坝基混凝土防渗墙损伤开裂数值模拟研究

Numerical Simulation Study on the Damage and Crack Development of Seepage Prevention Walls in Dam Foundations

混凝土防渗墙一旦开裂,对大坝安全会产生较大隐患。为研究坝基混凝土防渗墙开裂特性,分别利用混凝土的Bathe本构模型和D-P Cap模型对仁宗海堆石坝坝基防渗墙进行了数值模拟,结果表明,开裂时间、开裂范围、裂缝扩展过程及裂缝状态等都较为相似,说明防渗墙在坝体施工及水库运行期均有开裂的可能,且裂缝主要以表面裂缝为主,在水库蓄水及水位变化过程中,墙体与两岸连接处可能会出现小范围的贯穿裂缝(主要为右岸)。坝体右岸渗流监测值和现场检查情况在一定程度上佐证了开裂模拟的合理性。该成果可为类似工程参考。

Once concrete seepage prevention walls crack,they pose significant hidden risks to dam safety.To study the cracking characteristics of dam foundation concrete seepage prevention walls,numerical simulations are carried out using the concrete Bathe constitutive model and the D-P Cap model on the Renzonghai rockfill dam’s foundation seepage prevention wall.The results show that the timing of cracking,the range of cracking,the process of crack propagation,and the state of the cracks are quite similar.This suggests that seepage prevention walls are likely to crack both during dam construction and reservoir operation,with cracks primarily appearing on the surface.During the process of reservoir water storage and water level changes,small through-cracks may occur at the junctions of the wall and the banks(mainly on the right bank).The right bank seepage monitoring data and on-site inspection findings to some extent corroborate the rationality of the crack simulation.These findings can serve as a reference for similar engineering projects.