序言第四纪沉积物在地表上比起其他时代的地层来是分布最广的,尤其在平原地区,例如河北、准河、松辽等大平原内都有广大面积和厚度很大的第四纪沉积物的分布。在这样的地区进行水利工程建筑时,无疑地,建筑物的地基在大多数情况下是第四纪的松软岩层。由于第四纪沉积物的形成历史和过程与其他的地质时代的岩层有着很大的区别,因而它们的物理一技术性质也就显著的不同于其他的岩层,这一点就更 Preface Quaternary sediments are the most widely distributed on the earth’s surface than in other epochs, especially in plains such as Hebei, Zhunhe, Songliao and other large plains. Sediment distribution. When building water conservancy projects in such areas, it is clear that the foundations of buildings are, in most cases, Quaternary soft rock formations. Since the history and process of the formation of Quaternary sediments are quite different from those of other geological formations, their physical-technical properties are significantly different from those of other rock formations