摘要
采用有限元法,对斜卡水电站面板堆石坝进行了三维渗流计算分析,讨论了面板、防渗墙出现裂缝及帷幕灌浆劣化、帷幕减薄对三维渗流场分布和渗流量的影响。计算结果表明,由于斜卡坝址覆盖层深厚（45~100 m）,加之基岩渗透性强,防渗墙和帷幕上下游水头差大,正常运行方案渗流量可达0.642 m3/s。面板和防渗墙出现裂缝对大坝整体渗流场影响较小,而通过坝面和防渗墙的流量显著增大;帷幕劣化或变薄使坝基渗流量明显增加。加厚帷幕和减小其渗透系数是加强防渗效果的有效措施。
The article makes 3D seepage study for the face rockfill dam of Xieka Hydropower Station through finite element method,and discusses the impact of cracked concrete face and cracked anti-seepage wall,curtain grouting deterioration and curtain thinning on 3D seepage field and seepage flow.Results show that the seepage flow may reach 0.642m3/s in normal operation program because of thick overburden layer（45～100m） at dam site,strong permeability of bedrock,large water head difference between the upstream and the downstream of anti-seepage wall and curtain.Cracks on concrete face and anti-seepage wall affect the 3D seepage field little,but the seepage flow through the face and the wall increases a lot;deterioration or thinning of curtain makes seepage at dam foundation increase significantly.Therefore,to thicken the curtain and reduce its permeability may improve the anti-seepage effect.
出处
《红水河》
2010年第5期43-46,67,共5页
Hongshui River
关键词
面板堆石坝
渗流
深覆盖层
裂缝
斜卡水电站
face rockfill dam
seepage
thick overburden layer
crack
Xieka Hydropower Station
