the absolute value of the third principal stress,and smaller the compressive stress,and the more stable the cutoff wall.