Developing a Risk Matrix for Assessing Seismic Vulnerability of CIPP Rehabilitation of Water Pipelines

Abstract

This study developed a comprehensive seismic risk matrix framework to evaluate the vulnerability of aging large-diameter water pipelines along Heping West Road, Taipei, before and after rehabilitation with Cured-in-Place Pipe (CIPP) trenchless technology. The framework integrates detailed pipeline segment attributes, precise working pit geolocations, seismic hazard data (Peak Ground Acceleration, PGA), and soil classifications derived from extensive micro zonation of the Taipei Basin. Segment-level repair rates were estimated using empirically calibrated regression models aligned with ISO 31000 and AS/NZS ISO 31010 standards. Fragility curves quantified damage probabilities under site-specific PGA intensities. The pipeline was divided into three uniform segments of 220 meters each, associated with four working pits, enabling spatially explicit risk assessments. This project embodied a collaborative effort between academic researchers and the Taipei Water Department, merging scientific rigor with practical expertise to create a robust decision support tool for urban pipeline seismic risk management. Results highlight a significant reduction of approximately 90% in expected pipeline failures post-CIPP rehabilitation, with repair rates decreasing from