Damage – Permeability analysis of pretensioned spun high strength concrete pipe piles based on stochastic damage model

•A new damage – permeability coupling model of concrete is proposed in the framework of stochastic damage model.•The proposed model is verified to be able to accurately predict the permeability of damaged concrete by comparison to experimental results.•The proposed model is applied in the damage – permeability analysis of pretensioned spun high strength concrete pipe piles considering pile-driving load.•Based on the simulation, the permeability of damaged pretensioned spun high strength concrete pipe pile is increased by around 1000 times than the undamaged pile which will cause an early durability failure of the pile. In off-shore zones, the pretensioned spun high strength concrete (PHC) pipe piles are widely applied for its ability to provide high permeability resistance. However, one of the most applied pile-driving method of the PHC pipe piles is the hammer pile-driving method, and the piles are usually damaged due to the cyclical impact from the hammer. The damage in concrete will remarkably increase the permeability of the material, which will cause an early durability failure in the piles. By this means, a model that comprehensively relates the damage and permeability is firstly proposed under the framework of stochastic damage model in this study. By comparison to the experimental results, the proposed model is verified for its accuracy. And based on the proposed model, the engineering problem of damage - permeability performance of the PHC pipe piles of a construction site in Guangdong province is evaluated.