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针对防渗墙在施工和运行过程中可能出现裂缝,高压渗水对坝基渗透稳定性造成影响的问题,以新疆大河沿水库工程为例,应用渗流有限元法,建立坝址区三维有限元模型,研究了防渗墙裂缝型式和裂缝宽度对坝基渗流场的影响,并分析了裂缝出现后土体渗透破坏的范围。计算结果表明,防渗墙完好情况下,坝基渗透稳定满足要求;防渗墙出现裂缝时,坝基土体可能会发生渗透破坏,并且上部横向裂缝比竖向裂缝对坝基渗流场影响更大,同时裂缝宽度也会对坝基渗透破坏范围产生较大影响。
In view of the possible cracks and high pressure water seepage on the seepage stability of the dam foundation during the construction and operation, taking the Daheyan Reservoir project in Xinjiang as an example, a three-dimensional finite element model of the dam site is established by using the seepage finite element method. The effect of the crack pattern and the width of the crack on the seepage field of the dam foundation is studied, and the range of seepage failure of the soil after the crack is analyzed. The results show that under the condition of impervious wall, the seepage stability of dam foundation can meet the requirements. When there is a crack in the seepage-proof wall, the seepage damage may occur to the dam foundation, and the upper transverse crack has a greater influence on the seepage field of the dam foundation than the vertical crack. Crack width will also have a greater impact on the dam foundation seepage damage range.