中文摘要：

某高心墙堆石坝的心墙发生渗漏后，设计人员考虑在心墙内沿坝轴线方向增设一道塑性混凝土防渗墙进行防渗加固。对加固后的坝体及防渗墙进行了三维有限元计算，分析实际加固施工和蓄水过程中坝体及防渗墙的应力应变特性以及墙体与相邻土料的变形协调情况。计算结果表明，水位变化使防渗墙产生顺河向水平挠度，是引起坝体及防渗墙变形的主要原因，但对坝体的应力影响不大；坝轴线中部的防渗墙是薄弱环节，设计时应加强其抗弯性能；防渗墙与相邻心墙土料的相对位移值在允许范围内。

英文摘要：

When seepage is found in the core wall of a high rockfill dam, a new modified design is proposed to supplement a concrete cutoff wall in the core wall for reinforcement. The 3D FEM calculation was performed for the dam and cutoff wall to sim-ulate the stress and deformation characteristics as well as deformation compatibility between cutoff wall and the adjacent clay un-der reinforcement construction and water impoundment process. The results show that deformation of the cutoff wall and dam body is mainly caused by the rise of water level, a certain horizontal deflection of cutoff wall along river flow direction is found, never-theless, stress of the dam body is not influenced obviously. The middle part of cutoff wall along dam axis is the weakest link and its bending capacity should be improved. The relative displacement between cutoff wall and adjacent clay is within the permissible range.