一、前言 在岩基上建坝几乎每个坝址都要遇到不同程度的软弱夹层问题。软弱夹层的渗透变形对坝基和坝肩的稳定性有重要影响。 由于软弱央层的成因和构造的复杂性,使软弱央层的类型复杂,分类标准亦十分繁多。因此,软弱夹层的渗透变形性质也变化较多,加之所要研究的是原状结构的土体, I. INTRODUCTION The construction of dams on rock foundations involves encountering varying degrees of weakness and interlayer problems in almost every dam site. The osmotic deformation of the weak sandwich has an important influence on the stability of the dam foundation and the abutment. Due to the complexity of the causes and structures of the soft and weak central layers, the types of soft and weak central layers are complicated and the classification standards are very numerous. Therefore, the osmotic deformation properties of weak interlayers also change more, and the soil to be studied is the original structure.