大西沟水库的安全直接关系到下游乌拉泊水库和乌鲁木齐市的安全，为此对大西沟水库沥青心墙坝进行了三维稳定渗流计算分析，结果表明：①F126，F130等组断层穿过心墙坝基，对渗流场的影响较大，使通过坝基的渗流量增大，心墙底部渗透坡降也增大，这将加大渗流对心墙底部的冲刷，因此，心墙底部断层处，防渗处理非常重要。②灌浆帷幕的渗透性与所在岩基的渗透性相差不大，灌浆帷幕的防渗作用不明显，两岸用延伸帷幕灌浆长度来增加防渗效果不明显；同样心墙底宽的灌浆帷幕的防渗效果也不明显，而心墙底宽的大小却对心墙底部渗流场的影响变得明显。

For the safety of Daxigou Reservoir is directly related to the safty of Wulabo Reservoir downstream and Wulumuqi City, a 3-D steady seepage analysis on Daxigou Dam asphalt core well was conducted. Following conclusions were achieved： ① Fault F126 and Fault F130 pass through the foundation of asphalt core. These faults have significant impacts on the distribution of seepage field. The seepage through dam foundation and the seepage gradient under the core will be increased. Thus the erosion of the base of the core wall could be great. It is very important to control the seepage through the faults. ② Owing to the difference of permeability between grout curtain and rock foundation is not much, there is no significant effect for seepage control by extending the length of grout curtain. For the same reason, the effects of grout curtain under the core are also small. But the computation results show that the seepage field under the core wall is greatly affected by the width of the core wall.