黑宗面板坝以天然砂砾石为主要筑坝材料，建于高海拔、高地震度、深覆盖层上，是国内在建100m级高坝之一。砂砾石便于开采、施工、造价低廉，且具有远高于堆石的变形模量。因此，砂砾石逐渐被选作高面板坝的筑坝材料、但天然砂砾石分布不均，具离散性，易受冲蚀，用其筑坝与用耐冲蚀堆石料填筑的面板坝有很大不同。砂砾石面板坝渗流控制十分重要，应将其放在首位，这是坝体设计的关键所在。 The black sand dam mainly uses natural sand and gravel as the dam material. Built on high altitude, high seismicity and deep overburden, it is one of the 100m high dam under construction in China. Gravel is easy to mine, construction, low cost, and has a much higher deformation modulus than rockfill. As a result, gravel was gradually selected as the dam material for high-panel dams. However, the natural gravel was unevenly distributed and disperse and easily eroded. The dams used for dam construction and filled with erosion-resistant rockfill material were Very different. Sand gravel dam seepage control is very important, it should be placed in the first place, which is the key to the dam design.