Numerical analysis of optimization of revetment structures of soil bank slopes of inland rivers

The revetment structure can reduce the damage of soil bank slopes caused by water erosion, but its influences on the physical and mechanical processes such as seepage and deformation of the existing bank slopes should be fully considered in practice. Taking Xinmeng River extension project as the prototype, the influences of the revetment structure with clay on the seepage characteristics and stability of bank slopes are analyzed by the fluid-solid coupling finite element method. The calculated results show that when the clay slope is selected as the revetment form in the high water level area, the phenomenon of "lateral seepage" is likely to occur around the revetment structure. However, there is a hidden danger of seepage failure in the low water level area. Meanwhile, the safety factor of slope decreases due to the increase of local seepage force. In view of the unfavorable factors of the revetment structure with clay, numerical calculations are performed to further optimize the revetment structure with clay. Adding bagged gravel foot protection to the revetment structure of clay bank slope can effectively reduce the velocity in the clay slope layer and the local permeability of the slope surface. Setting up lateral drainage pipes on the revetment structure of slope in the clay-encrusted bank can improve the long-term stability of the bank slope.