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建立黄河山坪电站船闸地基的有限元模型,采用有限单元法研究三维渗流场,对计算得到的水头、扬压力、渗透坡降以及渗透体积力等进行分析.针对防渗墙的防渗作用,讨论墙厚及墙体嵌入基岩深度的敏感性,为防渗墙优化设计提供参考.结果表明:设置防渗墙后,有效地降低了闸底板的扬压力,提高了地基的渗透稳定性;墙厚的变化,对墙体的渗透坡降有较大影响;墙底基岩的渗透坡降随墙体嵌入深度的增大而减小;设计院采用的防渗墙厚度60cm、嵌入基岩深度1m的方案是合理且经济的.此外,通过三维渗流场分析得到的渗透体积力,可为进一步研究地基应力、沉降变形、抗滑稳定以及在地震作用下含泥粉细砂可能发生的震动液化提供渗流荷载依据.
The finite element method is used to study the three-dimensional seepage field, and the calculated head, uplift pressure, seepage gradient and seepage volume force are analyzed.Aiming at the impermeability of the seepage-proof wall, The sensitivity of the wall thickness and the depth of the bedrock embedded in the bedrock is discussed, which provides a reference for the design of the cutoff wall.The results show that after the cutoff wall is set, the uplift pressure of the sluice floor is effectively reduced and the seepage stability of the foundation is improved; The change of wall thickness has a great influence on the slope infiltration of the wall. The infiltration slope of the bedrock decreases with the increase of the embedded depth of the wall. The thickness of the cut-off wall used in the design institute is 60cm, In addition, through the three-dimensional seepage flow field analysis of the permeate volume force, for further study of the foundation stress, settlement deformation, anti-skid stability and under the action of earthquakes with silt sand may occur vibration Liquefaction to provide seepage load basis.