八角庙水库主坝加固渗流稳定分析

Seepage Stability Analysis for Main Dam of Bajiaomiao Reservoir after Reinforcement

八角庙水库运行40多年来,主坝出现多处隐患。根据地质勘查的结果对坝体进行加固,通过对坝体加固前后有限元渗流和稳定分析结果可知,加固前心墙下游与坝壳料接触面比降很大,单宽流量几乎达到30 m3/（d.m）,下游坝坡在任意一种工况下,安全系数均大于规范值。加固后坝体的单宽流量大大减少,下游坝壳土水平比降降低,防渗效果明显增强。上下游坝坡均处于安全状态。

After working more than 40 years of Bajiaomiao Reservoir,the main dam has many hidden troubles.The dam has been reinforced according to its geological exploration results.Through the finite element analyses for seepage and stability of the dam before and after reinforcement,the conclusions are reached here： before reinforcement,the gradient ratio of contact surface between the downstream of core and the dam shell is large,the discharge per unit width is almost up to 30 m3/（d·m）,the safety factors of downstream dam are greater than code values at any working conditions;after reinforcement,the discharge per unit width of the dam is greatly reduced,the horizontal gradient ratio of downstream dam shell is decreased,the anti-seepage effect is enhanced markedly.All the upstream slope and downstream slope come to a safe state.