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Smart Structures and Systems Volume 7, Number 4, April 2011 , pages 263-274 DOI: https://doi.org/10.12989/sss.2011.7.4.263 |
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Real-time unsaturated slope reliability assessmentconsidering variations in monitored matric suction |
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Jung Chan Choi, Seung Rae Lee, Yunki Kim and Young Hoon Song
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| Abstract | ||
| A reliability-based slope stability assessment method considering fluctuations in the monitored matric suction was proposed for real-time identification of slope risk. The assessment model was based on the limit equilibrium model for infinite slope failure. The first-order reliability method (FORM) was adopted to calculate the probability of slope failure, and results of the model were compared with Monte-Carlo Simulation (MCS) results to validate the accuracy and efficiency of the model. The analysis shows that a model based on Advanced First-Order Reliability Method (AFORM) generates results that are in relatively good agreement with those of the MCS, using a relatively small number of function calls. The contribution of random variables to the slope reliability index was also examined using sensitivity analysis. The results of sensitivity analysis indicate that the effective cohesion c\' is a significant variable at low values of mean matric suction, whereasmatric suction (ua-uw) is the most influential factor at high mean suction values. Finally, the reliability indices of an unsaturated model soil slope, which was monitored by a wireless matric suction measurement system, were illustrated as 2D images using the suggested probabilistic model. | ||
| Key Words | ||
| unsaturated soil slope; reliability analysis; real-time monitoring. | ||
| Address | ||
| Jung Chan Choi and Seung Rae Lee : Department of Civil and Environmental Engineering, KAIST, Daejeon 305-701, Republic of Korea Yunki Kim : Civil ENG Team, Samsung C&T Corp. 137-857, Republic of Korea Young Hoon Song : Hyundai Engineering & Construction Co., LTD. Gyeonggi-Do 446-716, Republic of Korea | ||