1. The clay minerals in 65 surface sediment samples from the Changjiang River subaqueous delta were analyzed by using X ray diffraction (XRD) analysis technique. 采用X射线衍射（XRD）分析技术分析了长江水下三角洲地区65个表层沉积物样品的粘土矿物。
2. Distributary channel was well developed, prodelta was relatively not well developed and delta front was dominated by subaqueous distributary channel deposits. 研究区三角洲平原分流河道沉积极为发育，前三角洲相对不发育，三角洲前缘也以水下分流河道沉积为主。
3. The application scheme of the artificial freezing method in Xuanwu Lake subaqueous highway tunnel construction and the constructing procedure of the freezing method are introduced. 介绍了人工冻结法在玄武湖水下交通隧道中的应用方案以及冻结法的施工工艺。
