Numerical Simulation of Deformation Characteristics of Hydraulic Pipeline Protection Retaining Wall in River Bend under Flood Scouring

Pipeline protection retaining wall, as a main type of hydraulic protection projects, is sometimes destroyed by flood scour, causing local or overall deformation and the acceleration of destruction of hydraulic retaining wall along river bend. It poses a great threat to the normal operation of pipeline. Based on the structure characteristics and the damage form of hydraulic retaining wall in long distance transportation pipeline along river bend under flood scouring, this article presents a numerical model of the retaining wall and analyzes the deformation characteristics in flood period, especially the influence of riverbed lateral widening depth, the water level changing and the flow rate of flood. The results of the study show that the silt shears failure when the flood scouring forced is greater than silt shear force, causing the basal silt incision and scouring. There is a positive correlation between the deformation characteristics of retaining wall and the dropping amplitude of flood water level. Compared with the rising flood period, the retaining wall is more likely to overturn. Lateral widening depth and the falling amplitude of flood are the main parameters to the anti-overturning stability of wall. Improving the retaining wall drainage ability and strengthening the foundation protection of retaining wall are effective measures to alleviate the deformation of hydraulic retaining wall.