This paper established the finite element expression of two-dimensional stable infiltration, made infiltration analysis on an earth-rock dam. The calculation results showed that the infiltration had adverse effect to earth-rock dam stability. After storing water of reservoir, the dam body and dam foundation and surrounding rock of reservoir continued to produce infdtration, the pore water pressure and uplift pressure caused infiltration, could cause infiltration failure, reduce the shearing strength and other phenomenon damage stability of dam body in improper design and construction.%建立了二维稳定渗流的有限元表达,对某土石坝进行了渗流分析,计算结果显示渗流会对土石坝的稳定性带来不利的影响,水库蓄水后,通过土石坝的坝体或坝基以及水库的周围岩体不断地产生渗流,渗流产生的孔隙水压力和扬压力,在设计和施工不当时会造成渗流破坏和降低抗剪强度等有损坝体稳定的现象。
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