建国30多年来水利水电工程建设的经验表明,在所有类型的复杂地基中,含缓倾角软弱层(带)的地基最为常见,而又难于勘察。据不完全统计,建国以来兴建和即将兴建的100余座大型水坝,地基中含平缓软弱层(带)的有近100座,成为勘测设计中突出问题的有30余座,由此而延长勘测设 Experiences of water conservancy and hydropower projects since the founding of the People’s Republic more than 30 years have shown that the foundations with gently inclined weak layers (straps) are the most common and difficult to survey in all types of complex foundations. According to incomplete statistics, about 100 large dams, which have been built and are about to be built since the founding of the People’s Republic of China, have nearly 100 seats with gently weak layers (belts) in the foundation, which have caused over 30 surveys and design problems, thus prolonging the survey Assume