The gravelly soil is a better kind of damming material . it ' s usually used as impervious core and also as dam shell 砾质上是一种良好的筑坝材料，既能作防渗材料，又能填筑坝壳。
2.
2 ) duncan e - u model is applied to the material of the dam . the feasibility of using duncan model is discussed . the duncan e ~ u model which considers the creep character of asphaltic concrete is adopted 坝壳材料选用邓肯e -模型；讨论沥青混凝土心墙材料选用邓肯模型的可行性，最终采用考虑沥青混凝土蠕变特性的改进邓肯模型。
