A Resilience Model for Engineered Slopes Subject to Anchor Corrosion

• Published in: KSCE journal of civil engineering Vol. 22; no. 3; pp. 887 - 895
• Main Authors: Li, Xue-You, Fan, Zeng-Bin, Lu, Tao, Xiao, Te, Zhang, Li-Min
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 01.03.2018; Springer Nature B.V; 대한토목학회
• Subjects: Anchors; Business metrics; Civil Engineering; Corrosion; Decision analysis; Decision making; Duration; Economic conditions; Effectiveness; Engineering; Engineers; Environmental engineering; Failure; Geotechnical Engineering & Applied Earth Sciences; Highway construction; Industrial Pollution Prevention; Inspection; Maintenance; Performance evaluation; Probabilistic Learning for Decision-making on Civil Infrastructures; Probability theory; Repair; Repair & maintenance; Resilience; Service life; Slope; Slope stability; 토목공학; risk management; corrosion; reliability analysis; decision; resilience; slope stability
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-018-1041-3

Many high engineered slopes are stabilized using anchors, which may corrode over time. Proper maintenance is essential to recover the system performance and upkeep slope functions. This paper presents a resilience model for maintenance decision by analysing the degradation of an anchor-stabilized slope due to corrosion and evaluating the recovery of slope performance after maintenance. Failure probability is used as an indicator to characterize the evolution of slope performance within its service life. The timing for maintenance is determined when the failure probability reaches an intolerable value. Information obtained from regular inspections is used to reduce the uncertainty in the determined maintenance time. The effectiveness of possible repair schemes is measured by a resilience index for the slope attained after maintenance, which considers the reduction in the failure probability and the duration over which the failure probability remains acceptable. A benefit index, which incorporates both the effectiveness and cost of a repair measure, is defined and used to quantitatively evaluate possible maintenance schemes. The proposed model is illustrated using an anchor-stabilized rock slope example, which provides a means to quantitatively assess different repair measures and enables engineers to select an effective and economic measure for slope maintenance.