黏土心墙坝加固中混凝土防渗墙应力变形研究

Stress and Deformation Research on Concrete Cutoff Wall of Clay Core Earth-Rock Fill Dam Reinforcement

结合某病险黏土心墙土石坝加固所采用的混凝土防渗墙方案,分别按普通刚性墙和三种不同弹性模量塑性墙进行了典型剖面数值模拟,分析了土石坝加固中混凝土防渗墙以及坝体应力变形规律,比较了塑性墙和刚性墙的性能差别,以及塑性混凝土材料对防渗墙应力变形的影响。结果表明:塑性墙的应力分布均匀且压应力、拉应力、剪应力均远小于刚性墙的,塑性墙与坝体的变形协调性良好,而刚性墙与坝体变形相差较大、增加了墙体应力,塑性混凝土防渗墙在应力变形方面明显优于刚性混凝土防渗墙。

Based on the concrete cutoff wall schemes in a reinforced unsafe clay core earth-rock fill dam, the typical section was calculatedwith numerical simulation method. In this paper, it studied the stress and deformation variation of concrete cutoff wall and dam, compared theperformance differences of the three different elastic modulus plastic walls with the rigid wall and the impact of the plastic concrete cutoff wallmaterial on stress and deformation. The results indicate that the stress distribution of plastic wall is homogeneous and the compression stress,tensile stress, shearing strength are all much less than that of rigid wall; the deformation between plastic wall and dam body is wellcoordinated, the deformation between rigid wall and dam body is large which increases the wall stress. The stress and deformationcharacteristic of plastic concrete wall are much better than that of rigid concrete wall.