FEM simulation of deformation and damage rule of cutoff wall under rainfall erosion effect

Cutoff wall is an effective hydraulic structure to protect oil-gas pipeline lying along the slope, for which has a great impact on the safety and stability of oil-gas pipeline when it has been destroyed by rainfall erosion. With a certain pipeline as its engineering background, this study took the structural styles and rainfall-caused damage characteristics of cutoff walls along the pipeline into account. Based on regularity of regional rainfall and soil-erosion specialties of the slope; considering the interaction among the cutoff wall, pipe and soil, and material damage effects of cutoff wall; a numerical model of cutoff wall was constructed. Simulating deformations and interactional effect rules of wall-pipe-soil system under different rainfall conditions; the stress and deformation and damage regularity of cutoff wall were comparatively analyzed. Studies had shown that cutoff wall present characteristics of tensile failure under rainfall erosion effect; Increased with the elevated intensity of rainfall, load was increasing and the damage degree and damage range of cutoff wall were expanding.