基于有限元法的土石坝除险加固渗流问题分析

Seepage Problem in the Reinforcement of Earth-Rockfill Dam Based on Finite Element Method

摘要:

土石坝坝体在坝前水位作用下极易产生渗流，为研究坝体加固对渗透水压的影响，针对具体水库实例，采用有限元法对除险加固前/后的坝体进行渗透坡降、单宽渗流量、准流网等计算，分析3种工况下的渗流过程，为土石坝的除险加固设计提供参考。结果表明：加固后上游坡各工况下的安全系数明显提高，其中单宽渗流量最大，可达0.636 m³/d，远大于规范允许值。

Abstract:

The earth-rockfill dam body can easily generate seepage when water level is below the dam. To study the influence of the dam body reinforcement on the seepage pressure, a finite element numerical simulation was conducted based on an actual reservoir, under three cases of an earth-rockfill dam before and after reinforcement. Seepage gradients, the discharge per unit width, and quasi drift were obtained. The research results show that the safety factors of upstream slope under the three cases after reinforcement significantly increased, and the discharge per unit width can reach 0.636 m³/d, which is far greater than the standard value.