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Structure and Infrastructure Engineering
Maintenance, Management, Life-Cycle Design and Performance
Volume 11, 2015 - Issue 10
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Articles

System reliability analysis for anchor-stabilised slopes considering stochastic corrosion of anchors

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Pages 1294-1305 | Received 24 Mar 2014, Accepted 20 Jul 2014, Published online: 09 Oct 2014
 

Abstract

In this paper, a methodology using Monte Carlo simulation method was developed in conjunction with the modified limiting equilibrium method of slices. Additionally, the time-dependent deterioration of bond capacity of corroding soil anchors was developed in this methodology due to the attack of chlorides. Uncertainties of anchor-related variables and soil parameters were considered using pertinent statistical descriptors. Furthermore, the inherent stochastic nature of the corrosion and degradation process for the anchor/slope system was identified and incorporated in the simulation. A PC-based software, C-UASLOPE, has been coded to allow for handling of complex slope geometry, soil profile and groundwater conditions. An illustrative example was presented to clarify the application of the C-UASLOPE software in modelling the deterioration process to aid in determining the system reliability. The importance of using a system reliability-based algorithm was illustrated by showing that the anchor/slope system may fail unpredictably during design life – even though the initial design results have a high degree of safety – if uncertainties of soil parameters, anchor force and the time-dependent stochastic corrosion process are not accounted for systematically.

Notes

Additional information

Funding

The support of the 111 Project [grant number B13024] is gratefully acknowledged.

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