深覆盖层上面板堆石坝的防渗结构形式及其应力变形特性

对于深覆盖层上的面板堆石坝，采用将趾板直接置于覆盖层地基上的垂直防渗方式是一种较为合适的设计方案。本文通过数值计算分析了这种结构形式的新疆察汗乌苏和甘肃九甸峡面板堆石坝的应力变形特性，通过对坝基防渗墙与趾板不同连接方式的对比分析，可以看出，采用柔性连接形式较好。但在工程实际应用中应注意对防渗墙与连接板之间沉降差异的处理。另外，连接板的长度也需进行合理的优化设计。

Study on seepage blocking structure in CFRD built on deep alluvium foundation

The stress-strain characteristic of two typical CFRD built on deep alluvium foundation is analyzed by using numerical method. The interaction between dam and alluvium foundation as well as the shape of seepage blocking structure are investigated. The comparison of different shapes of structure linking the diaphragm wall with toe slab shows that the structure with flexible performance is in favor of the structure to adapt to the large subsidence difference between diaphragm wall and toe slab, so that the deformation distribution of the dam can be improved. Besides, the length of linking slab must be optimized to improve the stress of the diaphragm wall.