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PROBABILISTIC ANALYSIS OF TWO MECHANISMS OF FAILURE IN GEOSYNTHETIC REINFORCED SLOPES USING MONTE CARLO SIMULATION
Session: Uncertainty, Reliability, and Risk / Incertitude, fiabilité, et risque
Sina Javankhoshdel, Queen's University, (Canada)
Richard J. Bathurst, Royal Military College of Canada (Canada)
Reinforced slopes with horizontal layers of geosynthetic reinforcement can have different mechanisms of failure. In this paper two major mechanisms of failure of reinforced slopes are investigated. An external mechanism occurs when the critical slip surface passes beyond the reinforced zone. Internal mechanisms are characterized by failure surfaces that intersect all of the reinforcement layers. For a target value of the factor of safety, and a specific value of the reinforcement length, there is a minimum value of the reinforcement tensile strength to generate only external mechanism types. On the other hand, increasing the reinforcement length generates an internal mechanism type. In this study, probabilistic slope stability analysis of these two mechanisms is carried out using Monte Carlo simulation of slopes with different purely frictional soils and slope angles. For a target value of the factor of safety, two sets of charts for external and internal failure mechanism types are presented that can be used to calculate probability of failure for simple slopes with purely frictional soils.
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