金佛山沥青混凝土心墙坝二维渗流计算分析

Calculation and Analysis of Two-Dimension Seepage in Jinfoshan Asphalt Concrete Core Wall Dam

渗透水流将会对土石坝的坝体以及坝基渗透破坏产生巨大的危害性。本文依托金佛山水电站工程,根据沥青混凝土心墙堆石坝方案的地质条件及渗流控制特点,建立了平面有限元计算分析模型,模拟了坝体和坝基在不同水位组合条件下的渗流场,重点研究了其渗透破坏的可能性,并且对防渗帷幕和坝基渗透系数的敏感性进行了分析。计算分析结果表明:各种水位组合下,沥青混凝土心墙及防渗帷幕起主要的阻水作用,防渗帷幕的水力比降较大,其安全稳定性需要重视。渗流场分布对防渗帷幕及坝基渗透系数不敏感,而渗流流量相对敏感。

Infiltration water has very big influence on seepage damage of earth and rockfill dam. According to the geological conditions and seepage control characteristic of Jinfoshan asphalt concrete core wall dam, we estab- lished a 2-D finite element calculation model to simulate the seepage field in different water level combination, espe- cially focus on the possibility of seepage failure, and analyze the sensitivity of impervious curtain and dam foundation ＇ s osmotic coefficient. The calculation results show that the asphalt concrete core wall and impervious curtain are the major resistance to water, impervious curtain has big hydraulic gradient and we need pay more attention to it. The seepage field distribution has little sensibility with the change of impervious curtain and dam foundation＇ s osmotic co- efficient, but the seepage flow is sensitive.