Sensitivity analysis of the influences of mortar aging and loss on the structural performance of masonry arch aqueducts

As commonly used canal system structures, masonry arch aqueducts constitute a significant proportion of Chinese old irrigation infrastructures. Most these existing are well over 50 years old, the deterioration their constituent materials time, as development other defects, significantly affects mechanical responses structures. A deep understanding on dominant factors that influence structural safety behaviour is essential for determining maintenance and strengthening strategies. Taken Zhaimen aqueduct in famous Red Flag Canal case study, sensitivity analyses influences mortar aging loss performance were carried out. The aqueduct, with unknown geometric dimensions uncertain physical parameters, has defects such ring detaching from upper structure continuous falling mortar. discrete element method (DEM) was employed to analyse behaviour. results show supporting stable under no bond strength condition. When lost locally, vault position most dangerous, followed by shoulder, then foot part. loss, manifested denseness reduction, greatly stability. Conversely, properties mortar, caused weathering Calcium ion dissolution due ambient environment leakage, relatively little impact safety. Supplementary grouting between stone should be timely out maintain integrity ensure overall stability structure. proposed approach can provide reference diagnosis assessment similar