摘要： 结合新疆下坂地水库工程，采用有限元数值模拟计算的方法，研究分析深厚砂砾石地基墙幕结合防渗体系深度变化对坝基渗流的影响规律，探索出深厚砂砾石地基墙幕结合防渗体中防渗墙深度存在一个最优深度，并非越深越好，对深厚砂砾石地基防渗体系的设计和施工具有参考作用。

Abstract: Combined with Xiabandi project in Xinjiang province, FEM numerical simulation was adopted to analyse the influence of the depth of combination of wall and curtain on seepage at deep and thick sand and gravel foundation. The result showed that optimal depth existed, worthy more research in design and construction.