Off-stability conditions at head of the filling dike are put forward according to factors which may lead to slump of the head dike and applications of the above-mentioned conditions are also introduced.

To determine the bank-head s ice force of the lead-navigating bank at key position that faces the ice directly of certain water conservancy, ice model test in reduced scale is designed and carried out based on the local situation on the spot and data observed.

The rock-fill structure with soil engineering grills occupied progressively is to use rock filling with soil engineering grills and soils filled with geo-textile sacks instead of traditional body occupied progressively with willow stone.