胶凝砂砾石坝的典型剖面是上、下游坝坡对称的梯形，断面大，应力水平低，经济环保，安全性高，对地基适应性强。目前，对软岩基上修建胶凝砂砾石坝的研究较多，而对于修建于覆盖层上的情况十分少见。贵州省惠水拦河坝工程为修建于覆盖层上的胶凝砂砾石坝。本文以此为例，建立二维有限元模型，计算分析防渗帷幕方案和截水墙方案的渗流场，坝基和坝体的应力变形特征及滑动面抗滑稳定性，进而探讨覆盖层上修建胶凝砂砾石坝的可行性。计算分析得出：两种方案的防渗效果良好，满足渗透稳定性要求，覆盖层坝基的沉降、应力都较小，变化均匀，满足承载力要求，坝体应力水平低，滑动面满足抗滑稳定要求。因此，覆盖层上修建胶凝砂砾石坝具有一定可行性，且综合考虑安全性和经济因素，防渗帷幕方案更具实用性。

The typical profile of hardfill dam is the trapezoid with symmetrical upstream and downstream slopes. The dam has a large section with low stress level, economic and environmental protection, high safety and strong adaptability to the foundation. At present, there are many researches on the hardfill dam on soft rock foundation, but it is rare to study on it on overburden layer. The Huishui Barrage Engineering in Guizhou Province is a hardfill dam built on overburden layer. In order to analyze the feasibility of building hardfill dam on overburden layer, taking this engineering as an example, we established two 2D finite element models of anti-seepage curtain scheme and water cut-off wall scheme to calculate and analyze the seepage field, the stress and deformation characteristics of the dam foundation and the dam body and anti-sliding stability of sliding surface. The results demonstrate that they have good anti-seepage effect and meet the requirements of seepage stability, and that their settlement and stress of dam foundation are small and uniform, meeting the bearing capacity requirements of overburden layer. The stress level of both dams is low. And the sliding surfaces meet the requirement of anti-sliding stability. Therefore, it is feasible to construct a hardfill dam on overburden layer. And considering the safety and economic factors, the anti-seepage curtain scheme is more practical.