Abstract: To meet the requirements of foundation bearing capacity and structural settlement, normally, adjustment of the structural shape and reinforcement of foundation are adopted. If the overburden layer is shallow, concrete replacement is easier and economical. The sluice height of Shaping II hydropower station from bottom to top is 29 m, and the thickness of riverbed overburden is 4~38 m, which is in the middle level and is equivalent to the height of sluice. Therefore, the foundation treatment method needs to be compared and selected carefully. In this paper, the concrete replacement scheme and the construction on overburden scheme are drawn up and compared from the aspects of structural reliability, construction conditions and project investment, for reference.

Key words: sluice, foundation treatment, overburden, concrete replacement, Shaping II hydropower station

摘要： 在深厚覆盖层上建闸坝一般采取调整结构体型及进行基础加固处理方式以满足基础承载力及结构沉降要求，如覆盖层较浅，一般采取混凝土置换方式较为经济简单。沙坪二级水电站泄洪闸从闸底板顶部至闸顶29 m，其河床冲洪积覆盖层厚度4~38 m，处于中等水平且与泄洪闸高度相当，因此，需要对基础处理方式选择进行比选研究。笔者拟定了混凝土置换方案、覆盖层建坝方案并从结构可靠性、施工条件、工程投资等方面进行了比选研究，旨在为类似工程提供借鉴。

关键词: 泄洪闸, 基础处理, 覆盖层, 混凝土置换, 沙坪二级水电站