回顾了长江科学院自建院以来在南水北调中线工程膨胀土问题中所开展的研究工作，系统总结了长江科学院在膨胀土理论和试验技术方面所取得的主要成果。重点介绍了“十一五”期间长江科学院围绕国家科技支撑课题“膨胀土地段渠道破坏机理及处理技术研究”所开展的研究工作，以及在膨胀土渠坡破坏机理、膨胀土现场快速判别、膨胀土强度指标试验方法、渠坡处理措施等方面取得的最新研究成果。

Researches conducted by Changjiang/Yangtze River Scientific Research Institute on expansive soil in the middle route of South-to-North Water Diversion Project are reviewed, and the main achievements on the theory and test technology in this regard are summarized. In particular, research works related to the failure mechanism and treatment technology of canal in expansive soil regions supported by National Key Technology R&D Program are presented in details, and the latest achievements on expansive soil inclusive of the failure mechanism, rapid identification, shear strength tests, and treatment measures of expansive soil canal slope are introduced.