我国目前的堤防大多未做基础处理，堤身多为培土而成，堤后坑溏密布，洪水期间经常发生管涌、滑坡、崩岸和漫溢等险情，严重导致大堤溃决．１９９８年的特大洪水，导致长江沿岸干堤出现险情６０００余处，其中由渗透破坏造成的险情占险情总数的７０％，要根治治水患，达到长治? Most of the current embankments in our country have not been dealt with basically. The embankments are mostly made of earthwork. The dikes are densely covered with pits. The frequent occurrence of potholes, landslides, collapsing and overflowing floods during the floods have seriously damaged the levee. The extraordinary flood in 1998 caused more than 6,000 dangerous dry-embankments along the Yangtze River. In particular, the dangerous situation caused by the infiltration and destruction accounted for 70% of the total number of dangerous situations, so as to cure floods and achieve Changzhi?