The construction and quality inspection method for large size gravel columns reinforcing the very soft river slope are introduced.

In well—developed cities or densely populated areas,protection of river slope isgenerally choose masonry, dry masonry or concrete revetment measures.

The river slope environment was deteriorated by the ruin of the river slope.

According to the blasting of cement mortar model experiment of the open-air rock bench including a weak interlayer, measured by acoustic waves test,blasting experiment and shear test,this paper studies the stability effect rule of the single hole blasting in the rock slope including a weak interlayer.

Destruction type of river bank slope and control measure;